diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2fd1631..1c4041c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -34,3 +34,16 @@ jobs:
 
       - name: Run Unit Tests
         run: cargo test
+
+      - name: Install tarpaulin
+        run: cargo install cargo-tarpaulin
+
+      - name: Run Code Coverage
+        run: |
+          cargo tarpaulin --out Lcov --output-dir coverage
+          
+      - name: Upload Coverage report
+        uses: actions/upload-artifact@v3
+        with:
+          name: code-coverage-report
+          path: coverage/lcov.info
diff --git a/Cargo.lock b/Cargo.lock
index b88f6e5..a5c0689 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -23,6 +23,56 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "anstream"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43d5b281e737544384e969a5ccad3f1cdd24b48086a0fc1b2a5262a26b8f4f4a"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e7644824f0aa2c7b9384579234ef10eb7efb6a0deb83f9630a49594dd9c15c2"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
+dependencies = [
+ "anstyle",
+ "once_cell_polyfill",
+ "windows-sys",
+]
+
 [[package]]
 name = "arbitrary"
 version = "1.3.2"
@@ -257,6 +307,52 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "clap"
+version = "4.5.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2797f34da339ce31042b27d23607e051786132987f595b02ba4f6a6dffb7030a"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.5.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24a241312cea5059b13574bb9b3861cabf758b879c15190b37b6d6fd63ab6876"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.5.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a92793da1a46a5f2a02a6f4c46c6496b28c43638adea8306fcb0caa1634f24e5"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.115",
+]
+
+[[package]]
+name = "clap_lex"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
+
+[[package]]
+name = "colorchoice"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
+
 [[package]]
 name = "const-oid"
 version = "0.9.6"
@@ -311,6 +407,27 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "csv"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52cd9d68cf7efc6ddfaaee42e7288d3a99d613d4b50f76ce9827ae0c6e14f938"
+dependencies = [
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde_core",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "704a3c26996a80471189265814dbc2c257598b96b8a7feae2d31ace646bb9782"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ctor"
 version = "0.5.0"
@@ -484,6 +601,27 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "dirs-next"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
+dependencies = [
+ "cfg-if",
+ "dirs-sys-next",
+]
+
+[[package]]
+name = "dirs-sys-next"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
 [[package]]
 name = "downcast-rs"
 version = "1.2.1"
@@ -573,6 +711,12 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "encode_unicode"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34aa73646ffb006b8f5147f3dc182bd4bcb190227ce861fc4a4844bf8e3cb2c0"
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
@@ -700,6 +844,12 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "hermit-abi"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc0fef456e4baa96da950455cd02c081ca953b141298e41db3fc7e36b1da849c"
+
 [[package]]
 name = "hex"
 version = "0.4.3"
@@ -783,6 +933,23 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
+[[package]]
+name = "is-terminal"
+version = "0.4.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3640c1c38b8e4e43584d8df18be5fc6b0aa314ce6ebf51b53313d4306cca8e46"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "windows-sys",
+]
+
+[[package]]
+name = "is_terminal_polyfill"
+version = "1.70.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
+
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -829,6 +996,12 @@ dependencies = [
  "cpufeatures",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.181"
@@ -841,6 +1014,15 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6d2cec3eae94f9f509c767b45932f1ada8350c4bdb85af2fcab4a3c14807981"
 
+[[package]]
+name = "libredox"
+version = "0.1.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ddbf48fd451246b1f8c2610bd3b4ac0cc6e149d89832867093ab69a17194f08"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "log"
 version = "0.4.29"
@@ -915,6 +1097,12 @@ version = "1.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
 
+[[package]]
+name = "once_cell_polyfill"
+version = "1.70.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
+
 [[package]]
 name = "p256"
 version = "0.13.2"
@@ -968,6 +1156,20 @@ dependencies = [
  "syn 2.0.115",
 ]
 
