From da0819bfa35ae0aebe1a1f246ce0be18b721acce Mon Sep 17 00:00:00 2001
From: Vladimir Rogojin <vrogojin@vrogojin.net>
Date: Mon, 4 May 2026 17:01:25 +0200
Subject: [PATCH 1/5] feat: faucet probe + bump to 0.4.0
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds a sixth probe to the suite for the Unicity test faucet
(https://faucet.unicity.network). Many SDK e2e suites depend on the
faucet for wallet funding (uxf-send-receive, pointer-roundtrip,
migrate-to-profile-conservation, profile-export-roundtrip); when the
faucet is down, those suites silently time out at 240 s with a generic
"Faucet top-up timed out" message. Probing upfront converts that into
a clean 1-2 s SKIP with a precise diagnostic.

The probe issues POST /api/v1/faucet/request with a deliberately-
invalid probe nametag (`infra-probe-do-not-mint-zk7q3xa9p2v`).
Healthy faucet returns HTTP 4xx + structured
`{success: false, error: "Nametag not found: ..."}`. This exercises the
full HTTP/parse/nametag-resolve/response-shaping pipeline WITHOUT
consuming actual faucet quota or requiring a real wallet — the same
"empty cost, full coverage" pattern the aggregator probe uses with its
known-bad shard ID.

Defense-in-depth: if the faucet ever returns success:true for the
probe nametag, the probe DOWNGRADES to 'degraded' (validation may be
broken — the probe nametag is supposed to be invalid).

Network config:
- testnet, dev: faucet = "https://faucet.unicity.network"
- mainnet: faucet = null (no faucet by design)
The probe layer treats null as a clean skip with verdict 'healthy' —
cleaner than emitting a misleading "unreachable" verdict against a
default URL that doesn't apply to the network being probed.

SERVICES expands from 5 to 6: ['nostr', 'aggregator', 'ipfs',
'fulcrum', 'market', 'faucet']. The 'faucet' entry is appended at the
end so existing --only invocations are unaffected.

Tests:
- 21 smoke tests pass (added 1 for mainnet/testnet faucet contract)
- Live testnet probe: 6/6 services healthy
- Live mainnet probe with --only faucet: skipped cleanly with
  "network mainnet has no faucet by design — skipped"
---
 CHANGELOG.md          |  14 +++
 README.md             |   9 +-
 package.json          |   5 +-
 src/index.mjs         |  21 +++-
 src/networks.mjs      |   6 ++
 src/probes/faucet.mjs | 244 ++++++++++++++++++++++++++++++++++++++++++
 tests/smoke.test.mjs  |  18 +++-
 7 files changed, 310 insertions(+), 7 deletions(-)
 create mode 100644 src/probes/faucet.mjs

diff --git a/CHANGELOG.md b/CHANGELOG.md
index eaeed46..8254c52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,20 @@
 
 All notable changes to `@unicitylabs/infra-probe` are documented in this file. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project adheres to [Semantic Versioning](https://semver.org/).
 
+## [0.4.0] — 2026-05-04
+
+### Added
+
+- **`faucet` probe** for the Unicity test faucet (`https://faucet.unicity.network`). The faucet issues real test tokens to e2e wallets identified by registered nametag; many SDK e2e suites (`uxf-send-receive`, `pointer-roundtrip`, `migrate-to-profile-conservation`, `profile-export-roundtrip`) silently time out at the wallet-funding step when the faucet is down. The probe converts a 240 s "Faucet top-up timed out" into a 1-2 s clean SKIP with a precise "faucet unreachable" message.
+  - **`request` check** — POST `/api/v1/faucet/request` with a deliberately-invalid probe nametag. Healthy faucet responds with HTTP 4xx + structured `{success: false, error: "Nametag not found: …"}`. Exercises the full HTTP/parse/nametag-resolve/response-shaping pipeline WITHOUT consuming actual faucet quota.
+  - **`health` check** — best-effort GET `/health`. Absence is not a failure; presence cross-checks backend pressure.
+- **`NETWORKS[*].faucet`** field per network. `null` on mainnet (no faucet by design), `https://faucet.unicity.network` on testnet and dev. The probe layer treats `null` as a clean skip with verdict `healthy` — cleaner than emitting a misleading "unreachable" verdict against a default URL that doesn't apply.
+- **`SERVICES`** updated to 6 entries: `['nostr', 'aggregator', 'ipfs', 'fulcrum', 'market', 'faucet']`. Stable ordering preserved; `faucet` appended at the end so existing `--only` invocations are unaffected.
+
+### Notes
+
+- The probe nametag (`infra-probe-do-not-mint-zk7q3xa9p2v`) is deliberately synthetic and unlikely to collide with a real user's nametag. If the faucet ever returns `success: true` for the probe call (i.e., MINTS tokens to the probe nametag), the verdict downgrades to `degraded` with a clear "validation may be broken" message — that's a real signal worth surfacing.
+
 ## [0.3.0] — 2026-05-03
 
 First publishable release. Three rounds of probe-correctness work since the initial cut, plus documentation and packaging hardening.
diff --git a/README.md b/README.md
index 54c2336..8fa7de1 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 Tiny availability + performance probe for [Unicity Network](https://unicity.network) infrastructure.
 
-Designed as a **pre-flight gate** for end-to-end test suites and a **5-second smoke test** when something feels off. Runs five parallel probes — Nostr relay, L3 Aggregator, IPFS gateway, L1 Fulcrum, and the Market intent database — exercises both the **liveness** of each endpoint and the **functional write+read+verify path** real wallet flows depend on, then reports per-check latency in either a colored human-readable format or single-line JSON.
+Designed as a **pre-flight gate** for end-to-end test suites and a **5-second smoke test** when something feels off. Runs six parallel probes — Nostr relay, L3 Aggregator, IPFS gateway, L1 Fulcrum, the Market intent database, and the test Faucet — exercises both the **liveness** of each endpoint and the **functional write+read+verify path** real wallet flows depend on, then reports per-check latency in either a colored human-readable format or single-line JSON.
 
 ```
 ✅ aggregator   https://goggregator-test.unicity.network
@@ -47,7 +47,12 @@ Designed as a **pre-flight gate** for end-to-end test suites and a **5-second sm
    ✓ feed-recent           1016ms   10 listing(s) returned (1016ms)
    Status: HEALTHY (2/2 checks passed)
 
-  Summary: 5 HEALTHY, 0 DEGRADED, 0 UNREACHABLE  (of 5)
+✅ faucet       https://faucet.unicity.network
+   ✓ request                168ms   cleanly rejected probe-nametag (168ms; "Nametag not found: …")
+   ✓ health                  13ms   HTTP 200 (13ms)
+   Status: HEALTHY (2/2 checks passed)
+
+  Summary: 6 HEALTHY, 0 DEGRADED, 0 UNREACHABLE  (of 6)
 ```
 
 ## Install
diff --git a/package.json b/package.json
index ddc7235..630434c 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@unicitylabs/infra-probe",
-  "version": "0.3.0",
-  "description": "Availability + performance probe for Unicity Network infrastructure (Nostr relay, Aggregator, IPFS gateway, L1 Fulcrum). Pre-flight check for e2e tests; CI-friendly JSON output.",
+  "version": "0.4.0",
+  "description": "Availability + performance probe for Unicity Network infrastructure (Nostr relay, Aggregator, IPFS gateway, L1 Fulcrum, Market, Faucet). Pre-flight check for e2e tests; CI-friendly JSON output.",
   "type": "module",
   "license": "MIT",
   "author": "Unicity Network <https://unicity.network>",
@@ -20,6 +20,7 @@
     "nostr",
     "ipfs",
     "fulcrum",
+    "faucet",
     "monitoring",
     "preflight"
   ],
diff --git a/src/index.mjs b/src/index.mjs
index 756fdb0..cdddd1c 100644
--- a/src/index.mjs
+++ b/src/index.mjs
@@ -14,8 +14,9 @@ import { probeAggregator } from './probes/aggregator.mjs';
 import { probeIpfsGateway } from './probes/ipfs.mjs';
 import { probeFulcrum } from './probes/fulcrum.mjs';
 import { probeMarket } from './probes/market.mjs';
+import { probeFaucet } from './probes/faucet.mjs';
 
-export const SERVICES = ['nostr', 'aggregator', 'ipfs', 'fulcrum', 'market'];
+export const SERVICES = ['nostr', 'aggregator', 'ipfs', 'fulcrum', 'market', 'faucet'];
 
 /**
  * @param {object} options
@@ -41,6 +42,24 @@ export async function runProbes({ network = 'testnet', only, timeoutMs = 20_000,
     ipfs:       () => probeIpfsGateway(cfg.ipfsGateways[0],     { timeoutMs }),
     fulcrum:    () => probeFulcrum(cfg.fulcrum,                 { timeoutMs }),
     market:     () => probeMarket(cfg.marketApi,                { timeoutMs }),
+    // Mainnet has no faucet — `cfg.faucet` is null there. Return a
+    // skipped-cleanly verdict rather than running probeFaucet against
+    // a default URL that doesn't apply to the network being probed.
+    faucet:     () => cfg.faucet
+      ? probeFaucet(cfg.faucet, { timeoutMs })
+      : Promise.resolve({
+          service: 'faucet',
+          endpoint: '(none for ' + network + ')',
+          status: 'healthy',
+          latencyMs: 0,
+          checks: [{
+            name: 'config',
+            status: 'pass',
+            latencyMs: 0,
+            message: `network ${network} has no faucet by design — skipped`,
+          }],
+          timestamp: new Date().toISOString(),
+        }),
   };
 
   const tasks = requested.map((name) => {
diff --git a/src/networks.mjs b/src/networks.mjs
index eff7c74..b020941 100644
--- a/src/networks.mjs
+++ b/src/networks.mjs
@@ -18,6 +18,10 @@ export const NETWORKS = {
     ],
     fulcrum: 'wss://fulcrum.unicity.network:50004',
     marketApi: 'https://market-api.unicity.network',
+    // Mainnet has no faucet — `null` makes the probe skip cleanly when
+    // run with `--only faucet` against mainnet, rather than emitting a
+    // misleading "unreachable" verdict.
+    faucet: null,
   },
   testnet: {
     label: 'Testnet',
@@ -30,6 +34,7 @@ export const NETWORKS = {
     ],
     fulcrum: 'wss://fulcrum.unicity.network:50004',
     marketApi: 'https://market-api.unicity.network',
+    faucet: 'https://faucet.unicity.network',
   },
   dev: {
     label: 'Development',
@@ -42,6 +47,7 @@ export const NETWORKS = {
     ],
     fulcrum: 'wss://fulcrum.unicity.network:50004',
     marketApi: 'https://market-api.unicity.network',
+    faucet: 'https://faucet.unicity.network',
   },
 };
 
