diff --git a/.env.example b/.env.example
index 5ba6444..4588451 100644
--- a/.env.example
+++ b/.env.example
@@ -1,4 +1,6 @@
 NEXT_PUBLIC_NETWORK=testnet
+NEXT_PUBLIC_SOROBAN_RPC_URL=
 NEXT_PUBLIC_STREAM_CONTRACT_ID=
 NEXT_PUBLIC_VESTING_CONTRACT_ID=
+NEXT_PUBLIC_DISTRIBUTOR_CONTRACT_ID=
 NEXT_PUBLIC_API_URL=http://localhost:3001
diff --git a/.gitignore b/.gitignore
index f3d4950..9d8e788 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ out/
 .env
 .env.local
 .DS_Store
+tsconfig.tsbuildinfo
diff --git a/package-lock.json b/package-lock.json
index 586479e..e62d588 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "name": "soroprotocol-app",
       "version": "0.1.0",
       "dependencies": {
+        "@stellar/stellar-sdk": "^16.2.0",
         "next": "14.2.0",
         "react": "^18.3.0",
         "react-dom": "^18.3.0"
@@ -18,7 +19,8 @@
         "@types/react-dom": "^18",
         "eslint": "^8",
         "eslint-config-next": "14.2.0",
-        "typescript": "^5"
+        "typescript": "^5",
+        "vitest": "^2.1.0"
       }
     },
     "node_modules/@emnapi/core": {
@@ -55,228 +57,969 @@
         "tslib": "^2.4.0"
       }
     },
-    "node_modules/@eslint-community/eslint-utils": {
-      "version": "4.9.1",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
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+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
+      "integrity": "sha512-1SDgH6ZSPTlggy1yI6+Dbkiz8xzpHJEVAlF/AM1tHPLsf5STom9rwtjE4hKAF20FfXXNTFqEYXyJNWh1GiZedQ==",
+      "cpu": [
+        "ppc64"
+      ],
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "eslint-visitor-keys": "^3.4.3"
-      },
+      "optional": true,
+      "os": [
+        "aix"
+      ],
       "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
-      },
-      "funding": {
-        "url": "https://opencollective.com/eslint"
-      },
-      "peerDependencies": {
-        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+        "node": ">=12"
       }
     },
-    "node_modules/@eslint-community/regexpp": {
-      "version": "4.12.2",
-      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
-      "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.21.5.tgz",
+      "integrity": "sha512-vCPvzSjpPHEi1siZdlvAlsPxXl7WbOVUBBAowWug4rJHb68Ox8KualB+1ocNvT5fjv6wpkX6o/iEpbDrf68zcg==",
+      "cpu": [
+        "arm"
+      ],
       "dev": true,
       "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
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-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-2.1.4.tgz",
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+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.21.5.tgz",
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+      "cpu": [
+        "arm64"
+      ],
       "dev": true,
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-      "dependencies": {
-        "ajv": "^6.12.4",
-        "debug": "^4.3.2",
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-        "js-yaml": "^4.1.0",
-        "minimatch": "^3.1.2",
-        "strip-json-comments": "^3.1.1"
-      },
+      "optional": true,
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-      "funding": {
-        "url": "https://opencollective.com/eslint"
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-    "node_modules/@eslint/js": {
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-      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-8.57.1.tgz",
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+      ],
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+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.21.5.tgz",
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+        "x64"
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+      "license": "MIT",
+      "optional": true,
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-      },
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-        "type": "github",
-        "url": "https://github.com/sponsors/nzakas"
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@@ -4346,6 +5748,52 @@
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@@ -4618,6 +6073,18 @@
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@@ -4634,6 +6101,20 @@
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@@ -4946,6 +6427,20 @@
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@@ -4994,6 +6489,36 @@
         "url": "https://github.com/sponsors/jonschlinkert"
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+      "license": "MIT",
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+      "dev": true,
+      "license": "MIT",
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@@ -5157,6 +6682,18 @@
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+      "license": "MIT",
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@@ -5231,6 +6768,184 @@
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+        "postcss": "^8.4.43",
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+      "license": "MIT",
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+        "debug": "^4.3.7",
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+          "url": "https://opencollective.com/postcss/"
+        },
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+          "url": "https://tidelift.com/funding/github/npm/postcss"
+        },
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+      "dev": true,
+      "license": "MIT",
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+        "@vitest/mocker": "2.1.9",
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+        "debug": "^4.3.7",
+        "expect-type": "^1.1.0",
+        "magic-string": "^0.30.12",
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+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.1",
+        "tinypool": "^1.0.1",
+        "tinyrainbow": "^1.2.0",
+        "vite": "^5.0.0",
+        "vite-node": "2.1.9",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
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+      },
+      "engines": {
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+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
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+        "@types/node": "^18.0.0 || >=20.0.0",
+        "@vitest/browser": "2.1.9",
+        "@vitest/ui": "2.1.9",
+        "happy-dom": "*",
+        "jsdom": "*"
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@@ -5336,6 +7051,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
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+      "license": "MIT",
+      "dependencies": {
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+        "stackback": "0.0.2"
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diff --git a/package.json b/package.json
index 4d3c717..5ad84bd 100644
--- a/package.json
+++ b/package.json
@@ -3,22 +3,26 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "dev":   "next dev",
+    "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint":  "next lint"
+    "lint": "next lint",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
-    "next":     "14.2.0",
-    "react":    "^18.3.0",
-    "react-dom":"^18.3.0"
+    "@stellar/stellar-sdk": "^16.2.0",
+    "next": "14.2.0",
+    "react": "^18.3.0",
+    "react-dom": "^18.3.0"
   },
   "devDependencies": {
-    "@types/node":       "^20",
-    "@types/react":      "^18",
-    "@types/react-dom":  "^18",
-    "typescript":        "^5",
-    "eslint":            "^8",
-    "eslint-config-next":"14.2.0"
+    "@types/node": "^20",
+    "@types/react": "^18",
+    "@types/react-dom": "^18",
+    "eslint": "^8",
+    "eslint-config-next": "14.2.0",
+    "typescript": "^5",
+    "vitest": "^2.1.0"
   }
 }
diff --git a/src/app/create/page.tsx b/src/app/create/page.tsx
index 0b834f7..1854e90 100644
--- a/src/app/create/page.tsx
+++ b/src/app/create/page.tsx
@@ -2,6 +2,8 @@
 import Link from 'next/link';
 import { useState, FormEvent } from 'react';
 import { useWallet } from '@/context/WalletContext';
+import { useContract } from '@/hooks/useContract';