+[[package]]
+name = "prettytable-rs"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eea25e07510aa6ab6547308ebe3c036016d162b8da920dbb079e3ba8acf3d95a"
+dependencies = [
+ "csv",
+ "encode_unicode",
+ "is-terminal",
+ "lazy_static",
+ "term",
+ "unicode-width",
+]
+
 [[package]]
 name = "primeorder"
 version = "0.13.6"
@@ -1025,6 +1227,17 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "redox_users"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba009ff324d1fc1b900bd1fdb31564febe58a8ccc8a6fdbb93b543d33b13ca43"
+dependencies = [
+ "getrandom",
+ "libredox",
+ "thiserror",
+]
+
 [[package]]
 name = "ref-cast"
 version = "1.0.25"
@@ -1070,6 +1283,12 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
+[[package]]
+name = "ryu"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f"
+
 [[package]]
 name = "schemars"
 version = "0.8.22"
@@ -1508,6 +1727,14 @@ version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
+[[package]]
+name = "substream-simulator"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "prettytable-rs",
+]
+
 [[package]]
 name = "substream_contracts"
 version = "0.0.0"
@@ -1543,6 +1770,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "term"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c59df8ac95d96ff9bede18eb7300b0fda5e5d8d90960e76f8e14ae765eedbf1f"
+dependencies = [
+ "dirs-next",
+ "rustversion",
+ "winapi",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.69"
@@ -1606,6 +1844,18 @@ version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "537dd038a89878be9b64dd4bd1b260315c1bb94f4d784956b81e27a088d9a09e"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
+
+[[package]]
+name = "utf8parse"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
+
 [[package]]
 name = "version_check"
 version = "0.9.5"
@@ -1711,6 +1961,28 @@ dependencies = [
  "indexmap-nostd",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-core"
 version = "0.62.2"
@@ -1770,6 +2042,15 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "zerocopy"
 version = "0.8.39"
diff --git a/Cargo.toml b/Cargo.toml
index ae69fd7..650c716 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,7 @@
 resolver = "2"
 members = [
   "contracts/*",
+  "simulator",
 ]
 
 [workspace.dependencies]
diff --git a/contracts/substream_contracts/src/lib.rs b/contracts/substream_contracts/src/lib.rs
index fe3cbbd..99ccfe6 100644
--- a/contracts/substream_contracts/src/lib.rs
+++ b/contracts/substream_contracts/src/lib.rs
@@ -50,6 +50,8 @@ pub enum DataKey {
     GiftsReceived(Address),
     CreatorSplit(Address),
     ContractAdmin,
+    ProtocolFeeBps,
+    Moderator(Address),
     VerifiedCreator(Address),
 }
 
@@ -130,13 +132,34 @@ impl SubStreamContract {
         env.storage().persistent().set(&DataKey::ContractAdmin, &admin);
     }
 
-    pub fn verify_creator(env: Env, admin: Address, creator: Address) {
+    pub fn verify_creator(env: Env, caller: Address, creator: Address) {
+        caller.require_auth();
+        let admin: Address = env.storage().persistent().get(&DataKey::ContractAdmin).expect("not initialized");
+        let is_mod = env.storage().persistent().get(&DataKey::Moderator(caller.clone())).unwrap_or(false);
+        
+        if caller != admin && !is_mod { 
+            panic!("unauthorized: admin or moderator required"); 
+        }
+
+        env.storage().persistent().set(&DataKey::VerifiedCreator(creator.clone()), &true);
+        CreatorVerified { creator, verified_by: caller }.publish(&env);
+    }
+
+    pub fn set_moderator(env: Env, admin: Address, moderator: Address, status: bool) {
         admin.require_auth();
         let stored_admin: Address = env.storage().persistent().get(&DataKey::ContractAdmin).expect("not initialized");
         if admin != stored_admin { panic!("admin only"); }
 
-        env.storage().persistent().set(&DataKey::VerifiedCreator(creator.clone()), &true);
-        CreatorVerified { creator, verified_by: admin }.publish(&env);
+        env.storage().persistent().set(&DataKey::Moderator(moderator), &status);
+    }
+
+    pub fn set_protocol_fee(env: Env, admin: Address, fee_bps: u32) {
+        admin.require_auth();
+        let stored_admin: Address = env.storage().persistent().get(&DataKey::ContractAdmin).expect("not initialized");
+        if admin != stored_admin { panic!("admin only"); }
+        if fee_bps > 10000 { panic!("invalid fee bps"); }
+
+        env.storage().persistent().set(&DataKey::ProtocolFeeBps, &fee_bps);
     }
 