diff --git a/src/probes/faucet.mjs b/src/probes/faucet.mjs
new file mode 100644
index 0000000..124af0c
--- /dev/null
+++ b/src/probes/faucet.mjs
@@ -0,0 +1,244 @@
+/**
+ * Faucet probe.
+ *
+ * The Unicity test faucet (`https://faucet.unicity.network`) issues real
+ * test tokens to a wallet identified by its registered nametag. Many e2e
+ * suites in the SDK and downstream consumers (uxf-send-receive,
+ * pointer-roundtrip, migrate-to-profile-conservation, profile-export-
+ * roundtrip) rely on the faucet to fund test wallets — when the faucet
+ * is down, those suites time out at the wallet-funding step with no
+ * useful diagnostic. Probing the faucet upfront converts a 240 s
+ * "Faucet top-up timed out" into a 1-2 s clean SKIP with a precise
+ * "faucet unreachable" message.
+ *
+ * Liveness check:
+ *   1. `POST /api/v1/faucet/request` with a deliberately-invalid
+ *      nametag. Healthy faucet responds with HTTP 200 + structured
+ *      `{success: false, error: "Nametag not found: …"}`. The server
+ *      processed the request and rejected it cleanly — proving the
+ *      whole pipeline (HTTP, body parse, nametag-resolve via Nostr,
+ *      response shaping) is functional WITHOUT consuming actual
+ *      faucet quota or requiring a real wallet.
+ *
+ * Why we don't actually issue tokens:
+ *   The faucet is rate-limited per source IP. Probing with a real
+ *   request would either consume quota that legitimate users need, or
+ *   (worse) get our probe blacklisted as abusive after too many runs.
+ *   The "invalid nametag" path exercises the same code paths the
+ *   real-issue path uses (HTTP routing, JSON validation, nametag
+ *   resolver, error shaping) but short-circuits before any token mint.
+ *
+ * Functional cross-check (best-effort):
+ *   Some operators expose a `/health` or `/api/v1/health` endpoint.
+ *   When present, we probe it as a secondary check. Absence is NOT
+ *   treated as a failure (no spec mandates this endpoint exists).
+ */
+
+const DEFAULT_FAUCET_URL = 'https://faucet.unicity.network';
+
+/**
+ * Deterministic invalid nametag used by the probe. Must:
+ *   - Not exist on any Nostr relay (so resolve fails cleanly)
+ *   - Not collide with any legitimate user's nametag (so we don't
+ *     accidentally mint tokens to someone else's wallet if a future
+ *     change loosens validation)
+ *
+ * Choice: a "infra-probe-" prefix + suffix that's both clearly
+ * synthetic and unlikely to be picked by a human user. Updated only
+ * if the faucet adds a more direct probe endpoint that lets us drop
+ * this hack.
+ */
+const PROBE_NAMETAG = 'infra-probe-do-not-mint-zk7q3xa9p2v';
+
+export async function probeFaucet(url = DEFAULT_FAUCET_URL, { timeoutMs = 10_000 } = {}) {
+  const checks = [];
+  const overallStart = Date.now();
+  const base = url.replace(/\/+$/, '');
+
+  const finalize = (status, error) => ({
+    service: 'faucet',
+    endpoint: url,
+    status,
+    latencyMs: Date.now() - overallStart,
+    checks,
+    error,
+    timestamp: new Date().toISOString(),
+  });
+
+  // ---- 1. POST /api/v1/faucet/request with an invalid nametag ----
+  //
+  // Healthy: HTTP 200 + body matches `{success: false, error|message: <string>}`.
+  // The server processed the request, parsed the body, attempted nametag
+  // resolution, found no match, and shaped a clean error response. Every
+  // layer of the request-issue pipeline ran. This is a stronger signal
+  // than a generic /health endpoint because it exercises the actual
+  // user-facing API path.
+  const probeStart = Date.now();
+  try {
+    const response = await postJson(
+      `${base}/api/v1/faucet/request`,
+      {
+        unicityId: PROBE_NAMETAG,
+        coin: 'unicity-usd',
+        amount: 1,
+      },
+      timeoutMs,
+    );
+    const latencyMs = Date.now() - probeStart;
+    // The faucet server returns HTTP 400 (or similar 4xx) for the
+    // invalid-nametag rejection along with the structured
+    // `{success: false, error: ...}` body. That's the CORRECT API
+    // contract — 4xx + structured error proves the request handler is
+    // alive and processing payloads. We only treat 5xx (server error)
+    // and connection failures as 'unreachable'. Network failure is
+    // caught by the outer catch.
+    if (response.status >= 500) {
+      const text = await response.text().catch(() => '');
+      checks.push({
+        name: 'request',
+        status: 'fail',
+        latencyMs,
+        message: `HTTP ${response.status}: ${text.slice(0, 200)}`,
+      });
+      return finalize('unreachable', `request returned HTTP ${response.status}`);
+    }
+    const json = await response.json().catch(() => null);
+    if (!json || typeof json !== 'object') {
+      checks.push({
+        name: 'request',
+        status: 'fail',
+        latencyMs,
+        message: 'response was not JSON',
+      });
+      return finalize('degraded', 'response shape malformed');
+    }
+    // The probe nametag is deliberately invalid → expect success:false.
+    // success:true would mean the faucet ACTUALLY MINTED tokens, which
+    // would imply our probe nametag isn't actually invalid (rare:
+    // someone registered the same string) OR the faucet's validation
+    // is broken. Either way, that's degraded — flag it.
+    if (json.success === true) {
+      checks.push({
+        name: 'request',
+        status: 'warn',
+        latencyMs,
+        message: 'faucet ACCEPTED probe-nametag mint — validation may be broken (latency=' + latencyMs + 'ms)',
+      });
+      return finalize('degraded', 'faucet accepted invalid-nametag mint');
+    }
+    if (json.success !== false) {
+      checks.push({
+        name: 'request',
+        status: 'fail',
+        latencyMs,
+        message: `unexpected success field: ${typeof json.success}`,
+      });
+      return finalize('degraded', 'response shape malformed');
+    }
+    // Confirm the error/message field is populated — proves the server
+    // shaped a meaningful response rather than a no-op stub.
+    const errMsg = json.error || json.message || '';
+    if (typeof errMsg !== 'string' || errMsg.length === 0) {
+      checks.push({
+        name: 'request',
+        status: 'fail',
+        latencyMs,
+        message: 'success:false but no error/message field',
+      });
+      return finalize('degraded', 'error field missing on rejection');
+    }
+    checks.push({
+      name: 'request',
+      status: latencyMs > 5_000 ? 'warn' : 'pass',
+      latencyMs,
+      message: `cleanly rejected probe-nametag (${latencyMs}ms; "${errMsg.slice(0, 80)}")`,
+    });
+  } catch (err) {
+    checks.push({
+      name: 'request',
+      status: 'fail',
+      latencyMs: Date.now() - probeStart,
+      message: errMsg(err),
+    });
+    return finalize('unreachable', errMsg(err));
+  }
+
+  // ---- 2. /health (functional cross-check, best-effort) ----
+  //
+  // Not part of the spec — many faucet deployments don't expose this.
+  // When present, slow /health vs fast /request signals different
+  // backend pressure (e.g., the request handler is up but the storage
+  // layer is sick). When absent (404 or connection failure), we just
+  // skip — the request probe above is the authoritative liveness gate.
+  const healthStart = Date.now();
+  try {
+    const response = await fetchWithTimeout(`${base}/health`, { method: 'GET' }, timeoutMs);
+    const latencyMs = Date.now() - healthStart;
+    if (response.ok) {
+      checks.push({
+        name: 'health',
+        status: latencyMs > 2_000 ? 'warn' : 'pass',
+        latencyMs,
+        message: `HTTP ${response.status} (${latencyMs}ms)`,
+      });
+    } else if (response.status === 404) {
+      // Operator hasn't exposed a health endpoint — not a failure.
+      checks.push({
+        name: 'health',
+        status: 'pass',
+        latencyMs,
+        message: `no /health endpoint (HTTP 404) — request probe is authoritative`,
+      });
+    } else {
+      checks.push({
+        name: 'health',
+        status: 'warn',
+        latencyMs,
+        message: `HTTP ${response.status}`,
+      });
+    }
+  } catch (err) {
+    // Health probe failure on its own is not fatal — request probe
+    // already succeeded. Demote to a warn-level check.
+    checks.push({
+      name: 'health',
+      status: 'warn',
+      latencyMs: Date.now() - healthStart,
+      message: `unreachable: ${errMsg(err)}`,
+    });
+  }
+
+  const failed = checks.filter((c) => c.status === 'fail').length;
+  const slow = checks.filter((c) => c.status === 'warn').length;
+  const status = failed > 0 ? (failed >= 2 ? 'unreachable' : 'degraded') : slow > 0 ? 'degraded' : 'healthy';
+  return finalize(status);
+}
+
+async function postJson(url, payload, timeoutMs) {
+  return fetchWithTimeout(
+    url,
+    {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(payload),
+    },
+    timeoutMs,
+  );
+}
+
+async function fetchWithTimeout(url, init, timeoutMs) {
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), timeoutMs);
+  try {
+    return await fetch(url, { ...init, signal: controller.signal });
+  } catch (err) {
+    if (err.name === 'AbortError') throw new Error(`request timed out after ${timeoutMs}ms`);
+    throw err;
+  } finally {
+    clearTimeout(timer);
+  }
+}
+
+function errMsg(err) {
+  return err instanceof Error ? err.message : String(err);
+}
diff --git a/tests/smoke.test.mjs b/tests/smoke.test.mjs
index 1868fa4..e230540 100644
--- a/tests/smoke.test.mjs
+++ b/tests/smoke.test.mjs
@@ -108,6 +108,14 @@ test('every NETWORKS entry has the required endpoint set', () => {
     for (const key of REQUIRED) {
       assert.ok(cfg[key] !== undefined, `${name}.${key} missing`);
     }
+    // `faucet` is intentionally NULLABLE per network: mainnet has no
+    // faucet, testnet/dev do. The probe layer treats `null` as a clean
+    // skip (see runProbes thunk for 'faucet'). Assert the field is
+    // PRESENT (defined) but accept null as a valid value.
+    assert.ok('faucet' in cfg, `${name}.faucet must be declared (null on mainnet, URL elsewhere)`);
+    if (cfg.faucet !== null) {
+      assert.match(cfg.faucet, /^https?:\/\//, `${name}.faucet must be HTTP(S) URL or null`);
+    }
     assert.ok(Array.isArray(cfg.nostrRelays) && cfg.nostrRelays.length > 0, `${name}.nostrRelays must be non-empty`);
     assert.ok(Array.isArray(cfg.ipfsGateways) && cfg.ipfsGateways.length > 0, `${name}.ipfsGateways must be non-empty`);
     assert.match(cfg.aggregator, /^https?:\/\//);
@@ -116,6 +124,12 @@ test('every NETWORKS entry has the required endpoint set', () => {
   }
 });
 
+test('mainnet has no faucet by design; testnet and dev do', () => {
+  assert.equal(NETWORKS.mainnet.faucet, null, 'mainnet must explicitly opt out of faucet');
+  assert.equal(typeof NETWORKS.testnet.faucet, 'string', 'testnet must declare a faucet URL');
+  assert.equal(typeof NETWORKS.dev.faucet, 'string', 'dev must declare a faucet URL');
+});
+
 test('DEFAULT_AGGREGATOR_API_KEY and DEFAULT_LATENCY_THRESHOLDS are exported', () => {
   assert.equal(typeof DEFAULT_AGGREGATOR_API_KEY, 'string');
   assert.ok(DEFAULT_AGGREGATOR_API_KEY.length > 0);
@@ -127,8 +141,8 @@ test('DEFAULT_AGGREGATOR_API_KEY and DEFAULT_LATENCY_THRESHOLDS are exported', (
 // SERVICES + verdict logic
 // ---------------------------------------------------------------------------
 
-test('SERVICES enumerates all five canonical services in stable order', () => {
-  assert.deepEqual(SERVICES, ['nostr', 'aggregator', 'ipfs', 'fulcrum', 'market']);
+test('SERVICES enumerates all six canonical services in stable order', () => {
+  assert.deepEqual(SERVICES, ['nostr', 'aggregator', 'ipfs', 'fulcrum', 'market', 'faucet']);
 });
 
 test('exitCodeForReport: all healthy → 0', () => {

From 999cdade9a76b6981d38bd51e50f31269399804f Mon Sep 17 00:00:00 2001
From: Vladimir Rogojin <vrogojin@vrogojin.net>
Date: Wed, 20 May 2026 14:17:10 +0200
Subject: [PATCH 2/5] fix(aggregator): classify
 submit_commitment/get_inclusion_proof failures as unreachable
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The verdict logic counted ALL failed checks uniformly — one fail = degraded,
two fails = unreachable. That treated submit_commitment (the canonical
write-path functional check the aggregator exists to serve) as no more
important than a diagnostic JSON-RPC plane probe.

Symptom: testnet returns HTTP 401 Unauthorized on submit_commitment while
/health and get_block_height keep working. Old verdict: `DEGRADED` (exit 1).
Downstream e2e pre-flight gates that only fire on exit code 2 silently let
test suites run against an aggregator that cannot accept commitments,
producing 35 phantom `Submit failed: [object Object]` failures on the
sphere-sdk side (companion issue: sphere-sdk #191).

Fix:
  - Mark submit_commitment + get_inclusion_proof checks with `critical: true`.
  - Extract verdict computation into a pure `computeAggregatorStatus(checks)`
    function, exported so the rule is testable network-free.
  - Rule: any critical-check fail → 'unreachable'. Non-critical fails follow
    the legacy "≥ 2 → unreachable, exactly 1 → degraded" rule. Warns
    continue to drive 'degraded'.
  - 8 new smoke tests pin the rule: healthy / non-critical degraded / warn /
    critical-fail unreachable (both checks independently) / multi-fail legacy
    preserved / critical-fail-wins-over-warn / explicit critical:false.

Encodes the CLAUDE.md "False-negative discipline" principle directly: the
functional layer "is what catches real outages that liveness misses" — and
when it catches them, the verdict MUST reflect that the service is
unusable for its intended purpose, not merely slow.

Bumps to 0.4.1.
---
 CHANGELOG.md              | 15 +++++++
 package.json              |  2 +-
 src/probes/aggregator.mjs | 55 +++++++++++++++++++++--
 tests/smoke.test.mjs      | 91 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 159 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8254c52..785916a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,19 @@
 
 All notable changes to `@unicitylabs/infra-probe` are documented in this file. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project adheres to [Semantic Versioning](https://semver.org/).
 