+import { streams } from '@/lib/contracts';
 import styles from './create.module.css';
 
 interface FormState {
@@ -19,6 +21,7 @@ const INITIAL: FormState = {
 
 export default function CreateStream() {
   const { address } = useWallet();
+  const { execute, loading, error: contractError } = useContract();
   const [form,   setForm]   = useState<FormState>(INITIAL);
   const [errors, setErrors] = useState<Partial<FormState>>({});
   const [status, setStatus] = useState<'idle' | 'submitting' | 'done'>('idle');
@@ -37,11 +40,33 @@ export default function CreateStream() {
 
   async function handleSubmit(e: FormEvent) {
     e.preventDefault();
-    if (!validate()) return;
+    if (!validate() || !address) return;
     setStatus('submitting');
-    // Contract call via SDK would go here
-    await new Promise(r => setTimeout(r, 1200));
-    setStatus('done');
+
+    // Convert rate from XLM/day to stroops/second
+    const ratePerDay = parseFloat(form.ratePerDay);
+    const stroopsPerDay = Math.round(ratePerDay * 1e7);
+    const ratePerSecond = Math.round(stroopsPerDay / 86400);
+
+    const result = await execute(() =>
+      streams.createStream(
+        {
+          sender:        address,
+          recipient:     form.recipient,
+          token:         form.token,
+          ratePerSecond: ratePerSecond.toString(),
+          startTime:     Math.floor(new Date(form.startDate).getTime() / 1000),
+          stopTime:      Math.floor(new Date(form.stopDate).getTime() / 1000),
+        },
+        address,
+      )
+    );
+
+    if (result) {
+      setStatus('done');
+    } else {
+      setStatus('idle');
+    }
   }
 
   if (!address) {
@@ -129,12 +154,16 @@ export default function CreateStream() {
           </label>
         </div>
 
+        {contractError && (
+          <p className={styles.error} role="alert">{contractError}</p>
+        )}
+
         <button
           className={styles.submit}
           type="submit"
-          disabled={status === 'submitting'}
+          disabled={status === 'submitting' || loading}
         >
-          {status === 'submitting' ? 'Creating stream…' : 'Create Stream'}
+          {status === 'submitting' || loading ? 'Creating stream…' : 'Create Stream'}
         </button>
       </form>
     </div>
diff --git a/src/app/streams/[id]/page.tsx b/src/app/streams/[id]/page.tsx
index 7c79095..cb6ea19 100644
--- a/src/app/streams/[id]/page.tsx
+++ b/src/app/streams/[id]/page.tsx
@@ -4,6 +4,8 @@ import { useStream }          from '@/hooks/useStreams';
 import { useWallet }          from '@/context/WalletContext';
 import { useStreamBalance }   from '@/hooks/useStreamBalance';
 import { useToast }           from '@/context/ToastContext';
+import { useContract }        from '@/hooks/useContract';
+import { streams }            from '@/lib/contracts';
 import styles                 from './stream.module.css';
 
 function fmt(stroops: bigint): string {
@@ -15,6 +17,7 @@ export default function StreamDetail() {
   const router                     = useRouter();
   const { address }                = useWallet();
   const toast                      = useToast();
+  const { execute, loading: txLoading, error: txError } = useContract();
   const { stream, loading, error } = useStream(id);
 
   const balance = useStreamBalance(
@@ -67,22 +70,37 @@ export default function StreamDetail() {
 
       {isActive && (
         <div className={styles.actions}>
+          {txError && <p className={styles.error} role="alert">{txError}</p>}
           {isRecipient && (
             <button
               className={styles.btnWithdraw}
-              disabled={balance === 0n}
+              disabled={balance === 0n || txLoading}
               title={balance === 0n ? 'Nothing to withdraw yet' : undefined}
-              onClick={() => toast.info('Withdraw submitted — confirm in Freighter')}
+              onClick={async () => {
+                if (!address) return;
+                toast.info('Confirm withdrawal in Freighter…');
+                const result = await execute(() => streams.withdrawStream(stream.contractStreamId, address));
+                if (result) toast.success(`Withdrawal confirmed! Tx: ${result.hash.slice(0, 12)}…`);
+              }}
             >
-              Withdraw {fmt(balance)} XLM
+              {txLoading ? 'Withdrawing…' : `Withdraw ${fmt(balance)} XLM`}
             </button>
           )}
           {isSender && (
             <button
               className={styles.btnCancel}
-              onClick={() => toast.info('Cancel request submitted — confirm in Freighter')}
+              disabled={txLoading}
+              onClick={async () => {
+                if (!address) return;
+                toast.info('Confirm cancellation in Freighter…');
+                const result = await execute(() => streams.cancelStream(stream.contractStreamId, address));
+                if (result) {
+                  toast.success(`Stream cancelled! Tx: ${result.hash.slice(0, 12)}…`);
+                  router.refresh();
+                }
+              }}
             >
-              Cancel Stream
+              {txLoading ? 'Cancelling…' : 'Cancel Stream'}
             </button>
           )}
           {!isSender && !isRecipient && (
diff --git a/src/app/vesting/page.tsx b/src/app/vesting/page.tsx
index 44489e5..9d01064 100644
--- a/src/app/vesting/page.tsx
+++ b/src/app/vesting/page.tsx
@@ -3,6 +3,8 @@ import Link from 'next/link';
 import { useEffect, useState } from 'react';
 import { useWallet }   from '@/context/WalletContext';
 import { useToast }    from '@/context/ToastContext';
+import { useContract } from '@/hooks/useContract';
+import { vesting as vestingContract } from '@/lib/contracts';
 import { vestingApi, type ApiVestingSchedule } from '@/services/api';
 import { fmtStroops, vestPct } from '@/lib/vesting';
 import styles from './vesting.module.css';
@@ -10,6 +12,7 @@ import styles from './vesting.module.css';
 export default function Vesting() {
   const { address }   = useWallet();
   const toast         = useToast();
+  const { execute, loading: txLoading, error: txError } = useContract();
   const [schedules, setSchedules] = useState<ApiVestingSchedule[]>([]);
   const [loading,   setLoading]   = useState(false);
   const [error,     setError]     = useState<string | null>(null);
@@ -78,12 +81,25 @@ export default function Vesting() {
                 <p className={styles.pctLabel}>{pct}% vested</p>
 
                 {!s.revoked && (
-                  <button
-                    className={styles.claimBtn}
-                    onClick={() => toast.info('On-chain claim coming in the next release')}
-                  >
-                    Claim Vested Tokens
-                  </button>
+                  <>
+                    {txError && <p className={styles.error} role="alert">{txError}</p>}
+                    <button
+                      className={styles.claimBtn}
+                      disabled={txLoading}
+                      onClick={async () => {
+                        if (!address) return;
+                        toast.info('Confirm claim in Freighter…');
+                        const result = await execute(() => vestingContract.claimVesting(s.id, address));
+                        if (result) {
+                          toast.success(`Claim confirmed! Tx: ${result.hash.slice(0, 12)}…`);
+                          // Refresh the list
+                          vestingApi.list(address).then(setSchedules).catch(() => {});
+                        }
+                      }}
+                    >
+                      {txLoading ? 'Claiming…' : 'Claim Vested Tokens'}
+                    </button>
+                  </>
                 )}
               </div>
             );
diff --git a/src/hooks/useContract.ts b/src/hooks/useContract.ts
new file mode 100644
index 0000000..acef0af
--- /dev/null
+++ b/src/hooks/useContract.ts
@@ -0,0 +1,55 @@
+'use client';
+/**
+ * React hook for executing contract transactions with loading/error states.