     pub fn is_creator_verified(env: Env, creator: Address) -> bool {
diff --git a/scripts/generate_bindings.ps1 b/scripts/generate_bindings.ps1
new file mode 100644
index 0000000..e39f13f
--- /dev/null
+++ b/scripts/generate_bindings.ps1
@@ -0,0 +1,26 @@
+# Generate TypeScript bindings for the SubStream Soroban contract (PowerShell)
+
+$CONTRACT_WASM = "./target/wasm32-unknown-unknown/release/substream_contracts.wasm"
+$OUTPUT_DIR = "./bindings/substream"
+
+# 1. Build contract if wasm doesn't exist
+if (-not (Test-Path $CONTRACT_WASM)) {
+    Write-Host "WASM not found. Building contract..." -ForegroundColor Yellow
+    cargo build --target wasm32-unknown-unknown --release
+}
+
+# 2. Check for stellar-cli
+if (-not (Get-Command "stellar" -ErrorAction SilentlyContinue)) {
+    Write-Host "stellar-cli could not be found. Please install it with 'cargo install --locked stellar-cli'" -ForegroundColor Red
+    exit
+}
+
+# 3. Generate bindings
+Write-Host "Generating TypeScript bindings for $CONTRACT_WASM..." -ForegroundColor Cyan
+if (-not (Test-Path $OUTPUT_DIR)) {
+    New-Item -ItemType Directory -Path $OUTPUT_DIR -Force | Out-Null
+}
+
+stellar contract bindings typescript --wasm $CONTRACT_WASM --output-dir $OUTPUT_DIR --overwrite
+
+Write-Host "Bindings generated in $OUTPUT_DIR" -ForegroundColor Green
diff --git a/scripts/generate_bindings.sh b/scripts/generate_bindings.sh
new file mode 100644
index 0000000..0fc2179
--- /dev/null
+++ b/scripts/generate_bindings.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+# Generate TypeScript bindings for the SubStream Soroban contract
+
+CONTRACT_WASM="./target/wasm32-unknown-unknown/release/substream_contracts.wasm"
+OUTPUT_DIR="./bindings/substream"
+
+# 1. Build contract if wasm doesn't exist
+if [ ! -f "$CONTRACT_WASM" ]; then
+    echo "WASM not found. Building contract..."
+    cargo build --target wasm32-unknown-unknown --release
+fi
+
+# 2. Check for stellar-cli
+if ! command -v stellar &> /dev/null
+then
+    echo "stellar-cli could not be found. Please install it with 'cargo install --locked stellar-cli'"
+    exit 1
+fi
+
+# 3. Generate bindings
+echo "Generating TypeScript bindings for $CONTRACT_WASM..."
+mkdir -p $OUTPUT_DIR
+stellar contract bindings typescript --wasm $CONTRACT_WASM --output-dir $OUTPUT_DIR --overwrite
+
+echo "Bindings generated in $OUTPUT_DIR"
diff --git a/simulator/Cargo.toml b/simulator/Cargo.toml
new file mode 100644
index 0000000..5d08a6d
--- /dev/null
+++ b/simulator/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "substream-simulator"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.0", features = ["derive"] }
+prettytable-rs = "0.10"
diff --git a/simulator/src/main.rs b/simulator/src/main.rs
new file mode 100644
index 0000000..1c6068b
--- /dev/null
+++ b/simulator/src/main.rs
@@ -0,0 +1,63 @@
+use clap::Parser;
+use prettytable::{Table, row};
+
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+struct Args {
+    /// Initial number of subscribers
+    #[arg(short, long, default_value_t = 100)]
+    subscribers: u32,
+
+    /// Monthly growth rate in percentage (e.g., 10 for 10%)
+    #[arg(short, long, default_value_t = 15.0)]
+    growth: f64,
+
+    /// Monthly churn rate in percentage (e.g., 5 for 5%)
+    #[arg(short, long, default_value_t = 5.0)]
+    churn: f64,
+
+    /// Monthly subscription fee in dollars
+    #[arg(short, long, default_value_t = 10.0)]
+    fee: f64,
+
+    /// Number of months to simulate
+    #[arg(short, long, default_value_t = 12)]
+    months: u32,
+}
+
+fn main() {
+    let args = Args::parse();
+    
+    let mut current_subs = args.subscribers as f64;
+    let growth_rate = args.growth / 100.0;
+    let churn_rate = args.churn / 100.0;
+    
+    let mut table = Table::new();
+    table.add_row(row!["Month", "New Subs", "Lost Subs", "Net Subs", "Revenue ($)"]);
+
+    for month in 1..=args.months {
+        let newcomers = current_subs * growth_rate;
+        let churners = current_subs * churn_rate;
+        let net_growth = newcomers - churners;
+        current_subs += net_growth;
+        
+        let monthly_revenue = current_subs * args.fee;
+        
+        table.add_row(row![
+            month,
+            format!("{:.1}", newcomers),
+            format!("{:.1}", churners),
+            format!("{:.0}", current_subs.max(0.0)),
+            format!("{:.2}", monthly_revenue.max(0.0))
+        ]);
+    }
+    
+    println!("\nSubStream Creator Revenue Simulator");
+    println!("----------------------------------");
+    println!("Initial Subs: {}", args.subscribers);
+    println!("Monthly Growth: {}%", args.growth);
+    println!("Monthly Churn: {}%", args.churn);
+    println!("Subscription Fee: ${}", args.fee);
+    println!("\nProjection:");
+    table.printstd();
+}