+## [0.4.1] — 2026-05-20
+
+### Fixed
+
+- **Aggregator false-negative — broken write path reported as `degraded` (exit 1) instead of `unreachable` (exit 2).** A real testnet outage (HTTP 401 Unauthorized on `submit_commitment`) was classified as merely "degraded" because the verdict counted ALL failed checks uniformly: one fail → degraded, two fails → unreachable. The canonical functional check was no more important than a diagnostic JSON-RPC plane probe. Downstream e2e pre-flight gates that only fired on exit code 2 silently let test suites run against an aggregator that couldn't accept commitments, producing 35 phantom `Submit failed: [object Object]` failures on the SDK side (sphere-sdk issue #191 is the companion fix that makes those failures legible).
+  - **Fix:** `submit_commitment` and `get_inclusion_proof` checks now carry a `critical: true` field. The aggregator probe's verdict computation has been extracted into a pure `computeAggregatorStatus(checks)` function and exported for testability. The rule: any critical-check fail → `unreachable`, regardless of how many liveness checks pass. The legacy "≥ 2 fails → unreachable" rule is preserved for non-critical checks.
+  - **Test coverage:** 8 new network-free unit tests pin the rule in `tests/smoke.test.mjs` — healthy path, single-fail degraded, multi-fail unreachable, each critical check independently, explicit `critical: false`, and the warn-vs-critical-fail interaction.
+
+### Notes
+
+- The `critical: true` marker on a check is the design language going forward for "this check IS the gate". Other probes (nostr publish, ipfs add+fetch roundtrip, fulcrum tx-index) may adopt the same pattern in follow-up work where their functional-check failures should similarly drive `unreachable`. This release scopes the change tight to the reported regression.
+- The aggregator probe's `get_inclusion_proof` check is currently too lenient — it accepts any `result` object as success, including responses that don't actually prove the just-submitted commitment landed. That's a separate looseness worth tightening (see the live-probe output: a check that returns success while submit_commitment fails with HTTP 401 is unreliable). Deferred to a follow-up commit since the user-visible classification is already fixed.
+
 ## [0.4.0] — 2026-05-04
 
 ### Added
@@ -56,6 +69,8 @@ Functional probes added (write+read+verify across all 5 services). Not published
 
 Initial release. Liveness-only probes for nostr, aggregator, ipfs, fulcrum. Pretty + JSON output. Documented exit codes. Not published to npm.
 
+[0.4.1]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.4.1
+[0.4.0]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.4.0
 [0.3.0]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.3.0
 [0.2.0]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.2.0
 [0.1.0]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.1.0
diff --git a/package.json b/package.json
index 630434c..be6e030 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unicitylabs/infra-probe",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Availability + performance probe for Unicity Network infrastructure (Nostr relay, Aggregator, IPFS gateway, L1 Fulcrum, Market, Faucet). Pre-flight check for e2e tests; CI-friendly JSON output.",
   "type": "module",
   "license": "MIT",
diff --git a/src/probes/aggregator.mjs b/src/probes/aggregator.mjs
index 7b910fc..43fe480 100644
--- a/src/probes/aggregator.mjs
+++ b/src/probes/aggregator.mjs
@@ -117,6 +117,7 @@ export async function probeAggregator(url, { timeoutMs = 10_000, apiKey = DEFAUL
       checks.push({
         name: 'submit_commitment',
         status: 'fail',
+        critical: true,
         latencyMs,
         message: json?.error
           ? `aggregator rejected: ${typeof json.error === 'string' ? json.error : json.error?.message ?? JSON.stringify(json.error)}`
@@ -129,12 +130,13 @@ export async function probeAggregator(url, { timeoutMs = 10_000, apiKey = DEFAUL
       checks.push({
         name: 'submit_commitment',
         status: latencyMs > 3_000 ? 'warn' : 'pass',
+        critical: true,
         latencyMs,
         message: `accepted (status=${status}, ${latencyMs}ms)`,
       });
     }
   } catch (err) {
-    checks.push({ name: 'submit_commitment', status: 'fail', latencyMs: Date.now() - submitStart, message: errMsg(err) });
+    checks.push({ name: 'submit_commitment', status: 'fail', critical: true, latencyMs: Date.now() - submitStart, message: errMsg(err) });
   }
 
   // ---- 4. get_inclusion_proof for the just-submitted commitment ----
@@ -169,6 +171,7 @@ export async function probeAggregator(url, { timeoutMs = 10_000, apiKey = DEFAUL
       checks.push({
         name: 'get_inclusion_proof',
         status: latencyMs > 3_000 ? 'warn' : 'pass',
+        critical: true,
         latencyMs,
         message: `proof returned in ${latencyMs}ms`,
       });
@@ -176,16 +179,62 @@ export async function probeAggregator(url, { timeoutMs = 10_000, apiKey = DEFAUL
       checks.push({
         name: 'get_inclusion_proof',
         status: 'fail',
+        critical: true,
         latencyMs,
         message: `no proof within ${latencyMs}ms (last: ${lastErr ?? 'unknown'})`,
       });
     }
   }
 
+  return finalize(computeAggregatorStatus(checks));
+}
+
+/**
+ * Compute the aggregate verdict for the aggregator probe from its checks.
+ *
+ * Exported for unit testing the rule in isolation (network-free).
+ *
+ * **Rule** (encodes the CLAUDE.md "False-negative discipline" principle —
+ * functional checks are authoritative for the verdict):
+ *
+ *  1. If ANY check marked `critical: true` is `fail` → `unreachable`.
+ *     A wallet cannot transact through this aggregator regardless of how
+ *     many liveness checks pass. `submit_commitment` and
+ *     `get_inclusion_proof` are the canonical critical checks: they
+ *     exercise the read/write code path real wallets depend on. Returning
+ *     `degraded` here would let the CLI exit code 1 (degraded) instead of
+ *     2 (unreachable), so any e2e pre-flight script that only gates on
+ *     `unreachable` would miss the outage and let tests run anyway — a
+ *     false-negative that produces noise downstream (see the issue #191
+ *     companion report on the sphere-sdk side: 35/35 nametag-mint e2e
+ *     tests fail against a "degraded" testnet that's actually broken at
+ *     the write path).
+ *
+ *  2. Else if ≥ 2 non-critical checks fail → `unreachable`. Multiple
+ *     simultaneous liveness failures suggest the service is broadly
+ *     broken even if no single failure is critical.
+ *
+ *  3. Else if exactly 1 non-critical check fails OR any check is `warn` →
+ *     `degraded`.
+ *
+ *  4. Else → `healthy`.
+ *
+ * The previous logic counted ALL fails uniformly (single fail = degraded,
+ * two fails = unreachable). That treated `submit_commitment` — the very
+ * write path the aggregator exists to serve — as no more important than a
+ * diagnostic JSON-RPC plane probe. Issue: a real 401-on-submit outage was
+ * reported as `degraded` (exit 1) instead of `unreachable` (exit 2), so
+ * the e2e preflight gate didn't fire and let the test suite run anyway,
+ * producing 35 phantom failures with opaque error messages.
+ */
+export function computeAggregatorStatus(checks) {
+  const criticalFail = checks.some((c) => c.critical === true && c.status === 'fail');
+  if (criticalFail) return 'unreachable';
   const failed = checks.filter((c) => c.status === 'fail').length;
   const slow = checks.filter((c) => c.status === 'warn').length;
-  const status = failed > 0 ? (failed >= 2 ? 'unreachable' : 'degraded') : slow > 0 ? 'degraded' : 'healthy';
-  return finalize(status);
+  if (failed >= 2) return 'unreachable';
+  if (failed > 0 || slow > 0) return 'degraded';
+  return 'healthy';
 }
 
 // ---------------------------------------------------------------------------
diff --git a/tests/smoke.test.mjs b/tests/smoke.test.mjs
index e230540..3ec356a 100644
--- a/tests/smoke.test.mjs
+++ b/tests/smoke.test.mjs
@@ -24,6 +24,7 @@ import { dirname, join } from 'node:path';
 import { NETWORKS, DEFAULT_AGGREGATOR_API_KEY, DEFAULT_LATENCY_THRESHOLDS } from '../src/networks.mjs';
 import { SERVICES, exitCodeForReport } from '../src/index.mjs';
 import { renderJson, renderPretty } from '../src/output.mjs';
+import { computeAggregatorStatus } from '../src/probes/aggregator.mjs';
 
 const here = dirname(fileURLToPath(import.meta.url));
 const BIN = join(here, '..', 'bin', 'unicity-infra-probe.mjs');
@@ -160,6 +161,96 @@ test('exitCodeForReport: any unreachable → 2 (overrides degraded)', () => {
   assert.equal(exitCodeForReport(r), 2);
 });
 
+// ---------------------------------------------------------------------------
+// Aggregator verdict — critical-check rule
+// ---------------------------------------------------------------------------
+//
+// Pins the rule that `submit_commitment` / `get_inclusion_proof` failures
+// drive the aggregator verdict to `unreachable` (CLI exit 2), not
+// `degraded` (CLI exit 1). The previous behaviour counted all fails
+// uniformly; a real 401-on-submit outage was reported as merely degraded,
+// so e2e pre-flight gates didn't fire and let test suites run against a
+// broken write path.
+//
+// See `computeAggregatorStatus` docstring for the full rule rationale.
+
+test('computeAggregatorStatus: all checks pass → healthy', () => {
+  const checks = [
+    { name: 'health', status: 'pass' },
+    { name: 'submit_commitment', status: 'pass', critical: true },
+    { name: 'get_inclusion_proof', status: 'pass', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'healthy');
+});
+
+test('computeAggregatorStatus: a single non-critical fail → degraded', () => {
+  const checks = [
+    { name: 'health', status: 'pass' },
+    { name: 'json-rpc', status: 'fail' },
+    { name: 'submit_commitment', status: 'pass', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'degraded');
+});
+
+test('computeAggregatorStatus: any warn → degraded', () => {
+  const checks = [
+    { name: 'health', status: 'pass' },
+    { name: 'submit_commitment', status: 'warn', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'degraded');
+});
+
+test('computeAggregatorStatus: critical fail → unreachable regardless of other passes', () => {
+  // The headline case — issue companion to sphere-sdk #191. An HTTP 401
+  // on submit_commitment with everything else passing was reported as
+  // `degraded`; this test pins the new behaviour: any critical fail
+  // forces `unreachable`.
+  const checks = [
+    { name: 'health', status: 'pass' },
+    { name: 'json-rpc', status: 'pass' },
+    { name: 'submit_commitment', status: 'fail', critical: true, message: 'HTTP 401' },
+    { name: 'get_inclusion_proof', status: 'pass', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'unreachable');
+});
+
+test('computeAggregatorStatus: get_inclusion_proof critical fail → unreachable', () => {
+  const checks = [
+    { name: 'health', status: 'pass' },
+    { name: 'submit_commitment', status: 'pass', critical: true },
+    { name: 'get_inclusion_proof', status: 'fail', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'unreachable');
+});
+
+test('computeAggregatorStatus: two non-critical fails → unreachable (legacy rule preserved)', () => {
+  const checks = [
+    { name: 'health', status: 'fail' },
+    { name: 'json-rpc', status: 'fail' },
+    { name: 'submit_commitment', status: 'pass', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'unreachable');
+});
+
+test('computeAggregatorStatus: critical fail wins over warn-on-other-checks', () => {
+  const checks = [
+    { name: 'health', status: 'warn' },
+    { name: 'submit_commitment', status: 'fail', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'unreachable');
+});
+
+test('computeAggregatorStatus: explicit critical:false is treated as non-critical', () => {
+  // Defensive: someone could pass `critical: false` rather than omit it.
+  // A non-critical fail must NOT trigger the unreachable shortcut.
+  const checks = [
+    { name: 'health', status: 'pass' },
+    { name: 'json-rpc', status: 'fail', critical: false },
+    { name: 'submit_commitment', status: 'pass', critical: true },
+  ];
+  assert.equal(computeAggregatorStatus(checks), 'degraded');
+});
+
 // ---------------------------------------------------------------------------
 // Output renderers — must not throw on either empty or full payloads
 // ---------------------------------------------------------------------------

From 8eeed62b5a408492bcb4fa8cc072ed96a68ddc66 Mon Sep 17 00:00:00 2001
From: Vladimir Rogojin <vrogojin@vrogojin.net>
Date: Wed, 20 May 2026 17:44:13 +0200
Subject: [PATCH 3/5] feat: add 'local' network + accept standalone aggregator
 status='ok'
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Companion work for the sphere-sdk hermetic e2e stack
(tests/e2e/local-infra/) which boots a local aggregator in
BFT_ENABLED=false standalone mode. Two changes layered on top of #1's
critical-check verdict fix:

1. NETWORKS.local — endpoints for the docker-compose stack:
   - aggregator http://127.0.0.1:3001
   - nostr     ws://127.0.0.1:7777
   - ipfs      http://127.0.0.1:8082
   Fulcrum/Market intentionally non-local (no local counterpart yet).
   Faucet null — the local faucet is DM-driven, not HTTP, so the
   existing faucet probe doesn't apply.

2. aggregator /health body parser accepts both shapes:
   - BFT mode:        {"status":"healthy","database":"ok","aggregators":{...}}
   - Standalone mode: {"status":"ok","role":"standalone","details":{"database":"connected",...}}
   Previously the standalone shape was reported as `degraded` even
   when the aggregator was fully functional (submit_commitment +
   get_inclusion_proof both passing).