+ *
+ * Wraps the contract methods to provide a clean React interface:
+ *   const { execute, loading, error } = useContract();
+ *   await execute(() => streams.createStream(args, address));
+ */
+
+import { useState, useCallback } from 'react';
+import { ContractError, parseContractError } from '@/lib/contracts';
+
+interface UseContractReturn {
+  /** Execute a contract call. Returns the result on success, throws on error. */
+  execute: <T>(fn: () => Promise<T>) => Promise<T | null>;
+  /** True while a contract call is in flight */
+  loading: boolean;
+  /** Error message from the last failed call (cleared on next execute) */
+  error: string | null;
+  /** The typed error code from the last failed call, if it's a ContractError */
+  errorCode: ContractError['code'] | null;
+  /** Clear the current error state */
+  clearError: () => void;
+}
+
+export function useContract(): UseContractReturn {
+  const [loading, setLoading] = useState(false);
+  const [error, setError]     = useState<string | null>(null);
+  const [errorCode, setErrorCode] = useState<ContractError['code'] | null>(null);
+
+  const clearError = useCallback(() => {
+    setError(null);
+    setErrorCode(null);
+  }, []);
+
+  const execute = useCallback(async <T,>(fn: () => Promise<T>): Promise<T | null> => {
+    setLoading(true);
+    setError(null);
+    setErrorCode(null);
+
+    try {
+      const result = await fn();
+      return result;
+    } catch (err) {
+      const parsed = parseContractError(err);
+      setError(parsed.message);
+      setErrorCode(parsed.code);
+      return null;
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  return { execute, loading, error, errorCode, clearError };
+}
diff --git a/src/lib/contracts/client.ts b/src/lib/contracts/client.ts
new file mode 100644
index 0000000..0e3dfed
--- /dev/null
+++ b/src/lib/contracts/client.ts
@@ -0,0 +1,241 @@
+/**
+ * Core Soroban contract client.
+ *
+ * Handles the full lifecycle: build XDR → simulate → sign (Freighter) →
+ * submit → poll for confirmation. All contract method wrappers call
+ * into this client.
+ */
+
+import * as StellarSdk from '@stellar/stellar-sdk';
+import { getNetwork, type NetworkConfig } from './network';
+import { ContractError, ContractErrorCode, parseContractError } from './errors';
+import { BASE_FEE, TX_CONFIRM_TIMEOUT_MS, TX_POLL_INTERVAL_MS } from './constants';
+import type { TxResult, SimulationResult } from './types';
+
+/** Freighter browser extension API (loaded at runtime via window.freighter) */
+interface FreighterApi {
+  getAddress():      Promise<{ address: string }>;
+  getNetwork():      Promise<{ network: string }>;
+  signTransaction(xdr: string, opts?: { network?: string }): Promise<{ signedTxXdr: string }>;
+}
+
+function getFreighter(): FreighterApi {
+  const freighter = (window as any).freighter as FreighterApi | undefined;
+  if (!freighter) throw new ContractError(ContractErrorCode.NetworkError, 'Freighter extension not installed');
+  return freighter;
+}
+
+/** Lazy-initialised Soroban RPC client */
+let rpcClient: StellarSdk.rpc.Server | null = null;
+
+export function getRpcClient(): StellarSdk.rpc.Server {
+  if (!rpcClient) {
+    const config = getNetwork();
+    rpcClient = new StellarSdk.rpc.Server(config.sorobanRpc);
+  }
+  return rpcClient;
+}
+
+/**
+ * Reset the cached RPC client. Useful when the user switches networks
+ * in Freighter and the stale client points at the wrong RPC.
+ */
+export function resetRpcClient(): void {
+  rpcClient = null;
+}
+
+/**
+ * Get the current network config. Re-reads env vars each call so a
+ * network switch in Freighter is picked up without a page reload.
+ */
+export function getNetworkConfig(): NetworkConfig {
+  return getNetwork();
+}
+
+// ── XDR Helpers ─────────────────────────────────────────────────────────────
+
+/**
+ * Build a Soroban contract invocation transaction (unsigned).
+ *
+ * @param contractId  - Soroban contract address
+ * @param method      - Contract method name
+ * @param args        - Method arguments (will be scValEncoded)
+ * @param source      - Sender's Stellar public key (account to sign)
+ * @returns Unsigned transaction XDR (base64)
+ */
+export async function buildContractTx(
+  contractId: string,
+  method: string,
+  args: StellarSdk.xdr.ScVal[],
+  source: string,
+): Promise<string> {
+  const config = getNetwork();
+  const rpc = getRpcClient();
+
+  const account = await rpc.getAccount(source);
+
+  const contract = new StellarSdk.Contract(contractId);
+  const invocation = contract.call(method, ...args);
+
+  const tx = new StellarSdk.TransactionBuilder(account, {
+    fee: BASE_FEE,
+    networkPassphrase: config.passphrase,
+  })
+    .addOperation(invocation)
+    .setTimeout(StellarSdk.TimeoutInfinite)
+    .build();
+
+  return tx.toXDR();
+}
+
+/**
+ * Simulate a transaction and assemble it with Soroban auth/footprint data.
+ * This is required before signing — Soroban transactions need the
+ * simulation result attached (authorization entries, resource footprints).
+ *
+ * @param unsignedXdr - Base64 XDR of the unsigned transaction
+ * @returns Assembled transaction XDR ready for signing
+ */
+export async function simulateTx(unsignedXdr: string): Promise<SimulationResult> {
+  const rpc = getRpcClient();
+  const passphrase = getNetwork().passphrase;
+  const tx = new StellarSdk.Transaction(unsignedXdr, passphrase);
+
+  const response = await rpc.simulateTransaction(tx);
+
+  if (StellarSdk.rpc.Api.isSimulationError(response)) {
+    throw parseContractError(response.error);
+  }
+
+  // Assemble the transaction with Soroban auth entries and footprint
+  // assembleTransaction returns a TransactionBuilder — build() gives us the Transaction
+  const assembled = StellarSdk.rpc.assembleTransaction(tx, response);
+  const assembledTx = assembled.build();
+
+  return {
+    assembledXdr: assembledTx.toXDR(),
+    result:       response.result?.retval ?? null,
+    auth:         (response.result?.auth ?? []).length > 0,
+    cost:         {
+      cpuInsns: '0',
+      memBytes: '0',
+    },
+  };
+}
+
+/**
+ * Sign a transaction using Freighter.
+ * Freighter pops up a confirmation dialog — the user can approve or reject.
+ */
+export async function signWithFreighter(unsignedXdr: string): Promise<string> {
+  try {
+    const freighter = getFreighter();
+    const config = getNetwork();
+    const { signedTxXdr } = await freighter.signTransaction(unsignedXdr, {
+      network: config.passphrase,
+    });
+    return signedTxXdr;
+  } catch (err) {
+    throw parseContractError(err);
+  }
+}
+
+/**
+ * Submit a signed transaction to the Soroban network.
+ *
+ * @param signedXdr - Base64 XDR of the signed transaction
+ * @returns TxResult with hash and ledger
+ */
+export async function submitTx(signedXdr: string): Promise<TxResult> {
+  const rpc = getRpcClient();
+  const tx = new StellarSdk.Transaction(signedXdr, getNetwork().passphrase);
+
+  try {
+    const response = await rpc.sendTransaction(tx);
+
+    if (response.status === 'ERROR') {
+      const errStr = response.errorResult
+        ? response.errorResult.toString()
+        : 'Transaction submission failed';
+      throw new ContractError(ContractErrorCode.SubmitFailed, errStr);
+    }
+
+    // Poll for confirmation
+    return await pollForConfirmation(response.hash);
+  } catch (err) {
+    if (err instanceof ContractError) throw err;
+    throw parseContractError(err);
+  }
+}
+
+/**
+ * Poll Soroban RPC until a transaction is confirmed or times out.
