diff --git a/dashboard/src/__tests__/clipboard-audit.test.ts b/dashboard/src/__tests__/clipboard-audit.test.ts
new file mode 100644
index 0000000..8a17c40
--- /dev/null
+++ b/dashboard/src/__tests__/clipboard-audit.test.ts
@@ -0,0 +1,43 @@
+import { readdirSync, readFileSync, statSync } from "fs";
+import { join, relative } from "path";
+import { describe, expect, it } from "vitest";
+
+const SRC_ROOT = join(process.cwd(), "dashboard", "src");
+const ALLOWED_CLIPBOARD_FILE = "lib/clipboard.ts";
+
+function listSourceFiles(dir: string): string[] {
+  const entries = readdirSync(dir);
+  const files: string[] = [];
+
+  for (const entry of entries) {
+    const fullPath = join(dir, entry);
+    const stat = statSync(fullPath);
+    if (stat.isDirectory()) {
+      if (entry === "__tests__") continue;
+      files.push(...listSourceFiles(fullPath));
+      continue;
+    }
+    if (/\.(ts|tsx)$/.test(entry)) {
+      files.push(fullPath);
+    }
+  }
+
+  return files;
+}
+
+describe("clipboard API usage audit", () => {
+  it("keeps direct clipboard APIs inside the shared fallback helper", () => {
+    const directClipboardUsers = listSourceFiles(SRC_ROOT)
+      .map((file) => ({
+        file: relative(SRC_ROOT, file).replace(/\\/g, "/"),
+        source: readFileSync(file, "utf8"),
+      }))
+      .filter(({ file, source }) =>
+        file !== ALLOWED_CLIPBOARD_FILE &&
+        (/navigator\.clipboard/.test(source) || /document\.execCommand/.test(source)),
+      )
+      .map(({ file }) => file);
+
+    expect(directClipboardUsers).toEqual([]);
+  });
+});
diff --git a/dashboard/src/__tests__/settings-tab.test.tsx b/dashboard/src/__tests__/settings-tab.test.tsx
index ca3e5b1..2a21bad 100644
--- a/dashboard/src/__tests__/settings-tab.test.tsx
+++ b/dashboard/src/__tests__/settings-tab.test.tsx
@@ -8,6 +8,14 @@ import { describe, it, expect, vi, beforeEach } from "vitest";
 import { SettingsTab } from "../components/tabs/settings-tab";
 import type { SettingsTabProps } from "../components/tabs/settings-tab";
 
+const { copyTextMock } = vi.hoisted(() => ({
+  copyTextMock: vi.fn().mockResolvedValue("ok" as const),
+}));
+
+vi.mock("../lib/clipboard", () => ({
+  copyText: copyTextMock,
+}));
+
 const RECIPIENT = {
   name: "Rosa Garcia",
   age: 78,
@@ -35,6 +43,11 @@ function buildProps(overrides: Partial<SettingsTabProps> = {}): SettingsTabProps
   };
 }
 
+beforeEach(() => {
+  copyTextMock.mockReset();
+  copyTextMock.mockResolvedValue("ok");
+});
+
 describe("SettingsTab — load from props (Issue #79)", () => {
   it("renders recipient name from props (not hardcoded)", () => {
     render(<SettingsTab {...buildProps()} />);
@@ -168,3 +181,26 @@ describe("SettingsTab — agent status (Issue #79)", () => {
     expect(onTogglePause).toHaveBeenCalledTimes(1);
   });
 });
+
+describe("SettingsTab — clipboard fallback (Issue #218)", () => {
+  it("shows a fallback toast when wallet copy fails", async () => {
+    const wallet = "GDSETTINGSWALLET123456789";
+    copyTextMock.mockResolvedValueOnce("failed");
+
+    render(
+      <SettingsTab
+        {...buildProps({
+          agentInfo: { agentWallet: wallet, llm: "groq", network: "stellar:testnet" } as any,
+        })}
+      />,
+    );
+
+    fireEvent.click(screen.getByRole("button", { name: /Copy/i }));
+
+    await waitFor(() => {
+      expect(screen.getByRole("status").textContent).toContain("Couldn't copy. Press Ctrl+C.");
+    });
+    expect((screen.getByLabelText(/Text that could not be copied/i) as HTMLInputElement).value)
+      .toBe(wallet);
+  });
+});