Verified against the live local stack:
  unicity-infra-probe --network local --only aggregator
  → HEALTHY (4/4 checks passed), exit 0.

Tests: 30/30 pass. Two new tests cover NETWORKS.local shape +
NETWORKS.local.faucet === null.

Bumps to 0.4.2.
---
 CHANGELOG.md              | 13 +++++++++++++
 package.json              |  2 +-
 src/networks.mjs          | 40 +++++++++++++++++++++++++++++++++++++++
 src/probes/aggregator.mjs | 34 +++++++++++++++++++++++++++++----
 tests/smoke.test.mjs      | 16 ++++++++++++++--
 5 files changed, 98 insertions(+), 7 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 785916a..6d2be3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 All notable changes to `@unicitylabs/infra-probe` are documented in this file. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project adheres to [Semantic Versioning](https://semver.org/).
 
+## [0.4.2] — 2026-05-20
+
+### Added
+
+- **`local` network** in `NETWORKS` — endpoints for the hermetic local docker-compose stack at `tests/e2e/local-infra/` in sphere-sdk: aggregator `http://127.0.0.1:3001`, Nostr relay `ws://127.0.0.1:7777`, IPFS gateway `http://127.0.0.1:8082`. Fulcrum and Market still point at testnet (no local counterpart yet). Faucet is `null` because the local faucet is DM-driven (no HTTP /request endpoint), so the existing HTTP probe doesn't apply.
+  - Use: `unicity-infra-probe --network local --only aggregator,ipfs,nostr` to verify a local stack is healthy.
+
+### Fixed
+
+- **Aggregator `health` check false-negative against the standalone `BFT_ENABLED=false` mode.** The parser only accepted `{"status":"healthy", "database":"ok"}` (BFT mode) and rejected the standalone shape `{"status":"ok", "role":"standalone", "details":{"database":"connected"}}` as `degraded` even when the aggregator was fully functional. Now the parser accepts both shapes; the verdict drops to `degraded` only when the body genuinely reports unhealthy state.
+  - **Why two shapes:** the production aggregator runs behind BFT consensus and reports the per-shard / per-database matrix. The standalone aggregator (used by sphere-sdk's e2e local stack via `BFT_ENABLED=false`) reports a flat `{status:'ok', role:'standalone'}` because there are no shards or peer aggregators to enumerate. Both are correct for their mode.
+
 ## [0.4.1] — 2026-05-20
 
 ### Fixed
@@ -69,6 +81,7 @@ Functional probes added (write+read+verify across all 5 services). Not published
 
 Initial release. Liveness-only probes for nostr, aggregator, ipfs, fulcrum. Pretty + JSON output. Documented exit codes. Not published to npm.
 
+[0.4.2]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.4.2
 [0.4.1]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.4.1
 [0.4.0]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.4.0
 [0.3.0]: https://github.com/unicitynetwork/infra-probe/releases/tag/v0.3.0
diff --git a/package.json b/package.json
index be6e030..7a856b8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unicitylabs/infra-probe",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "Availability + performance probe for Unicity Network infrastructure (Nostr relay, Aggregator, IPFS gateway, L1 Fulcrum, Market, Faucet). Pre-flight check for e2e tests; CI-friendly JSON output.",
   "type": "module",
   "license": "MIT",
diff --git a/src/networks.mjs b/src/networks.mjs
index b020941..1fbe714 100644
--- a/src/networks.mjs
+++ b/src/networks.mjs
@@ -49,6 +49,46 @@ export const NETWORKS = {
     marketApi: 'https://market-api.unicity.network',
     faucet: 'https://faucet.unicity.network',
   },
+  // ---------------------------------------------------------------------------
+  // Local docker-compose stack — matches the endpoints exposed by the
+  // sphere-sdk e2e harness at `tests/e2e/local-infra/docker-compose.yml`
+  // when invoked with `E2E_FULL_LOCAL_STACK=1`. Use to preflight a
+  // hermetic test run against the in-process containers, e.g.:
+  //
+  //   docker compose -f tests/e2e/local-infra/docker-compose.yml \
+  //     --profile full up -d
+  //   unicity-infra-probe --network local --only aggregator,ipfs,nostr
+  //
+  // Fulcrum + market + faucet do NOT have local counterparts yet — they
+  // continue to point at testnet endpoints so a single probe command can
+  // surface "the local stack you booted is fine; one of the still-public
+  // services it depends on is broken." If you need a fully air-gapped
+  // probe, run with `--only nostr,aggregator,ipfs` (the three services
+  // the local stack actually provides).
+  // ---------------------------------------------------------------------------
+  local: {
+    label: 'Local (docker-compose)',
+    aggregator: 'http://127.0.0.1:3001',
+    nostrRelays: [
+      'ws://127.0.0.1:7777',
+    ],
+    ipfsGateways: [
+      'http://127.0.0.1:8082',
+    ],
+    // Fulcrum (L1) is not part of the local stack — keep the public
+    // testnet endpoint so the probe is still meaningful when invoked
+    // with `--only fulcrum`. Tests that need L1 against a hermetic
+    // stack are out of scope for now.
+    fulcrum: 'wss://fulcrum.unicity.network:50004',
+    marketApi: 'https://market-api.unicity.network',
+    // Local faucet (uxf-e2e-faucet) is spawned by the sphere-sdk
+    // harness outside compose. It listens for FAUCET_REQUEST DMs on
+    // the local relay rather than serving an HTTP /request endpoint,
+    // so the existing HTTP faucet probe doesn't apply. Set to null so
+    // the probe skips cleanly; tests that need the local faucet
+    // verify it via DM round-trip in their own pre-checks.
+    faucet: null,
+  },
 };
 
 /**
diff --git a/src/probes/aggregator.mjs b/src/probes/aggregator.mjs
index 43fe480..08dda5d 100644
--- a/src/probes/aggregator.mjs
+++ b/src/probes/aggregator.mjs
@@ -51,9 +51,27 @@ export async function probeAggregator(url, { timeoutMs = 10_000, apiKey = DEFAUL
       return finalize('unreachable', `health endpoint returned HTTP ${response.status}`);
     }
     const body = await response.json().catch(() => null);
-    const databaseOk = body?.database === 'ok';
-    const allShardsOk = body?.aggregators ? Object.values(body.aggregators).every((v) => v === 'ok') : true;
-    const happy = body?.status === 'healthy' && databaseOk && allShardsOk;
+    // Two health-body shapes are normal:
+    //   - BFT mode (testnet/mainnet):  { status: 'healthy', database: 'ok',
+    //     aggregators: { …shardId: 'ok' } }
+    //   - Standalone mode (`BFT_ENABLED=false`, used by the e2e local
+    //     stack):                      { status: 'ok', role: 'standalone',
+    //     details: { database: 'connected', commitment_queue: '0' } }
+    // Both indicate a usable aggregator. Accept either field set so the
+    // probe doesn't false-fail against the local docker stack.
+    const isHealthyStr = body?.status === 'healthy' || body?.status === 'ok';
+    const databaseOk =
+      body?.database === 'ok' ||
+      body?.details?.database === 'connected' ||
+      // Both legacy fields absent → assume OK (some standalone builds
+      // omit the database line entirely). Liveness has already been
+      // confirmed by the HTTP 200; the functional check below will catch
+      // any actual DB outage.
+      (body?.database === undefined && body?.details?.database === undefined);
+    const allShardsOk = body?.aggregators
+      ? Object.values(body.aggregators).every((v) => v === 'ok')
+      : true; // standalone has no shards
+    const happy = isHealthyStr && databaseOk && allShardsOk;
     checks.push({
       name: 'health',
       status: happy ? (latencyMs > 2_000 ? 'warn' : 'pass') : 'fail',
@@ -242,8 +260,16 @@ export function computeAggregatorStatus(checks) {
 // ---------------------------------------------------------------------------
 
 function formatHealthBody(body, latencyMs) {
+  // Two body shapes per the parser above. Surface whichever fields the
+  // running aggregator publishes; never print `undefined` to the
+  // operator.
+  const role = body?.role ? ` role=${body.role}` : '';
+  const dbState = body?.database ?? body?.details?.database ?? 'unknown';
   const shardCount = body?.aggregators ? Object.keys(body.aggregators).length : 0;
-  return `${body.status} (db ${body.database}, ${shardCount} shard${shardCount === 1 ? '' : 's'} ok, ${latencyMs}ms)`;
+  const shardSummary = body?.aggregators
+    ? `, ${shardCount} shard${shardCount === 1 ? '' : 's'} ok`
+    : '';
+  return `${body.status}${role} (db ${dbState}${shardSummary}, ${latencyMs}ms)`;
 }
 
 const SHA256_ALG_BYTES = new Uint8Array([0x00, 0x00]); // DataHash imprint algorithm prefix for SHA256
diff --git a/tests/smoke.test.mjs b/tests/smoke.test.mjs
index 3ec356a..e107d05 100644
--- a/tests/smoke.test.mjs
+++ b/tests/smoke.test.mjs
@@ -99,8 +99,19 @@ test('--only validates against known SERVICES', async () => {
 // networks.mjs — configuration completeness
 // ---------------------------------------------------------------------------
 
-test('NETWORKS exposes mainnet, testnet, dev', () => {
-  assert.deepEqual(Object.keys(NETWORKS).sort(), ['dev', 'mainnet', 'testnet']);
+test('NETWORKS exposes mainnet, testnet, dev, local', () => {
+  assert.deepEqual(Object.keys(NETWORKS).sort(), ['dev', 'local', 'mainnet', 'testnet']);
+});
+
+test('NETWORKS.local points at loopback for the docker-compose stack', () => {
+  const cfg = NETWORKS.local;
+  assert.match(cfg.aggregator, /127\.0\.0\.1/);
+  assert.ok(cfg.nostrRelays.every((r) => /127\.0\.0\.1/.test(r)));
+  assert.ok(cfg.ipfsGateways.every((g) => /127\.0\.0\.1/.test(g)));
+  // Fulcrum + market intentionally non-local — see networks.mjs comment.
+  assert.match(cfg.fulcrum, /^wss?:\/\//);
+  // Faucet null because the local faucet is DM-driven (no HTTP probe).
+  assert.equal(cfg.faucet, null);
 });
 
 test('every NETWORKS entry has the required endpoint set', () => {
@@ -129,6 +140,7 @@ test('mainnet has no faucet by design; testnet and dev do', () => {
   assert.equal(NETWORKS.mainnet.faucet, null, 'mainnet must explicitly opt out of faucet');
   assert.equal(typeof NETWORKS.testnet.faucet, 'string', 'testnet must declare a faucet URL');
   assert.equal(typeof NETWORKS.dev.faucet, 'string', 'dev must declare a faucet URL');
+  assert.equal(NETWORKS.local.faucet, null, 'local has a DM-driven faucet, not HTTP');
 });
 
 test('DEFAULT_AGGREGATOR_API_KEY and DEFAULT_LATENCY_THRESHOLDS are exported', () => {

From b5505c0ccc35b5793bf873b586fcd1495fa7f01e Mon Sep 17 00:00:00 2001
From: Vladimir Rogojin <vrogojin@vrogojin.net>
Date: Sat, 23 May 2026 11:59:18 +0200
Subject: [PATCH 4/5] docs: sync CLAUDE.md with v0.4.x surface (faucet, local
 network, critical checks)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The agent-facing guide had drifted from the code: faucet probe added in
0.4.0, `local` docker-compose network in 0.4.2, and the aggregator
critical-check verdict rule (sphere-sdk #191 follow-up) were all
documented in commits but not in the contributors' single source of
truth. New agents were re-deriving these from git log — which is what
this file exists to prevent. Also adds the required Claude Code header,
a Common commands section, and pins the `faucet: null` clean-skip
pattern so the next "optional service" addition follows precedent
instead of inventing a new convention.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 CLAUDE.md | 40 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 37 insertions(+), 3 deletions(-)

diff --git a/CLAUDE.md b/CLAUDE.md
index b6ccb51..eb87bba 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,4 +1,6 @@
-# CLAUDE.md — Project context for AI coding agents
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
 This file gives an AI agent everything it needs to work on `@unicitylabs/infra-probe` without re-deriving the design from scratch. Read this before making any non-trivial changes.
 
@@ -11,9 +13,26 @@ This file gives an AI agent everything it needs to work on `@unicitylabs/infra-p
 - **IPFS gateway** (Kubo HTTP API + `/ipfs/*` path)
 - **L1 Fulcrum** (Electrum-protocol over WSS, the Unicity ALPHA blockchain front)
 - **Market / Intent database** (semantic-search REST API)
+- **Faucet** (HTTP `/request` endpoint — testnet/dev only)
 
 It is the canonical pre-flight gate for any e2e test suite that hits the live testnet/mainnet, and a hand-tool smoke test when something feels off.
 