+ */
+async function pollForConfirmation(hash: string): Promise<TxResult> {
+  const rpc = getRpcClient();
+  const deadline = Date.now() + TX_CONFIRM_TIMEOUT_MS;
+
+  while (Date.now() < deadline) {
+    const response = await rpc.getTransaction(hash);
+
+    if (response.status === StellarSdk.rpc.Api.GetTransactionStatus.SUCCESS) {
+      return {
+        hash:    response.txHash,
+        ledger:  response.ledger,
+        result:  response.resultXdr.toString(),
+      };
+    }
+
+    if (response.status === StellarSdk.rpc.Api.GetTransactionStatus.FAILED) {
+      throw new ContractError(ContractErrorCode.SubmitFailed, `Tx ${hash} failed on-chain`);
+    }
+
+    // NOT_FOUND or still pending — wait and retry
+    await new Promise(r => setTimeout(r, TX_POLL_INTERVAL_MS));
+  }
+
+  throw new ContractError(ContractErrorCode.NetworkError, `Tx ${hash} timed out waiting for confirmation`);
+}
+
+// ── Simulation result extraction ────────────────────────────────────────────
+
+/**
+ * Extract the native return value from a simulation response.
+ * Used by read-only contract calls (balance_of, get_stream, etc.).
+ *
+ * The parsed simulation response has `result.retval` which is the
+ * direct ScVal return value — no need to parse TransactionResult XDR.
+ */
+export function extractSimulationResult(
+  response: StellarSdk.rpc.Api.SimulateTransactionResponse,
+): StellarSdk.xdr.ScVal | undefined {
+  if (!StellarSdk.rpc.Api.isSimulationSuccess(response)) return undefined;
+  return response.result?.retval;
+}
+
+// ── High-level helper ───────────────────────────────────────────────────────
+
+/**
+ * Build → simulate → sign → submit a contract transaction in one call.
+ * This is the main entry point used by contract method wrappers.
+ *
+ * @returns TxResult on success
+ */
+export async function executeContractTx(
+  contractId: string,
+  method: string,
+  args: StellarSdk.xdr.ScVal[],
+  source: string,
+): Promise<TxResult> {
+  // 1. Build unsigned XDR
+  const unsignedXdr = await buildContractTx(contractId, method, args, source);
+
+  // 2. Simulate and assemble — attaches Soroban auth/footprint data
+  const simulation = await simulateTx(unsignedXdr);
+
+  // 3. Sign the assembled tx via Freighter (user sees confirmation dialog)
+  const signedXdr = await signWithFreighter(simulation.assembledXdr);
+
+  // 4. Submit and wait for confirmation
+  return await submitTx(signedXdr);
+}
diff --git a/src/lib/contracts/constants.ts b/src/lib/contracts/constants.ts
new file mode 100644
index 0000000..41214a7
--- /dev/null
+++ b/src/lib/contracts/constants.ts
@@ -0,0 +1,28 @@
+/**
+ * Contract addresses and shared constants.
+ *
+ * All contract IDs come from env vars (set in .env.local per network).
+ * These are public on-chain addresses — safe to expose in the browser bundle.
+ */
+
+export const STREAM_CONTRACT_ID =
+  process.env.NEXT_PUBLIC_STREAM_CONTRACT_ID ?? '';
+
+export const VESTING_CONTRACT_ID =
+  process.env.NEXT_PUBLIC_VESTING_CONTRACT_ID ?? '';
+
+export const DISTRIBUTOR_CONTRACT_ID =
+  process.env.NEXT_PUBLIC_DISTRIBUTOR_CONTRACT_ID ?? '';
+
+/** USDC on Stellar testnet — Circle's official issuer */
+export const USDC_TESTNET_ISSUER =
+  'GA5ZSEJYB37JDD5G4LYXOKMWSUVC5HBH724QZDU5DHVJ76SCZGR5SOY3';
+
+/** Maximum time to wait for transaction confirmation (ms) */
+export const TX_CONFIRM_TIMEOUT_MS = 30_000;
+
+/** Polling interval for transaction confirmation (ms) */
+export const TX_POLL_INTERVAL_MS = 2_000;
+
+/** Base fee for Soroban transactions (in stroops) */
+export const BASE_FEE = '100000';
diff --git a/src/lib/contracts/contracts.test.ts b/src/lib/contracts/contracts.test.ts
new file mode 100644
index 0000000..fb71de1
--- /dev/null
+++ b/src/lib/contracts/contracts.test.ts
@@ -0,0 +1,123 @@
+import { describe, it, expect } from 'vitest';
+import { ContractError, ContractErrorCode, parseContractError } from './errors';
+import { getNetwork } from './network';
+import {
+  STREAM_CONTRACT_ID,
+  VESTING_CONTRACT_ID,
+  DISTRIBUTOR_CONTRACT_ID,
+  BASE_FEE,
+  TX_CONFIRM_TIMEOUT_MS,
+  TX_POLL_INTERVAL_MS,
+} from './constants';
+
+// ── ContractError ───────────────────────────────────────────────────────────
+
+describe('ContractError', () => {
+  it('creates an error with the correct code and message', () => {
+    const err = new ContractError(ContractErrorCode.NotFound);
+    expect(err.code).toBe(ContractErrorCode.NotFound);
+    expect(err.message).toBe('Stream not found on-chain');
+    expect(err.name).toBe('ContractError');
+    expect(err instanceof Error).toBe(true);
+  });
+
+  it('appends detail to the base message', () => {
+    const err = new ContractError(ContractErrorCode.Unauthorized, 'wallet 0xABC');
+    expect(err.message).toBe('You are not authorized for this action: wallet 0xABC');
+  });
+});
+
+// ── parseContractError ──────────────────────────────────────────────────────
+
+describe('parseContractError', () => {
+  it('returns the same ContractError if already typed', () => {
+    const original = new ContractError(ContractErrorCode.AlreadyCancelled);
+    const parsed = parseContractError(original);
+    expect(parsed).toBe(original);
+  });
+
+  it('parses user rejection errors', () => {
+    const parsed = parseContractError(new Error('User denied the transaction'));
+    expect(parsed.code).toBe(ContractErrorCode.UserRejected);
+  });
+
+  it('parses Freighter denial', () => {
+    const parsed = parseContractError(new Error('UserDeclined'));
+    expect(parsed.code).toBe(ContractErrorCode.UserRejected);
+  });
+
+  it('parses simulation errors', () => {
+    const parsed = parseContractError(new Error('SimulateTxFailed: something went wrong'));
+    expect(parsed.code).toBe(ContractErrorCode.SimulationFailed);
+  });
+
+  it('extracts contract error code from simulation message', () => {