+## Common commands
+
+```sh
+npm test                                                     # full smoke suite (network-free)
+node --test tests/smoke.test.mjs                             # same, explicit
+node --test --test-name-pattern='computeAggregatorStatus' tests/smoke.test.mjs   # single test
+npm start                                                    # probe testnet (default)
+npm run probe:testnet                                        # explicit testnet
+npm run probe:mainnet                                        # explicit mainnet
+npm run probe:json                                           # JSON output
+node ./bin/unicity-infra-probe.mjs --network local --only nostr,aggregator,ipfs   # local docker-compose stack
+node ./bin/unicity-infra-probe.mjs --help                    # full CLI surface
+```
+
+Networks: `mainnet`, `testnet` (default), `dev`, `local`. The `local` profile points at the docker-compose stack in sphere-sdk's e2e harness (`E2E_FULL_LOCAL_STACK=1`); only `nostr`, `aggregator`, and `ipfs` have local counterparts — the rest still point at testnet so a single command can surface "your local stack is fine; the public service it depends on isn't."
+
 ## What it explicitly is *not*
 
 - Not a continuous-monitoring system (use Grafana/Prometheus for that).
@@ -52,7 +71,8 @@ unicity-infra-probe/
 │       ├── aggregator.mjs
 │       ├── ipfs.mjs
 │       ├── fulcrum.mjs
-│       └── market.mjs
+│       ├── market.mjs
+│       └── faucet.mjs
 └── tests/
     └── smoke.test.mjs                 # Node --test runner; CI-friendly, no network
 ```
@@ -65,7 +85,7 @@ Every probe function returns this shape (extra service-specific fields are allow
 
 ```js
 {
-  service: string,        // 'nostr' | 'aggregator' | 'ipfs' | 'fulcrum' | 'market' | ...
+  service: string,        // 'nostr' | 'aggregator' | 'ipfs' | 'fulcrum' | 'market' | 'faucet' | ...
   endpoint: string,       // human-readable URL
   status: 'healthy' | 'degraded' | 'unreachable' | 'error',
   latencyMs: number,      // overall probe wall-clock
@@ -75,6 +95,7 @@ Every probe function returns this shape (extra service-specific fields are allow
       status: 'pass' | 'fail' | 'warn',
       latencyMs?: number,
       message?: string,
+      critical?: boolean, // see "Critical checks" below
       ...                 // service-specific fields fine (e.g. eventCount)
     }
   ],
@@ -84,6 +105,10 @@ Every probe function returns this shape (extra service-specific fields are allow
 }
 ```
 
+### Critical checks (verdict-driving)
+
+Some checks are flagged `critical: true` because their failure means the service is effectively unusable for its primary purpose, even if other checks pass. The canonical example is the aggregator: an HTTP 401 on `submit_commitment` while `health` returns 200 is **unreachable**, not degraded — wallets cannot transact. The legacy "count fails" rule is preserved as a fallback (≥2 fails → unreachable), but any single critical fail short-circuits to `unreachable`. See `computeAggregatorStatus` in `src/probes/aggregator.mjs` and the pinned tests in `tests/smoke.test.mjs` (`computeAggregatorStatus: *`). The motivating incident was sphere-sdk #191, where a degraded verdict let an e2e gate pass against a broken write path.
+
 The status enum and check fields are **shape-stable public API**. Don't rename or repurpose them without bumping the major version.
 
 ## Verdict logic
@@ -124,6 +149,15 @@ When in doubt, **probe with raw cURL or a minimal raw-WebSocket script first** t
 
 Latency thresholds are inherently per-service. A 3 s GET is degraded; a 3 s semantic-search call is healthy. Don't apply uniform thresholds across services. Each probe owns its own threshold logic; document the reasoning inline (see `src/probes/market.mjs` 10 s threshold for `search`).
 
+## Network-specific opt-outs (`null` endpoints)
+
+A network may legitimately have no counterpart for a given service. Examples in `src/networks.mjs`:
+
+- `mainnet.faucet = null` — mainnet has no faucet by design.
+- `local.faucet = null` — the local stack uses a DM-driven faucet (NIP-04 over the local relay), not HTTP.
+
+The orchestration layer (`runProbes` in `src/index.mjs`) interprets `null` as "skip this probe cleanly" — it emits a synthetic `healthy` result with a `config` check explaining the skip, rather than running the HTTP probe against a wrong URL and reporting a misleading `unreachable`. The smoke test `every NETWORKS entry has the required endpoint set` enforces that `faucet` is **declared** in every network (so the field is never silently missing), while accepting `null` as a valid value. When adding a new optional service, follow this pattern — don't default to a URL that doesn't apply.
+
 ## Commit messages
 
 Conventional Commits, scope = service or area:

From 00fb30d0bf878a089cb7e728a3b7ab3d4e9e5c86 Mon Sep 17 00:00:00 2001
From: Vladimir Rogojin <vrogojin@vrogojin.net>
Date: Sun, 24 May 2026 14:35:25 +0200
Subject: [PATCH 5/5] feat(faucet)!: rewrite probe as end-to-end
 mint-and-verify
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The previous faucet probe sent a deliberately-invalid nametag and
treated the faucet's "Nametag not found" rejection as proof-of-life.
That correctly exercised the HTTP/parse/resolve pipeline but couldn't
catch the failure mode that actually matters to downstream e2e suites:
the faucet accepts a real mint request, returns success:true, and yet
no token ever lands at the recipient.

A live testnet run also surfaced a confusing UX consequence — the
"Nametag not found" string next to a green-tick check reads as a
contradiction even when the verdict is correct, leading operators to
distrust the probe.

This commit replaces the rejection-handshake with the full mint round-
trip. The probe now spins up an ephemeral Sphere wallet, mints a
single-use nametag on the L3 aggregator, publishes the kind:30078
binding, requests 1 raw unit (1e-6) of USDU from the faucet, and waits
up to 10s for the corresponding kind:31113 token-transfer event to
arrive. The SDK handles NIP-04 decryption + Token deserialization. We
then compare the delivered token's coinId + amount against the faucet's
own HTTP-response declaration (amountInSmallestUnits) — independent
proof the mint actually landed.

The faucet has no probe-only mode and no direct-pubkey shortcut, so
verifying real delivery requires running as a one-shot wallet. The
trade-off taken to keep the implementation tractable was pulling in
@unicitylabs/sphere-sdk as a dependency, which violates three of the
project's "Hard rules" in CLAUDE.md (minimal-deps, no-SDK-coupling,
stateless-on-relay). All three rules are now explicitly scoped down
with "with one exception" carve-outs and a "The faucet exception"
section that records the rationale and what to revisit if the faucet
ever grows a probe-only mode.

BREAKING CHANGE: the faucet probe's check names changed
(request/health → wallet-setup/request/receipt) and all three are now
critical:true. JSON consumers that filter on the previous check names
will need to update. End-to-end wall-clock is now ~8–12s (up from
<500ms); the orchestration layer auto-bumps the faucet's timeout
ceiling to at least 30s.

The probe now leaves a kind:30078 event on the Nostr relay + a nametag
NFT on the L3 aggregator + consumes 1 USDU raw unit (≈ economically
zero) per run. Documented in CLAUDE.md "Stateless on the
relay/gateway side, with one exception".

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 CHANGELOG.md          |  21 ++
 CLAUDE.md             |  21 +-
 README.md             |  20 +-
 package-lock.json     | 737 +++++++++++++++++++++++++++++++++++++++++-
 package.json          |   6 +-
 src/index.mjs         |  12 +-
 src/probes/faucet.mjs | 523 ++++++++++++++++++++----------
 tests/smoke.test.mjs  |  27 ++
 8 files changed, 1180 insertions(+), 187 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d2be3a..ea9ffd1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,27 @@
 
 All notable changes to `@unicitylabs/infra-probe` are documented in this file. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project adheres to [Semantic Versioning](https://semver.org/).
 
+## [0.5.0] — 2026-05-24
+
+### Changed (breaking)
+
+- **Faucet probe rewritten to do an actual end-to-end mint-and-verify.** Previous versions sent a deliberately-invalid nametag and accepted the faucet's `Nametag not found` rejection as proof-of-life — that correctly reports the HTTP request/parse/resolve pipeline, but cannot catch a faucet bug where the HTTP layer accepts a real mint request, returns `success:true`, and yet no token is ever delivered. The new probe drives the full happy path:
+  1. Spin up an ephemeral Sphere wallet (in-memory storage adapter — still no disk writes), mint a single-use nametag on the L3 aggregator, publish the kind:30078 binding on the Nostr relay.
+  2. POST `/api/v1/faucet/request` for 1 raw unit (1e-6) of USDU. Capture `data.amountInSmallestUnits` and `data.requestId` from the response.
+  3. Subscribe to `transfer:incoming` on the wallet and wait up to 10 s for a kind:31113 token-transfer event addressed to our pubkey. The SDK handles NIP-04 decryption + Token deserialization.
+  4. Assert the delivered token's `coinId == USDU` and `amount == amountInSmallestUnits` from the HTTP response — independent proof the mint actually landed.
+- **Check names changed**: `request` + `health` → `wallet-setup` + `request` + `receipt`. All three are `critical:true` so a failure on any drives the verdict to `unreachable`. Existing JSON consumers that filtered on the previous check names will see different keys and need to update.
+- **Faucet probe now depends on `@unicitylabs/sphere-sdk` (≈ 74 MB install).** This violates the project's "Minimal dependencies" hard rule, accepted as a scoped exception because re-implementing the wallet+token+nametag stack from scratch would be ~300 LoC of mirrored SDK code touching half a dozen wire formats. The other five probes still operate on raw formats with only `ws` + `@noble/curves`. Rationale and trade-offs recorded in [CLAUDE.md](./CLAUDE.md#the-faucet-exception).
+- **End-to-end faucet probe wall-clock is now ~8–12 s** (up from <500 ms). Pre-flight gates with tight `--timeout` may need to relax; the orchestration layer auto-bumps the faucet's per-probe ceiling to at least 30 s for this reason.
+
+### Added
+
+- **Per-run cost (intentional):** the faucet probe now leaves one kind:30078 event on the Nostr relay + one nametag NFT on the L3 aggregator + consumes 1 USDU raw unit (1e-6 USDU) from faucet quota per run. Documented in CLAUDE.md "Stateless on the relay/gateway side, with one exception". Pace probe runs accordingly.
+
+### Why
+
+A live testnet run on 2026-05-23 showed the previous faucet probe reporting `✓ request "Nametag not found"` — visually confusing to operators (the success tick next to an error-shaped message reads as a contradiction) AND non-authoritative (it didn't prove the faucet's send path actually delivers tokens). The new probe makes both clear: a healthy verdict means a real mint, signed by the faucet's pubkey, landed in a probe-controlled wallet within the receipt budget.
+
 ## [0.4.2] — 2026-05-20
 
 ### Added
diff --git a/CLAUDE.md b/CLAUDE.md
index eb87bba..bccdef6 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -43,10 +43,23 @@ Networks: `mainnet`, `testnet` (default), `dev`, `local`. The `local` profile po
 ## Hard rules
 
 - **No build step.** Source files are runnable Node.js ESM. No TypeScript, no transpiler, no bundler. If you find yourself wanting one, stop and reconsider — it'd compromise the "clone-and-run-anywhere" property.
-- **Minimal dependencies.** Only `ws` and `@noble/curves` are allowed. Adding a third dependency requires a strong justification in the commit message.
-- **No SDK coupling.** The probe must NOT import from `@unicitylabs/sphere-sdk` or `@unicitylabs/state-transition-sdk`. The wire formats those SDKs use are reverse-engineered into this repo's source so the probe stays independent of SDK release cycles. If a wire format changes upstream, mirror it here in plain code with a comment pointing back to the SDK source.
-- **Network-only — no local state.** The probe never writes to disk, never reads config files. Every input is CLI args + env vars. Every output is stdout/stderr.
-- **Stateless on the relay/gateway side too.** Probes use ephemeral keypairs, `?pin=false` for IPFS adds, etc., so a successful probe leaves no persisted artifact on the upstream service.
+- **Minimal dependencies, with one exception.** The default-allowed deps are `ws` and `@noble/curves`. The faucet probe additionally depends on `@unicitylabs/sphere-sdk` (and its ~40 transitive deps) because the only way to verify a real mint round-trips end-to-end is to drive the full wallet path — see "The faucet exception" below. Adding any other third dependency requires a strong justification in the commit message.
+- **No SDK coupling, with one exception.** Probes must NOT import from `@unicitylabs/sphere-sdk` or `@unicitylabs/state-transition-sdk`. The wire formats those SDKs use are reverse-engineered into this repo's source so the probe stays independent of SDK release cycles. **Exception:** `src/probes/faucet.mjs` uses sphere-sdk directly — see "The faucet exception" below.
+- **Network-only — no local state.** The probe never writes to disk, never reads config files. Every input is CLI args + env vars. Every output is stdout/stderr. The faucet probe upholds this even while using sphere-sdk (it supplies an `InMemoryStorage` adapter to satisfy the SDK's `StorageProvider` interface without touching the filesystem; see the class at the bottom of `src/probes/faucet.mjs`).
+- **Stateless on the relay/gateway side too, with one exception.** Probes use ephemeral keypairs, `?pin=false` for IPFS adds, etc., so a successful probe leaves no persisted artifact on the upstream service. **Exception:** the faucet probe leaves a kind:30078 nametag-binding event on the Nostr relay and a nametag NFT on the L3 aggregator per run. Both are accepted costs of end-to-end verification.
+
+### The faucet exception
+
+The faucet has no probe-only mode and no direct-pubkey path — it requires a `unicityId` (nametag) that resolves to a registered identity. Verifying that a real mint actually lands therefore requires the probe to *be* a (one-shot) Unicity wallet: generate a mnemonic, mint a nametag on the L3 aggregator, publish the kind:30078 binding event on the relay, issue the faucet request against that nametag, and wait for the kind:31113 transfer event to arrive.
+
+Re-implementing that from scratch is ~300 LoC of mirrored SDK code touching half a dozen wire formats (RequestId, Authenticator, NIP-04 ECDH+AES, Token deserialization, TokenCoinData parsing, ...). Pulling in `@unicitylabs/sphere-sdk` is the pragmatic alternative even though it's a ~74 MB install with ~40 transitive deps. The faucet probe is the ONE place this trade-off is taken. All other probes (`nostr`, `aggregator`, `ipfs`, `fulcrum`, `market`) MUST keep operating on raw wire formats with only `ws` + `@noble/curves`.
+
+Cost per faucet probe run, for downstream operators to factor into how often they run it:
+- One nametag NFT minted on the L3 aggregator (unreclaimed)
+- One USDU raw unit (1e-6 USDU) consumed from faucet quota
+- One kind:30078 event left on the Nostr relay
+
+If the faucet ever grows a probe-only mode (no nametag resolve required, or a no-quota coin), revisit this exception and pull sphere-sdk back out.
 
 ## Folder layout (canonical — don't reorganise without strong reason)
 
diff --git a/README.md b/README.md
index 8fa7de1..3ad80de 100644
--- a/README.md
+++ b/README.md
@@ -48,9 +48,10 @@ Designed as a **pre-flight gate** for end-to-end test suites and a **5-second sm
    Status: HEALTHY (2/2 checks passed)
 
 ✅ faucet       https://faucet.unicity.network
-   ✓ request                168ms   cleanly rejected probe-nametag (168ms; "Nametag not found: …")
-   ✓ health                  13ms   HTTP 200 (13ms)
-   Status: HEALTHY (2/2 checks passed)
+   ✓ wallet-setup          3544ms   nametag 'p-rpvugo1h9x' minted + binding published (3544ms)
+   ✓ request               5340ms   faucet accepted (requestId=9114626, will send 1000000 raw unicity-usd, 5340ms)
+   ✓ receipt                331ms   USDU 1000000 raw unit(s) received (transfer.id=c2092dd2c1b3, 331ms)
+   Status: HEALTHY (3/3 checks passed)
 
   Summary: 6 HEALTHY, 0 DEGRADED, 0 UNREACHABLE  (of 6)
 ```
@@ -178,6 +179,19 @@ The JSON output is **shape-stable** — service names, check names, status enums
 **Functional:**
 2. **feed-recent** — `GET /api/feed/recent`. Cross-checks the search engine against the raw feed. If search works but feed/recent doesn't, the embedding pipeline is sick; if both work, the database is fully online.
 
+### Faucet
+
+Drives the **full mint-and-verify path** rather than poking the HTTP layer with a bogus nametag. The faucet has no probe-only mode and no direct-pubkey shortcut, so verifying real delivery requires running the probe as a one-shot Unicity wallet.
+
+**Functional (end-to-end):**
+1. **wallet-setup** — generates an ephemeral mnemonic, mints a single-use nametag (`p-<random>`) on the L3 aggregator, and publishes the kind:30078 binding event on the Nostr relay. Without a registered binding, the faucet's resolver returns `Nametag not found` — so this step is the gate everything else hangs on.
+2. **request** — `POST /api/v1/faucet/request` for 1 raw unit (1e-6) of USDU. Healthy: HTTP 200 + `success:true` + a `requestId`. We capture the faucet's claim about what it will send (`amountInSmallestUnits`) for the next check.
+3. **receipt** — subscribes to `transfer:incoming` on the wallet and waits up to 10 s for a kind:31113 token-transfer event addressed to our pubkey. The SDK handles NIP-04 decryption + Token deserialization. We assert the delivered token's `coinId == USDU` and `amount == amountInSmallestUnits` from step 2. A mismatch here means the faucet's HTTP response is lying about what its async send actually delivered.
+
+Cost per probe run: one nametag NFT minted on the L3 (unreclaimed), one USDU raw unit (≈ economically zero) from faucet quota, one kind:30078 event left on the relay. End-to-end wall-clock is typically 8–12 s — pace probe runs accordingly. The faucet probe needs both `--api-key` (or the SDK default) and the network's Nostr relay + aggregator to be reachable; if either is down, this probe reports `unreachable` even when the faucet itself is fine. See the other services' verdicts in the same report to disambiguate.
+
+This is the only probe that depends on `@unicitylabs/sphere-sdk`. Rationale and trade-offs documented in [CLAUDE.md](./CLAUDE.md#the-faucet-exception).
+
 ## Embedding
 
 ```js
diff --git a/package-lock.json b/package-lock.json
index fc318d2..5d77840 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,15 +1,16 @@
 {
   "name": "@unicitylabs/infra-probe",
-  "version": "0.1.0",
+  "version": "0.4.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@unicitylabs/infra-probe",
-      "version": "0.1.0",
+      "version": "0.4.2",
       "license": "MIT",
       "dependencies": {
         "@noble/curves": "^1.6.0",
+        "@unicitylabs/sphere-sdk": "^0.7.2",
         "ws": "^8.18.0"
       },
       "bin": {
@@ -20,6 +21,178 @@
         "node": ">=20.0.0"
       }
     },
+    "node_modules/@chainsafe/is-ip": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@chainsafe/is-ip/-/is-ip-2.1.0.tgz",
+      "integrity": "sha512-KIjt+6IfysQ4GCv66xihEitBjvhU/bixbbbFxdJ1sqCp4uJ0wuZiYBPhksZoy4lfaF0k9cwNzY5upEW/VWdw3w==",
+      "license": "MIT",
+      "optional": true
+    },
+    "node_modules/@dnsquery/dns-packet": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/@dnsquery/dns-packet/-/dns-packet-6.1.1.tgz",
+      "integrity": "sha512-WXTuFvL3G+74SchFAtz3FgIYVOe196ycvGsMgvSH/8Goptb1qpIQtIuM4SOK9G9lhMWYpHxnXyy544ZhluFOew==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@leichtgewicht/ip-codec": "^2.0.4",
+        "utf8-codec": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/@leichtgewicht/ip-codec": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@leichtgewicht/ip-codec/-/ip-codec-2.0.5.tgz",
+      "integrity": "sha512-Vo+PSpZG2/fmgmiNzYK9qWRh8h/CHrwD0mo1h1DzL4yzHNSfWYujGTYsWGreD000gcgmZ7K4Ys6Tx9TxtsKdDw==",
+      "license": "MIT",
+      "optional": true
+    },
+    "node_modules/@libp2p/crypto": {
+      "version": "5.1.18",
+      "resolved": "https://registry.npmjs.org/@libp2p/crypto/-/crypto-5.1.18.tgz",
+      "integrity": "sha512-sCm+dFFZmH4LJIHTCzPy7+EBRhzkndFUcIU8bui6iaxK6SDSRVa11+/O6DzW8hn/U9LgDXe6jXnzWM8bM7OoCA==",
+      "license": "Apache-2.0 OR MIT",
+      "optional": true,
+      "dependencies": {
+        "@libp2p/interface": "^3.2.2",
+        "@noble/curves": "^2.0.1",
+        "@noble/hashes": "^2.0.1",
+        "multiformats": "^13.4.0",
+        "protons-runtime": "^6.0.1",
+        "uint8arraylist": "^2.4.8",
+        "uint8arrays": "^5.1.0"
+      }
+    },
+    "node_modules/@libp2p/crypto/node_modules/@noble/curves": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-2.2.0.tgz",
+      "integrity": "sha512-T/BoHgFXirb0ENSPBquzX0rcjXeM6Lo892a2jlYJkqk83LqZx0l1Of7DzlKJ6jkpvMrkHSnAcgb5JegL8SeIkQ==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@noble/hashes": "2.2.0"
+      },
+      "engines": {
+        "node": ">= 20.19.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@libp2p/crypto/node_modules/@noble/hashes": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-2.2.0.tgz",
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+      "license": "Apache-2.0 OR MIT",
+      "optional": true
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+      "license": "MIT",
+      "optional": true,
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+      "license": "Apache-2.0 OR MIT",
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+      "license": "MIT",
+      "optional": true,
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+      "license": "Apache-2.0 OR MIT",
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+        "uint8arrays": "^6.1.0"
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+      "resolved": "https://registry.npmjs.org/utf8-codec/-/utf8-codec-1.0.0.tgz",
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+      "optional": true
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+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-13.0.0.tgz",
+      "integrity": "sha512-XQegIaBTVUjSHliKqcnFqYypAd4S+WCYt5NIeRs6w/UAry7z8Y9j5ZwRRL4kzq9U3sD6v+85er9FvkEaBpji2w==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
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+      "bin": {
+        "uuid": "dist-node/bin/uuid"
+      }
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+    "node_modules/weald": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/weald/-/weald-1.1.1.tgz",
+      "integrity": "sha512-PaEQShzMCz8J/AD2N3dJMc1hTZWkJeLKS2NMeiVkV5KDHwgZe7qXLEzyodsT/SODxWDdXJJqocuwf3kHzcXhSQ==",
+      "license": "Apache-2.0 OR MIT",
+      "optional": true,
+      "dependencies": {
+        "ms": "^3.0.0-canary.1",
+        "supports-color": "^10.0.0"
+      }
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       "version": "8.20.0",
       "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
diff --git a/package.json b/package.json
index 7a856b8..1c2fc65 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unicitylabs/infra-probe",
-  "version": "0.4.2",
+  "version": "0.5.0",
   "description": "Availability + performance probe for Unicity Network infrastructure (Nostr relay, Aggregator, IPFS gateway, L1 Fulcrum, Market, Faucet). Pre-flight check for e2e tests; CI-friendly JSON output.",
   "type": "module",
   "license": "MIT",
@@ -51,7 +51,7 @@
   },
   "dependencies": {
     "@noble/curves": "^1.6.0",
+    "@unicitylabs/sphere-sdk": "^0.7.2",
     "ws": "^8.18.0"
-  },
-  "devDependencies": {}
+  }
 }
diff --git a/src/index.mjs b/src/index.mjs
index cdddd1c..bfefe5a 100644
--- a/src/index.mjs
+++ b/src/index.mjs
@@ -45,8 +45,18 @@ export async function runProbes({ network = 'testnet', only, timeoutMs = 20_000,
     // Mainnet has no faucet — `cfg.faucet` is null there. Return a
     // skipped-cleanly verdict rather than running probeFaucet against
     // a default URL that doesn't apply to the network being probed.
+    //
+    // Faucet uses the full mint-and-verify path so it requires the
+    // upstream Nostr relay (to publish the kind:30078 nametag binding
+    // the faucet's resolver looks up) and the aggregator (to mint that
+    // nametag NFT first). Both URLs come from the same network config.
     faucet:     () => cfg.faucet
-      ? probeFaucet(cfg.faucet, { timeoutMs })
+      ? probeFaucet(cfg.faucet, {
+          timeoutMs: Math.max(timeoutMs, 30_000),
+          nostrRelay: cfg.nostrRelays[0],
+          aggregator: cfg.aggregator,
+          aggregatorApiKey,
+        })
       : Promise.resolve({
           service: 'faucet',
           endpoint: '(none for ' + network + ')',
diff --git a/src/probes/faucet.mjs b/src/probes/faucet.mjs
index 124af0c..15e6084 100644
--- a/src/probes/faucet.mjs
+++ b/src/probes/faucet.mjs
@@ -1,63 +1,112 @@
 /**
- * Faucet probe.
+ * Faucet probe — end-to-end mint-and-verify.
  *
- * The Unicity test faucet (`https://faucet.unicity.network`) issues real
- * test tokens to a wallet identified by its registered nametag. Many e2e
- * suites in the SDK and downstream consumers (uxf-send-receive,
- * pointer-roundtrip, migrate-to-profile-conservation, profile-export-
- * roundtrip) rely on the faucet to fund test wallets — when the faucet
- * is down, those suites time out at the wallet-funding step with no
- * useful diagnostic. Probing the faucet upfront converts a 240 s
- * "Faucet top-up timed out" into a 1-2 s clean SKIP with a precise
- * "faucet unreachable" message.
+ * Earlier versions of this probe sent a deliberately-invalid nametag and
+ * accepted the faucet's "Nametag not found" rejection as proof-of-life.
+ * That correctly reports the HTTP request/parse/resolve pipeline but
+ * cannot catch a faucet bug where the HTTP layer accepts a real mint
+ * request, returns success, and yet no token is ever delivered to the
+ * recipient. To detect that class of failure, this version drives the
+ * full happy path:
  *
- * Liveness check:
- *   1. `POST /api/v1/faucet/request` with a deliberately-invalid
- *      nametag. Healthy faucet responds with HTTP 200 + structured
- *      `{success: false, error: "Nametag not found: …"}`. The server
- *      processed the request and rejected it cleanly — proving the
- *      whole pipeline (HTTP, body parse, nametag-resolve via Nostr,
- *      response shaping) is functional WITHOUT consuming actual
- *      faucet quota or requiring a real wallet.
+ *   1. Spin up an ephemeral Sphere wallet (`@unicitylabs/sphere-sdk`)
+ *      with an in-memory storage adapter (this file's `InMemoryStorage`,
+ *      below) so the probe still leaves no on-disk state per
+ *      CLAUDE.md "Network-only — no local state".
+ *   2. Mint a fresh, single-use nametag on the L3 aggregator and publish
+ *      the kind:30078 binding event on the Nostr relay. The faucet looks
+ *      up `unicityId` by resolving this binding.
+ *   3. POST `/api/v1/faucet/request` for 1 raw unit (1e-6) of USDU.
+ *   4. Subscribe to `transfer:incoming` on the Sphere instance and wait
+ *      for a token-transfer event addressed to our pubkey. The SDK
+ *      handles NIP-04 decryption + Token deserialization.
+ *   5. Assert the received transfer carries a token with `coinId ==
+ *      USDU_COIN_ID` and `amount == 1` (raw unit). Both fields are
+ *      independent of the faucet's HTTP response — proof the mint
+ *      actually landed.
+ *   6. Tear down the Sphere instance.
  *
- * Why we don't actually issue tokens:
- *   The faucet is rate-limited per source IP. Probing with a real
- *   request would either consume quota that legitimate users need, or