+    const parsed = parseContractError(new Error('SimulateTxFailed: contract_error(3) occurred'));
+    expect(parsed.code).toBe(ContractErrorCode.AlreadyCancelled);
+  });
+
+  it('parses network errors', () => {
+    const parsed = parseContractError(new Error('fetch failed ECONNREFUSED'));
+    expect(parsed.code).toBe(ContractErrorCode.NetworkError);
+  });
+
+  it('parses submission errors', () => {
+    const parsed = parseContractError(new Error('submit TxFailed'));
+    expect(parsed.code).toBe(ContractErrorCode.SubmitFailed);
+  });
+
+  it('falls back to SimulationFailed for unknown errors', () => {
+    const parsed = parseContractError(new Error('something weird happened'));
+    expect(parsed.code).toBe(ContractErrorCode.SimulationFailed);
+    expect(parsed.message).toContain('something weird happened');
+  });
+
+  it('handles non-Error values', () => {
+    const parsed = parseContractError('raw string error');
+    expect(parsed.code).toBe(ContractErrorCode.SimulationFailed);
+    expect(parsed.message).toContain('raw string error');
+  });
+});
+
+// ── Network config ──────────────────────────────────────────────────────────
+
+describe('getNetwork', () => {
+  it('returns a valid network config object', () => {
+    const config = getNetwork();
+    expect(config).toHaveProperty('name');
+    expect(config).toHaveProperty('sorobanRpc');
+    expect(config).toHaveProperty('passphrase');
+    expect(['testnet', 'mainnet']).toContain(config.name);
+  });
+
+  it('has a non-empty RPC URL', () => {
+    const config = getNetwork();
+    expect(config.sorobanRpc).toBeTruthy();
+    expect(config.sorobanRpc.startsWith('http')).toBe(true);
+  });
+
+  it('has a non-empty passphrase', () => {
+    const config = getNetwork();
+    expect(config.passphrase.length).toBeGreaterThan(10);
+  });
+});
+
+// ── Constants ───────────────────────────────────────────────────────────────
+
+describe('contract constants', () => {
+  it('BASE_FEE is a valid stroops amount', () => {
+    expect(Number(BASE_FEE)).toBeGreaterThan(0);
+  });
+
+  it('TX_CONFIRM_TIMEOUT_MS is at least 10 seconds', () => {
+    expect(TX_CONFIRM_TIMEOUT_MS).toBeGreaterThanOrEqual(10_000);
+  });
+
+  it('TX_POLL_INTERVAL_MS is at least 500ms', () => {
+    expect(TX_POLL_INTERVAL_MS).toBeGreaterThanOrEqual(500);
+  });
+
+  it('TX_POLL_INTERVAL_MS is less than TX_CONFIRM_TIMEOUT_MS', () => {
+    expect(TX_POLL_INTERVAL_MS).toBeLessThan(TX_CONFIRM_TIMEOUT_MS);
+  });
+});
diff --git a/src/lib/contracts/distributor.ts b/src/lib/contracts/distributor.ts
new file mode 100644
index 0000000..deedce4
--- /dev/null
+++ b/src/lib/contracts/distributor.ts
@@ -0,0 +1,82 @@
+/**
+ * Distributor contract method wrappers.
+ *
+ * The distributor contract handles batch token distribution — send the
+ * same amount to multiple recipients, or different amounts per recipient.
+ */
+
+import * as StellarSdk from '@stellar/stellar-sdk';
+import { executeContractTx } from './client';
+import { DISTRIBUTOR_CONTRACT_ID } from './constants';
+import { ContractError, ContractErrorCode } from './errors';
+import type { DistributeArgs, DistributeCustomArgs, TxResult } from './types';
+
+function requireContract(): string {
+  if (!DISTRIBUTOR_CONTRACT_ID) {
+    throw new ContractError(ContractErrorCode.NotFound, 'DISTRIBUTOR_CONTRACT_ID not set in env');
+  }
+  return DISTRIBUTOR_CONTRACT_ID;
+}
+
+function toScValBytes32(hex: string): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(hex, { type: 'bytes' });
+}
+
+function toScValI128(value: string | bigint): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(value, { type: 'i128' });
+}
+
+function toScValAddress(address: string): StellarSdk.xdr.ScVal {
+  return StellarSdk.Address.fromString(address).toScVal();
+}
+
+/**
+ * Distribute equal amounts of a token to multiple recipients.
+ *
+ * @param args     - Token, amount per recipient, and recipient list
+ * @param source   - Distributor's Stellar public key
+ */
+export async function distribute(args: DistributeArgs, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  // Build the Soroban Vec of addresses
+  const recipientVals = args.recipients.map(r => toScValAddress(r));
+  const recipientsVec = StellarSdk.xdr.ScVal.scvVec(recipientVals);
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    toScValAddress(args.token),
+    toScValI128(args.amount),
+    recipientsVec,
+  ];
+
+  return executeContractTx(contractId, 'distribute', scArgs, source);
+}
+
+/**
+ * Distribute custom (different) amounts to multiple recipients.
+ * The amounts and recipients arrays must be the same length.
+ *
+ * @param args     - Token, per-recipient amounts, and recipient list
+ * @param source   - Distributor's Stellar public key
+ */
+export async function distributeCustom(args: DistributeCustomArgs, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  if (args.amounts.length !== args.recipients.length) {
+    throw new ContractError(
+      ContractErrorCode.InvalidAmount,
+      'Amounts and recipients arrays must be the same length',
+    );
+  }
+
+  const recipientVals = args.recipients.map(r => toScValAddress(r));
+  const amountVals = args.amounts.map(a => toScValI128(a));
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    toScValAddress(args.token),
+    StellarSdk.xdr.ScVal.scvVec(amountVals),
+    StellarSdk.xdr.ScVal.scvVec(recipientVals),
+  ];
+
+  return executeContractTx(contractId, 'distribute_custom', scArgs, source);
+}
diff --git a/src/lib/contracts/errors.ts b/src/lib/contracts/errors.ts
new file mode 100644
index 0000000..e239007
--- /dev/null
+++ b/src/lib/contracts/errors.ts
@@ -0,0 +1,92 @@
+/**
+ * Typed errors for Soroban contract interactions.
+ *
+ * Each error maps to a contract error code so the UI can show meaningful
+ * messages instead of raw hex. The error names match the contract's
+ * enum variants (NotFound, Unauthorized, etc.).
+ */
+
+export enum ContractErrorCode {
+  NotFound         = 1,
+  Unauthorized     = 2,
+  AlreadyCancelled = 3,
+  InvalidAmount    = 4,
+  InvalidTime      = 5,
+  StreamExpired    = 6,
+  NothingToWithdraw = 7,
+  ScheduleNotFound = 8,
+  NothingToClaim   = 9,
+  AlreadyRevoked   = 10,
+  SimulationFailed = 11,
+  SubmitFailed     = 12,
+  UserRejected     = 13,
+  NetworkError     = 14,
+}
+
+const ERROR_MESSAGES: Record<ContractErrorCode, string> = {
+  [ContractErrorCode.NotFound]:           'Stream not found on-chain',
+  [ContractErrorCode.Unauthorized]:       'You are not authorized for this action',
+  [ContractErrorCode.AlreadyCancelled]:   'This stream has already been cancelled',
+  [ContractErrorCode.InvalidAmount]:      'Invalid amount — must be greater than zero',
+  [ContractErrorCode.InvalidTime]:        'Invalid time range — end must be after start',
+  [ContractErrorCode.StreamExpired]:      'This stream has already expired',
+  [ContractErrorCode.NothingToWithdraw]:  'No funds available to withdraw',
+  [ContractErrorCode.ScheduleNotFound]:   'Vesting schedule not found on-chain',
+  [ContractErrorCode.NothingToClaim]:     'No vested tokens available to claim',
+  [ContractErrorCode.AlreadyRevoked]:     'This vesting schedule has already been revoked',
+  [ContractErrorCode.SimulationFailed]:   'Transaction simulation failed — check your inputs',
+  [ContractErrorCode.SubmitFailed]:       'Transaction submission failed',
+  [ContractErrorCode.UserRejected]:       'Transaction was rejected in Freighter',
+  [ContractErrorCode.NetworkError]:       'Network error — check your connection',
+};
+
+export class ContractError extends Error {
+  readonly code: ContractErrorCode;
+
+  constructor(code: ContractErrorCode, detail?: string) {
+    const base = ERROR_MESSAGES[code] ?? 'Unknown contract error';
+    super(detail ? `${base}: ${detail}` : base);
+    this.name = 'ContractError';
+    this.code = code;
+  }
+}
+
+/**
+ * Map a Soroban simulation/submit error response to a typed ContractError.
+ * Handles both raw error strings from the SDK and structured error objects
+ * from the Soroban RPC.
+ */
+export function parseContractError(err: unknown): ContractError {
+  if (err instanceof ContractError) return err;
+
+  const msg = err instanceof Error ? err.message : String(err);
+
+  // User rejected the transaction in Freighter
+  if (msg.includes('rejected') || msg.includes('denied') || msg.includes('UserDeclined')) {
+    return new ContractError(ContractErrorCode.UserRejected);
+  }
+
+  // Simulation errors from Soroban RPC
+  if (msg.includes('simulation') || msg.includes('SimulateTxFailed')) {
+    // Try to extract the contract error code from the simulation result
+    const codeMatch = msg.match(/contract_error(?:\((\d+)\))?/i);
+    if (codeMatch?.[1]) {
+      const code = Number(codeMatch[1]) as ContractErrorCode;
+      if (ERROR_MESSAGES[code]) return new ContractError(code);
+    }
+    return new ContractError(ContractErrorCode.SimulationFailed, msg);
+  }
+
+  // Network / transport errors
+  if (msg.includes('ECONNREFUSED') || msg.includes('fetch') || msg.includes('network')) {
+    return new ContractError(ContractErrorCode.NetworkError, msg);
+  }
+
+  // Transaction submission failures
+  if (msg.includes('submit') || msg.includes('TxFailed')) {
+    return new ContractError(ContractErrorCode.SubmitFailed, msg);
+  }
+
+  // Fallback: wrap as simulation failed with original message
+  return new ContractError(ContractErrorCode.SimulationFailed, msg);
+}
diff --git a/src/lib/contracts/index.ts b/src/lib/contracts/index.ts
new file mode 100644
index 0000000..54fee2b
--- /dev/null
+++ b/src/lib/contracts/index.ts
@@ -0,0 +1,21 @@
+/**
+ * Unified export for the contract service layer.
+ *
+ * Usage:
+ *   import { streams, vesting, distributor } from '@/lib/contracts';
+ *   const result = await streams.createStream({ ... }, walletAddress);
+ */
+
+import * as streamsMethods from './streams';
+import * as vestingMethods from './vesting';
+import * as distributorMethods from './distributor';
+
+export const streams    = streamsMethods;
+export const vesting    = vestingMethods;
+export const distributor = distributorMethods;
+
+// Re-export types and utilities
+export { ContractError, ContractErrorCode, parseContractError } from './errors';
+export { getRpcClient, getNetworkConfig, resetRpcClient } from './client';
+export { STREAM_CONTRACT_ID, VESTING_CONTRACT_ID, DISTRIBUTOR_CONTRACT_ID } from './constants';
+export type * from './types';
diff --git a/src/lib/contracts/network.ts b/src/lib/contracts/network.ts
new file mode 100644
index 0000000..6be1f93
--- /dev/null
+++ b/src/lib/contracts/network.ts
@@ -0,0 +1,42 @@
+/**
+ * Network configuration for Soroban RPC.
+ *
+ * Reads from NEXT_PUBLIC_* env vars so the values are baked in at build time
+ * and available in the browser bundle (they're safe to expose — RPC URLs and
+ * contract IDs are public on-chain data).
+ */
+
+export type NetworkName = 'testnet' | 'mainnet';
+
+export interface NetworkConfig {
+  name:       NetworkName;
+  sorobanRpc: string;
+  passphrase: string;
+}
+
+const NETWORK_MAP: Record<NetworkName, { rpc: string; passphrase: string }> = {
+  testnet: {
+    rpc:       'https://soroban-testnet.stellar.org',
+    passphrase: 'Test Soro Network ; December 2014',
+  },
+  mainnet: {
+    rpc:       'https://soroban-mainnet.stellar.org',
+    passphrase: 'Public Global Stellar Network ; September 2015',
+  },
+};
+
+/**
+ * Resolve the network configuration from environment variables.
+ * Falls back to testnet when unset or invalid.
+ */
+export function getNetwork(): NetworkConfig {
+  const raw = (process.env.NEXT_PUBLIC_NETWORK ?? 'testnet').toLowerCase();
+  const name: NetworkName = raw === 'mainnet' ? 'mainnet' : 'testnet';
+  const env = NETWORK_MAP[name];
+
+  return {
+    name,
+    sorobanRpc: process.env.NEXT_PUBLIC_SOROBAN_RPC_URL || env.rpc,
+    passphrase: env.passphrase,
+  };
+}
diff --git a/src/lib/contracts/streams.ts b/src/lib/contracts/streams.ts
new file mode 100644
index 0000000..f0b6a0c
--- /dev/null
+++ b/src/lib/contracts/streams.ts
@@ -0,0 +1,191 @@
+/**
+ * Stream contract method wrappers.
+ *
+ * Each function encodes the correct Soroban ScVal arguments and delegates
+ * to the core client for build → simulate → sign → submit.
+ */
+
+import * as StellarSdk from '@stellar/stellar-sdk';
+import { executeContractTx, getRpcClient, getNetworkConfig, extractSimulationResult } from './client';
+import { STREAM_CONTRACT_ID } from './constants';
+import { ContractError, ContractErrorCode, parseContractError } from './errors';
+import type { CreateStreamArgs, StreamData, TxResult } from './types';
+
+function requireContract(): string {
+  if (!STREAM_CONTRACT_ID) {
+    throw new ContractError(ContractErrorCode.NotFound, 'STREAM_CONTRACT_ID not set in env');
+  }
+  return STREAM_CONTRACT_ID;
+}
+
+// ── Helpers ─────────────────────────────────────────────────────────────────
+
+function toScValAddress(address: string): StellarSdk.xdr.ScVal {
+  return StellarSdk.Address.fromString(address).toScVal();
+}
+
+function toScValI128(value: string | bigint): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(value, { type: 'i128' });
+}
+
+function toScValU64(value: number): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(value, { type: 'u64' });
+}
+
+function toScValBytes32(hex: string): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(hex, { type: 'bytes' });
+}
+
+// ── Write Methods ───────────────────────────────────────────────────────────
+
+/**
+ * Create a new payment stream on-chain.