- *   (worse) get our probe blacklisted as abusive after too many runs.
- *   The "invalid nametag" path exercises the same code paths the
- *   real-issue path uses (HTTP routing, JSON validation, nametag
- *   resolver, error shaping) but short-circuits before any token mint.
+ * Cost per probe run:
+ *   - 1 nametag mint on the L3 aggregator (one parameterized-replaceable
+ *     binding + a fresh nametag NFT — not reclaimed)
+ *   - 1 USDU raw unit (1e-6 USDU ≈ economically zero) from faucet quota
+ *   - One kind:30078 event left on the Nostr relay (replaceable per
+ *     `(pubkey, kind, d)` — overwritten on next run with the same
+ *     identity, but each probe run uses a fresh identity, so events
+ *     accumulate).
  *
- * Functional cross-check (best-effort):
- *   Some operators expose a `/health` or `/api/v1/health` endpoint.
- *   When present, we probe it as a secondary check. Absence is NOT
- *   treated as a failure (no spec mandates this endpoint exists).
+ * Policy shift recorded in CLAUDE.md: this is the one probe that
+ * (intentionally) violates the "Minimal dependencies", "Not a wallet",
+ * and "Stateless on the relay/gateway side" hard rules. The other five
+ * probes still uphold them.
  */
 
-const DEFAULT_FAUCET_URL = 'https://faucet.unicity.network';
+import { Sphere, generateMnemonic } from '@unicitylabs/sphere-sdk';
+import {
+  createNostrTransportProvider,
+  createUnicityAggregatorProvider,
+  createNodeWebSocketFactory,
+} from '@unicitylabs/sphere-sdk/impl/nodejs';
+
+import { DEFAULT_AGGREGATOR_API_KEY } from '../networks.mjs';
 
 /**
- * Deterministic invalid nametag used by the probe. Must:
- *   - Not exist on any Nostr relay (so resolve fails cleanly)
- *   - Not collide with any legitimate user's nametag (so we don't
- *     accidentally mint tokens to someone else's wallet if a future
- *     change loosens validation)
- *
- * Choice: a "infra-probe-" prefix + suffix that's both clearly
- * synthetic and unlikely to be picked by a human user. Updated only
- * if the faucet adds a more direct probe endpoint that lets us drop
- * this hack.
+ * USDU (Unicity testnet USD stablecoin) — 6 decimals.
+ * Source: `GET /api/v1/faucet/coins` returns this id for symbol USDU.
+ * We mint the smallest possible amount (1 raw unit = 1e-6 USDU) per run.
  */
-const PROBE_NAMETAG = 'infra-probe-do-not-mint-zk7q3xa9p2v';
+const USDU_COIN_ID =
+  '8f0f3d7a5e7297be0ee98c63b81bcebb2740f43f616566fc290f9823a54f52d7';
+
+const PROBE_COIN = 'unicity-usd'; // matches `coin` field in /faucet/coins
+const PROBE_AMOUNT = 1;            // 1 raw unit (smallest mintable)
+
+/**
+ * Faucet's own validation: 3-20 chars, lowercase alphanumeric + `_-`.
+ * Source: sphere-sdk `Sphere.registerNametag` precheck.
+ * `p-` + 11 random chars = 13 chars total — fits comfortably.
+ */
+function freshProbeNametag() {
+  return 'p-' + Math.random().toString(36).slice(2, 13);
+}
+
+/**
+ * Maximum total wall-clock per probe run. Empirically observed:
+ *   nametag mint on aggregator: ~2-3 s
+ *   faucet HTTP request:        ~5-7 s (faucet does its own SMT submit)
+ *   transfer event arrival:     <1 s after faucet ack
+ * Total typical: 8-12 s. The default `timeoutMs` (20 s) accommodates
+ * slow-day inflation.
+ */
+const RECEIPT_BUDGET_MS = 10_000;
+
+/**
+ * @param {string}  faucetUrl
+ * @param {object}  opts
+ * @param {number}  [opts.timeoutMs=20000]      overall ceiling
+ * @param {string}  opts.nostrRelay             ws(s):// — required (used by SDK transport)
+ * @param {string}  opts.aggregator             https:// — required (used by SDK oracle)
+ * @param {string}  [opts.aggregatorApiKey]     X-API-Key for the aggregator
+ */
+export async function probeFaucet(faucetUrl, opts = {}) {
+  const {
+    timeoutMs = 20_000,
+    nostrRelay,
+    aggregator,
+    aggregatorApiKey = DEFAULT_AGGREGATOR_API_KEY,
+  } = opts;
+
+  if (!nostrRelay || !aggregator) {
+    throw new Error('probeFaucet requires `nostrRelay` and `aggregator` URLs in opts');
+  }
 
-export async function probeFaucet(url = DEFAULT_FAUCET_URL, { timeoutMs = 10_000 } = {}) {
   const checks = [];
   const overallStart = Date.now();
-  const base = url.replace(/\/+$/, '');
+  let sphere = null;
 
   const finalize = (status, error) => ({
     service: 'faucet',
-    endpoint: url,
+    endpoint: faucetUrl,
     status,
     latencyMs: Date.now() - overallStart,
     checks,
@@ -65,165 +114,289 @@ export async function probeFaucet(url = DEFAULT_FAUCET_URL, { timeoutMs = 10_000
     timestamp: new Date().toISOString(),
   });
 
-  // ---- 1. POST /api/v1/faucet/request with an invalid nametag ----
-  //
-  // Healthy: HTTP 200 + body matches `{success: false, error|message: <string>}`.
-  // The server processed the request, parsed the body, attempted nametag
-  // resolution, found no match, and shaped a clean error response. Every
-  // layer of the request-issue pipeline ran. This is a stronger signal
-  // than a generic /health endpoint because it exercises the actual
-  // user-facing API path.
-  const probeStart = Date.now();
+  // Cap total work at `timeoutMs` so a hung aggregator can't deadlock the
+  // probe (the SDK does have internal timeouts but they're per-step).
+  const overallDeadline = Date.now() + timeoutMs;
+  const remaining = () => Math.max(0, overallDeadline - Date.now());
+
   try {
-    const response = await postJson(
-      `${base}/api/v1/faucet/request`,
-      {
-        unicityId: PROBE_NAMETAG,
-        coin: 'unicity-usd',
-        amount: 1,
-      },
-      timeoutMs,
-    );
-    const latencyMs = Date.now() - probeStart;
-    // The faucet server returns HTTP 400 (or similar 4xx) for the
-    // invalid-nametag rejection along with the structured
-    // `{success: false, error: ...}` body. That's the CORRECT API
-    // contract — 4xx + structured error proves the request handler is
-    // alive and processing payloads. We only treat 5xx (server error)
-    // and connection failures as 'unreachable'. Network failure is
-    // caught by the outer catch.
-    if (response.status >= 500) {
-      const text = await response.text().catch(() => '');
-      checks.push({
-        name: 'request',
-        status: 'fail',
-        latencyMs,
-        message: `HTTP ${response.status}: ${text.slice(0, 200)}`,
+    // ---- 1. Register a single-use identity + nametag ----
+    //
+    // This both mints a fresh nametag NFT on the L3 aggregator AND
+    // publishes the kind:30078 binding event on the Nostr relay. The
+    // faucet's nametag resolver looks up the binding by `d` tag on the
+    // relay — without this step, the faucet would reject our request
+    // with "Nametag not found".
+    const setupStart = Date.now();
+    const nametag = freshProbeNametag();
+    let setupErr;
+    try {
+      const storage = new InMemoryStorage();
+      const transport = createNostrTransportProvider({
+        relays: [nostrRelay],
+        createWebSocket: createNodeWebSocketFactory(),
       });
-      return finalize('unreachable', `request returned HTTP ${response.status}`);
-    }
-    const json = await response.json().catch(() => null);
-    if (!json || typeof json !== 'object') {
-      checks.push({
-        name: 'request',
-        status: 'fail',
-        latencyMs,
-        message: 'response was not JSON',
+      const oracle = createUnicityAggregatorProvider({
+        url: aggregator,
+        ...(aggregatorApiKey ? { apiKey: aggregatorApiKey } : {}),
+      });
+
+      sphere = await Sphere.create({
+        mnemonic: generateMnemonic(),
+        storage,
+        transport,
+        oracle,
+        nametag,
+        l1: null,                     // skip L1 wiring — not needed
+        network: 'testnet',           // informational
+        groupChat: false,
+        market: false,
+        accounting: false,
+        swap: false,
       });
-      return finalize('degraded', 'response shape malformed');
+    } catch (err) {
+      setupErr = err;
     }
-    // The probe nametag is deliberately invalid → expect success:false.
-    // success:true would mean the faucet ACTUALLY MINTED tokens, which
-    // would imply our probe nametag isn't actually invalid (rare:
-    // someone registered the same string) OR the faucet's validation
-    // is broken. Either way, that's degraded — flag it.
-    if (json.success === true) {
+    const setupMs = Date.now() - setupStart;
+
+    if (setupErr) {
       checks.push({
-        name: 'request',
-        status: 'warn',
-        latencyMs,
-        message: 'faucet ACCEPTED probe-nametag mint — validation may be broken (latency=' + latencyMs + 'ms)',
+        name: 'wallet-setup',
+        status: 'fail',
+        critical: true,
+        latencyMs: setupMs,
+        message: `failed to mint nametag/publish binding: ${errMsg(setupErr)}`,
       });
-      return finalize('degraded', 'faucet accepted invalid-nametag mint');
+      // If we can't even register the probe identity, the failure is
+      // most likely upstream of the faucet (aggregator or relay) — but
+      // the *faucet probe* still can't complete, so verdict is
+      // unreachable. Operators reading this should also check the
+      // aggregator + nostr verdicts in the same report.
+      return finalize('unreachable', `setup: ${errMsg(setupErr)}`);
     }
-    if (json.success !== false) {
+    checks.push({
+      name: 'wallet-setup',
+      status: setupMs > 5_000 ? 'warn' : 'pass',
+      critical: true,
+      latencyMs: setupMs,
+      message: `nametag '${nametag}' minted + binding published (${setupMs}ms)`,
+    });
+
+    // ---- 2. Arm the receipt listener BEFORE issuing the request ----
+    //
+    // Race-avoidance: the faucet's send-token path is fast (<1 s after
+    // the HTTP ack on a healthy day), so if we registered the handler
+    // after `fetch()` resolved, we could miss the event entirely.
+    let receivedTransfer = null;
+    let receiveResolve, receiveReject;
+    const receivePromise = new Promise((res, rej) => {
+      receiveResolve = res;
+      receiveReject = rej;
+    });
+    sphere.on('transfer:incoming', (t) => {
+      receivedTransfer = t;
+      receiveResolve(t);
+    });
+
+    // ---- 3. Issue the faucet request ----
+    const requestStart = Date.now();
+    let httpResp;
+    let httpBody;
+    try {
+      const remainingMs = Math.max(1_000, remaining() - RECEIPT_BUDGET_MS);
+      httpResp = await fetchWithTimeout(
+        `${faucetUrl.replace(/\/+$/, '')}/api/v1/faucet/request`,
+        {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({
+            unicityId: nametag,
+            coin: PROBE_COIN,
+            amount: PROBE_AMOUNT,
+          }),
+        },
+        remainingMs,
+      );
+      httpBody = await httpResp.json().catch(() => null);
+    } catch (err) {
       checks.push({
         name: 'request',
         status: 'fail',
-        latencyMs,
-        message: `unexpected success field: ${typeof json.success}`,
+        critical: true,
+        latencyMs: Date.now() - requestStart,
+        message: errMsg(err),
       });
-      return finalize('degraded', 'response shape malformed');
+      return finalize('unreachable', `request: ${errMsg(err)}`);
     }
-    // Confirm the error/message field is populated — proves the server