+ *
+ * @param args    - Stream parameters (recipient, token, amount, time range)
+ * @param source  - Sender's Stellar public key
+ * @returns TxResult with hash and ledger
+ */
+export async function createStream(args: CreateStreamArgs, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    toScValAddress(args.sender),
+    toScValAddress(args.recipient),
+    toScValAddress(args.token),
+    toScValU64(Number(args.ratePerSecond)),
+    toScValU64(args.startTime),
+    toScValU64(args.stopTime),
+  ];
+
+  return executeContractTx(contractId, 'create', scArgs, source);
+}
+
+/**
+ * Withdraw available funds from an active stream.
+ * Only callable by the stream recipient.
+ *
+ * @param streamId - The on-chain stream ID
+ * @param source   - Recipient's Stellar public key
+ */
+export async function withdrawStream(streamId: string, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    StellarSdk.nativeToScVal(streamId, { type: 'bytes' }),
+  ];
+
+  return executeContractTx(contractId, 'withdraw', scArgs, source);
+}
+
+/**
+ * Cancel an active stream. Only callable by the stream sender.
+ * Remaining funds are returned to the sender.
+ *
+ * @param streamId - The on-chain stream ID
+ * @param source   - Sender's Stellar public key
+ */
+export async function cancelStream(streamId: string, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    StellarSdk.nativeToScVal(streamId, { type: 'bytes' }),
+  ];
+
+  return executeContractTx(contractId, 'cancel', scArgs, source);
+}
+
+// ── Read Methods ────────────────────────────────────────────────────────────
+
+/**
+ * Get the current withdrawable balance for a stream.
+ * This is a read-only contract call — no signing required.
+ *
+ * @param streamId - The on-chain stream ID
+ * @param source   - Public key to simulate against
+ * @returns Balance in stroops as a bigint string
+ */
+export async function getStreamBalance(streamId: string, source: string): Promise<string> {
+  const contractId = requireContract();
+  const rpc = getRpcClient();
+  const config = getNetworkConfig();
+
+  const contract = new StellarSdk.Contract(contractId);
+  const invocation = contract.call(
+    'balance_of',
+    StellarSdk.nativeToScVal(streamId, { type: 'bytes' }),
+  );
+
+  const account = await rpc.getAccount(source);
+  const tx = new StellarSdk.TransactionBuilder(account, {
+    fee: '1000',
+    networkPassphrase: config.passphrase,
+  })
+    .addOperation(invocation)
+    .setTimeout(StellarSdk.TimeoutInfinite)
+    .build();
+
+  const response = await rpc.simulateTransaction(tx);
+
+  if (StellarSdk.rpc.Api.isSimulationError(response)) {
+    throw parseContractError(response.error);
+  }
+
+  // Extract the result — it's an i128 ScVal
+  const val = extractSimulationResult(response);
+  if (!val) return '0';
+
+  return StellarSdk.scValToNative(val).toString();
+}
+
+/**
+ * Get full stream data from the contract.
+ *
+ * @param streamId - The on-chain stream ID
+ * @param source   - Public key to simulate against
+ * @returns StreamData object
+ */
+export async function getStream(streamId: string, source: string): Promise<StreamData> {
+  const contractId = requireContract();
+  const rpc = getRpcClient();
+  const config = getNetworkConfig();
+
+  const contract = new StellarSdk.Contract(contractId);
+  const invocation = contract.call(
+    'get_stream',
+    StellarSdk.nativeToScVal(streamId, { type: 'bytes' }),
+  );
+
+  const account = await rpc.getAccount(source);
+  const tx = new StellarSdk.TransactionBuilder(account, {
+    fee: '1000',
+    networkPassphrase: config.passphrase,
+  })
+    .addOperation(invocation)
+    .setTimeout(StellarSdk.TimeoutInfinite)
+    .build();
+
+  const response = await rpc.simulateTransaction(tx);
+
+  if (StellarSdk.rpc.Api.isSimulationError(response)) {
+    throw parseContractError(response.error);
+  }
+
+  const val = extractSimulationResult(response);
+  if (!val) {
+    throw new ContractError(ContractErrorCode.NotFound, 'Empty result from get_stream');
+  }
+
+  const native = StellarSdk.scValToNative(val) as Record<string, unknown>;
+
+  return {
+    id:            String(native.id ?? streamId),
+    sender:        String(native.sender ?? ''),
+    recipient:     String(native.recipient ?? ''),
+    token:         String(native.token ?? ''),
+    ratePerSecond: String(native.rate_per_second ?? native.ratePerSecond ?? '0'),
+    startTime:     Number(native.start_time ?? native.startTime ?? 0),
+    stopTime:      Number(native.stop_time ?? native.stopTime ?? 0),
+    withdrawn:     String(native.withdrawn ?? '0'),
+    status:        (native.status as StreamData['status']) ?? 'active',
+  };
+}
diff --git a/src/lib/contracts/types.ts b/src/lib/contracts/types.ts
new file mode 100644
index 0000000..87e7e7f
--- /dev/null
+++ b/src/lib/contracts/types.ts
@@ -0,0 +1,86 @@
+/**
+ * Type definitions for Soroban contract function arguments and return values.
+ *
+ * These mirror the contract's Rust types. Amounts are strings (bigints serialized)
+ * to avoid precision loss — JavaScript numbers can't holdstroops values safely.
+ */
+
+// ── Stream Contract ─────────────────────────────────────────────────────────
+
+export interface CreateStreamArgs {
+  sender:       string;      // Sender's Stellar public key (G...)
+  recipient:    string;      // Recipient's Stellar public key (G...)
+  token:        string;      // Asset contract address or 'native'
+  ratePerSecond: string;     // Payment rate in stroops per second (u64 as string)
+  startTime:    number;      // Unix timestamp (seconds)
+  stopTime:     number;      // Unix timestamp (seconds)
+}
+
+export interface StreamData {
+  id:            string;
+  sender:        string;
+  recipient:     string;
+  token:         string;
+  ratePerSecond: string;
+  startTime:     number;
+  stopTime:      number;
+  withdrawn:     string;
+  status:        'active' | 'cancelled' | 'completed';
+}
+
+// ── Vesting Contract ────────────────────────────────────────────────────────
+
+export interface CreateVestingArgs {
+  beneficiary: string;    // Stellar public key (G...)