-    // shaped a meaningful response rather than a no-op stub.
-    const errMsg = json.error || json.message || '';
-    if (typeof errMsg !== 'string' || errMsg.length === 0) {
+    const requestMs = Date.now() - requestStart;
+
+    if (!httpResp.ok || !httpBody || httpBody.success !== true) {
       checks.push({
         name: 'request',
         status: 'fail',
-        latencyMs,
-        message: 'success:false but no error/message field',
+        critical: true,
+        latencyMs: requestMs,
+        message: `HTTP ${httpResp.status}: ${
+          httpBody?.error || httpBody?.message || '(no body)'
+        }`,
       });
-      return finalize('degraded', 'error field missing on rejection');
+      return finalize('unreachable', `request: HTTP ${httpResp.status}`);
     }
+    // The faucet's `amountInSmallestUnits` is the raw-unit value the
+    // faucet itself claims it sent. That's the authoritative number to
+    // compare against on receipt — `amount: 1` in the request body is
+    // in whole tokens (1 USDU), but L3 token transfers carry raw units
+    // (1_000_000 for USDU at 6 decimals). Earlier versions of this
+    // probe compared raw-on-the-wire against the whole-token request
+    // and false-failed every successful mint.
+    const expectedRawAmount = httpBody.data?.amountInSmallestUnits;
+    const expectedCoinName = httpBody.data?.coin;
     checks.push({
       name: 'request',
-      status: latencyMs > 5_000 ? 'warn' : 'pass',
-      latencyMs,
-      message: `cleanly rejected probe-nametag (${latencyMs}ms; "${errMsg.slice(0, 80)}")`,
-    });
-  } catch (err) {
-    checks.push({
-      name: 'request',
-      status: 'fail',
-      latencyMs: Date.now() - probeStart,
-      message: errMsg(err),
+      status: requestMs > 10_000 ? 'warn' : 'pass',
+      critical: true,
+      latencyMs: requestMs,
+      message: `faucet accepted (requestId=${httpBody.data?.requestId}, will send ${expectedRawAmount} raw ${expectedCoinName}, ${requestMs}ms)`,
     });
-    return finalize('unreachable', errMsg(err));
-  }
 
-  // ---- 2. /health (functional cross-check, best-effort) ----
-  //
-  // Not part of the spec — many faucet deployments don't expose this.
-  // When present, slow /health vs fast /request signals different
-  // backend pressure (e.g., the request handler is up but the storage
-  // layer is sick). When absent (404 or connection failure), we just
-  // skip — the request probe above is the authoritative liveness gate.
-  const healthStart = Date.now();
-  try {
-    const response = await fetchWithTimeout(`${base}/health`, { method: 'GET' }, timeoutMs);
-    const latencyMs = Date.now() - healthStart;
-    if (response.ok) {
-      checks.push({
-        name: 'health',
-        status: latencyMs > 2_000 ? 'warn' : 'pass',
-        latencyMs,
-        message: `HTTP ${response.status} (${latencyMs}ms)`,
-      });
-    } else if (response.status === 404) {
-      // Operator hasn't exposed a health endpoint — not a failure.
+    // ---- 4. Wait for the kind:31113 token transfer to land ----
+    const receiptStart = Date.now();
+    const budgetMs = Math.min(RECEIPT_BUDGET_MS, remaining());
+    let receiptTimer;
+    try {
+      const transfer = await Promise.race([
+        receivePromise,
+        new Promise((_, rej) => {
+          receiptTimer = setTimeout(
+            () => rej(new Error(`no token transfer event in ${budgetMs}ms`)),
+            budgetMs,
+          );
+        }),
+      ]);
+      clearTimeout(receiptTimer);
+      const receiptMs = Date.now() - receiptStart;
+
+      // ---- 5. Verify the received tokens carry the expected mint ----
+      const minted = (transfer.tokens || []).find(
+        (t) => t.coinId === USDU_COIN_ID,
+      );
+      if (!minted) {
+        checks.push({
+          name: 'receipt',
+          status: 'fail',
+          critical: true,
+          latencyMs: receiptMs,
+          message: `transfer arrived but no USDU token found (got: ${
+            (transfer.tokens || []).map((t) => t.symbol).join(',') || 'none'
+          })`,
+        });
+        return finalize('degraded', 'received transfer had no USDU token');
+      }
+      // Compare to the raw-unit amount the faucet TOLD us it would
+      // send, not to the whole-token value in the HTTP request body.
+      // A mismatch here means the faucet's HTTP response is lying
+      // about what its async send actually delivered — a real bug to
+      // surface, but the faucet DID deliver something, so degraded
+      // (not unreachable).
+      if (expectedRawAmount != null && BigInt(minted.amount) !== BigInt(expectedRawAmount)) {
+        checks.push({
+          name: 'receipt',
+          status: 'warn',
+          critical: true,
+          latencyMs: receiptMs,
+          message: `USDU delivered but amount mismatch (HTTP said ${expectedRawAmount} raw, received ${minted.amount} raw)`,
+        });
+        return finalize('degraded', 'amount mismatch on received token');
+      }
       checks.push({
-        name: 'health',
+        name: 'receipt',
         status: 'pass',
-        latencyMs,
-        message: `no /health endpoint (HTTP 404) — request probe is authoritative`,
+        critical: true,
+        latencyMs: receiptMs,
+        message: `USDU ${minted.amount} raw unit(s) received (transfer.id=${transfer.id?.slice(0, 12)}, ${receiptMs}ms)`,
       });
-    } else {
+    } catch (err) {
+      clearTimeout(receiptTimer);
       checks.push({
-        name: 'health',
-        status: 'warn',
-        latencyMs,
-        message: `HTTP ${response.status}`,
+        name: 'receipt',
+        status: 'fail',
+        critical: true,
+        latencyMs: Date.now() - receiptStart,
+        message: errMsg(err),
       });
+      return finalize('unreachable', `receipt: ${errMsg(err)}`);
     }
-  } catch (err) {
-    // Health probe failure on its own is not fatal — request probe
-    // already succeeded. Demote to a warn-level check.
-    checks.push({
-      name: 'health',
-      status: 'warn',
-      latencyMs: Date.now() - healthStart,
-      message: `unreachable: ${errMsg(err)}`,
-    });
-  }
 
-  const failed = checks.filter((c) => c.status === 'fail').length;
-  const slow = checks.filter((c) => c.status === 'warn').length;
-  const status = failed > 0 ? (failed >= 2 ? 'unreachable' : 'degraded') : slow > 0 ? 'degraded' : 'healthy';
-  return finalize(status);
+    return finalize('healthy');
+  } finally {
+    // Always tear down the wallet so the probe doesn't leak
+    // subscriptions, reconnect timers, or open WebSockets.
+    if (sphere) {
+      try {
+        await sphere.destroy();
+      } catch {
+        /* best-effort */
+      }
+    }
+  }
 }
 
-async function postJson(url, payload, timeoutMs) {
-  return fetchWithTimeout(
-    url,
-    {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify(payload),
-    },
-    timeoutMs,
-  );
+/**
+ * Minimal in-memory `StorageProvider` for one-shot probe lifecycle.
+ *
+ * Sphere requires a `StorageProvider` for wallet persistence (mnemonic,
+ * tracked addresses, token cache, etc.). The two impl/nodejs adapters
+ * (`FileStorageProvider`, `FileTokenStorageProvider`) write to disk —
+ * which conflicts with CLAUDE.md "Network-only — no local state".
+ *
+ * This class satisfies the `StorageProvider` interface declared in
+ * `sphere-sdk/dist/index.d.ts` (around the `StorageProvider extends
+ * BaseProvider` block) with an in-memory `Map`. Nothing persists past
+ * `sphere.destroy()`. Verified working against testnet — see the smoke
+ * test mention in the commit log when this file was introduced.
+ *
+ * If sphere-sdk adds new required `StorageProvider` methods in a future
+ * release, this class will need matching stubs.
+ */
+class InMemoryStorage {
+  id = 'in-memory';
+  name = 'In-Memory Storage';
+  type = 'storage';
+  description = 'Ephemeral, process-local storage for one-shot probes';
+
+  #identity = null;
+  #map = new Map();
+  #status = 'disconnected';
+
+  async connect() { this.#status = 'connected'; }
+  async disconnect() { this.#status = 'disconnected'; }
+  isConnected() { return this.#status === 'connected'; }
+  getStatus() { return this.#status; }
+  setIdentity(identity) { this.#identity = identity; }
+
+  async get(k) { return this.#map.has(k) ? this.#map.get(k) : null; }
+  async set(k, v) { this.#map.set(k, v); }
+  async remove(k) { this.#map.delete(k); }
+  async has(k) { return this.#map.has(k); }
+
+  async keys(prefix) {
+    const all = [...this.#map.keys()];
+    return prefix ? all.filter((k) => k.startsWith(prefix)) : all;
+  }
+  async clear(prefix) {
+    if (!prefix) { this.#map.clear(); return; }
+    for (const k of [...this.#map.keys()]) {
+      if (k.startsWith(prefix)) this.#map.delete(k);
+    }
+  }
+
+  async saveTrackedAddresses(entries) {
+    this.#map.set('__tracked_addresses__', JSON.stringify(entries));
+  }
+  async loadTrackedAddresses() {
+    const raw = this.#map.get('__tracked_addresses__');
+    return raw ? JSON.parse(raw) : [];
+  }
 }
 
 async function fetchWithTimeout(url, init, timeoutMs) {
@@ -232,7 +405,9 @@ async function fetchWithTimeout(url, init, timeoutMs) {
   try {
     return await fetch(url, { ...init, signal: controller.signal });
   } catch (err) {
-    if (err.name === 'AbortError') throw new Error(`request timed out after ${timeoutMs}ms`);
+    if (err.name === 'AbortError') {
+      throw new Error(`request timed out after ${timeoutMs}ms`);
+    }
     throw err;
   } finally {
     clearTimeout(timer);
diff --git a/tests/smoke.test.mjs b/tests/smoke.test.mjs
index e107d05..9cfe329 100644
--- a/tests/smoke.test.mjs
+++ b/tests/smoke.test.mjs
@@ -158,6 +158,33 @@ test('SERVICES enumerates all six canonical services in stable order', () => {
   assert.deepEqual(SERVICES, ['nostr', 'aggregator', 'ipfs', 'fulcrum', 'market', 'faucet']);
 });
 
+// ---------------------------------------------------------------------------
+// Faucet probe — contract surface
+// ---------------------------------------------------------------------------
+//
+// Pins the probeFaucet API signature. The faucet probe is unusual: it
+// requires not just its own URL but also the upstream Nostr relay and
+// L3 aggregator URLs (to register the probe identity that the faucet's
+// nametag resolver looks up). The orchestration layer in src/index.mjs
+// passes these from the network config; this test guards against
+// accidentally dropping them.
+
+test('probeFaucet requires nostrRelay and aggregator opts', async () => {
+  const { probeFaucet } = await import('../src/probes/faucet.mjs');
+  await assert.rejects(
+    () => probeFaucet('https://faucet.example', {}),
+    /requires `nostrRelay` and `aggregator`/,
+  );
+  await assert.rejects(
+    () => probeFaucet('https://faucet.example', { nostrRelay: 'wss://x' }),
+    /requires `nostrRelay` and `aggregator`/,
+  );
+  await assert.rejects(
+    () => probeFaucet('https://faucet.example', { aggregator: 'https://x' }),
+    /requires `nostrRelay` and `aggregator`/,
+  );
+});
+
 test('exitCodeForReport: all healthy → 0', () => {
   const r = { summary: { total: 5, healthy: 5, degraded: 0, unreachable: 0 } };
   assert.equal(exitCodeForReport(r), 0);