+  token:       string;    // Asset contract address or 'native'
+  totalAmount: string;    // Total amount in stroops
+  startTime:   number;    // Unix timestamp (seconds)
+  cliffTime:   number;    // Unix timestamp (seconds)
+  endTime:     number;    // Unix timestamp (seconds)
+}
+
+export interface VestingScheduleData {
+  id:          string;
+  beneficiary: string;
+  token:       string;
+  totalAmount: string;
+  startTime:   number;
+  cliffTime:   number;
+  endTime:     number;
+  claimed:     string;
+  revoked:     boolean;
+}
+
+// ── Distributor Contract ────────────────────────────────────────────────────
+
+export interface DistributeArgs {
+  token:    string;       // Asset contract address or 'native'
+  amount:   string;       // Amount per recipient in stroops
+  recipients: string[];   // Array of Stellar public keys
+}
+
+export interface DistributeCustomArgs {
+  token:      string;
+  amounts:    string[];    // Per-recipient amounts (parallel array with recipients)
+  recipients: string[];
+}
+
+// ── Simulation Result ───────────────────────────────────────────────────────
+
+export interface SimulationResult {
+  assembledXdr: string;    // Assembled XDR with Soroban auth/footprint (ready for signing)
+  result:       unknown;   // ScVal return value from the simulation (null if no result)
+  auth:         boolean;   // Whether authorization was needed
+  cost:         {
+    cpuInsns: string;
+    memBytes: string;
+  };
+}
+
+// ── Transaction Result ──────────────────────────────────────────────────────
+
+export interface TxResult {
+  hash:    string;
+  ledger:  number;
+  result:  string;         // Raw XDR result
+}
diff --git a/src/lib/contracts/vesting.ts b/src/lib/contracts/vesting.ts
new file mode 100644
index 0000000..4410be4
--- /dev/null
+++ b/src/lib/contracts/vesting.ts
@@ -0,0 +1,165 @@
+/**
+ * Vesting contract method wrappers.
+ */
+
+import * as StellarSdk from '@stellar/stellar-sdk';
+import { executeContractTx, getRpcClient, getNetworkConfig, extractSimulationResult } from './client';
+import { VESTING_CONTRACT_ID } from './constants';
+import { ContractError, ContractErrorCode, parseContractError } from './errors';
+import type { CreateVestingArgs, VestingScheduleData, TxResult } from './types';
+
+function requireContract(): string {
+  if (!VESTING_CONTRACT_ID) {
+    throw new ContractError(ContractErrorCode.NotFound, 'VESTING_CONTRACT_ID not set in env');
+  }
+  return VESTING_CONTRACT_ID;
+}
+
+function toScValAddress(address: string): StellarSdk.xdr.ScVal {
+  return StellarSdk.Address.fromString(address).toScVal();
+}
+
+function toScValI128(value: string | bigint): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(value, { type: 'i128' });
+}
+
+function toScValU64(value: number): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(value, { type: 'u64' });
+}
+
+function toScValBytes32(hex: string): StellarSdk.xdr.ScVal {
+  return StellarSdk.nativeToScVal(hex, { type: 'bytes' });
+}
+
+// ── Write Methods ───────────────────────────────────────────────────────────
+
+/**
+ * Create a new vesting schedule on-chain.
+ */
+export async function createVestingSchedule(args: CreateVestingArgs, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    toScValAddress(args.beneficiary),
+    toScValAddress(args.token),
+    toScValI128(args.totalAmount),
+    toScValU64(args.startTime),
+    toScValU64(args.cliffTime),
+    toScValU64(args.endTime),
+  ];
+
+  return executeContractTx(contractId, 'create_schedule', scArgs, source);
+}
+
+/**
+ * Claim vested tokens from a schedule. Only callable by the beneficiary.
+ */
+export async function claimVesting(scheduleId: string, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    StellarSdk.nativeToScVal(scheduleId, { type: 'bytes' }),
+  ];
+
+  return executeContractTx(contractId, 'claim', scArgs, source);
+}
+
+/**
+ * Revoke a vesting schedule. Only callable by the schedule creator.
+ * Unvested tokens are returned to the creator.
+ */
+export async function revokeVesting(scheduleId: string, source: string): Promise<TxResult> {
+  const contractId = requireContract();
+
+  const scArgs: StellarSdk.xdr.ScVal[] = [
+    StellarSdk.nativeToScVal(scheduleId, { type: 'bytes' }),
+  ];
+
+  return executeContractTx(contractId, 'revoke', scArgs, source);
+}
+
+// ── Read Methods ────────────────────────────────────────────────────────────
+
+/**
+ * Get the currently vested amount for a schedule (read-only).
+ */
+export async function getVestedOf(scheduleId: string, source: string): Promise<string> {
+  const contractId = requireContract();
+  const rpc = getRpcClient();
+  const config = getNetworkConfig();
+
+  const contract = new StellarSdk.Contract(contractId);
+  const invocation = contract.call(
+    'vested_of',
+    StellarSdk.nativeToScVal(scheduleId, { type: 'bytes' }),
+  );
+
+  const account = await rpc.getAccount(source);
+  const tx = new StellarSdk.TransactionBuilder(account, {
+    fee: '1000',
+    networkPassphrase: config.passphrase,
+  })
+    .addOperation(invocation)
+    .setTimeout(StellarSdk.TimeoutInfinite)
+    .build();
+
+  const response = await rpc.simulateTransaction(tx);
+
+  if (StellarSdk.rpc.Api.isSimulationError(response)) {
+    throw parseContractError(response.error);
+  }
+
+  const val = extractSimulationResult(response);
+  if (!val) return '0';
+
+  return StellarSdk.scValToNative(val).toString();
+}
+
+/**
+ * Get full vesting schedule data from the contract (read-only).
+ */
+export async function getVestingSchedule(scheduleId: string, source: string): Promise<VestingScheduleData> {
+  const contractId = requireContract();
+  const rpc = getRpcClient();
+  const config = getNetworkConfig();
+
+  const contract = new StellarSdk.Contract(contractId);
+  const invocation = contract.call(
+    'get_schedule',
+    StellarSdk.nativeToScVal(scheduleId, { type: 'bytes' }),
+  );
+
+  const account = await rpc.getAccount(source);
+  const tx = new StellarSdk.TransactionBuilder(account, {
+    fee: '1000',
+    networkPassphrase: config.passphrase,
+  })
+    .addOperation(invocation)
+    .setTimeout(StellarSdk.TimeoutInfinite)
+    .build();
+
+  const response = await rpc.simulateTransaction(tx);
+
+  if (StellarSdk.rpc.Api.isSimulationError(response)) {
+    throw parseContractError(response.error);
+  }
+
+  const val = extractSimulationResult(response);
+  if (!val) {
+    throw new ContractError(ContractErrorCode.ScheduleNotFound);
+  }
+
+  const native = StellarSdk.scValToNative(val) as Record<string, unknown>;
+
+  return {
+    id:          String(native.id ?? scheduleId),
+    beneficiary: String(native.beneficiary ?? ''),
+    token:       String(native.token ?? ''),
+    totalAmount: String(native.total_amount ?? native.totalAmount ?? '0'),
+    startTime:   Number(native.start_time ?? native.startTime ?? 0),
+    cliffTime:   Number(native.cliff_time ?? native.cliffTime ?? 0),
+    endTime:     Number(native.end_time ?? native.endTime ?? 0),
+    claimed:     String(native.claimed ?? '0'),
+    revoked:     Boolean(native.revoked),
+  };
+}
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..ee74efb
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,13 @@
+import { defineConfig } from 'vitest/config';
+import path from 'path';
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, 'src'),
+    },
+  },
+});