diff --git a/.github/workflows/acceptance.yml b/.github/workflows/acceptance.yml
index e1e5afc..35fefa7 100644
--- a/.github/workflows/acceptance.yml
+++ b/.github/workflows/acceptance.yml
@@ -1,5 +1,6 @@
-# The pool acceptance flow against testnet: mints a key, tops up on the first 402, then a streaming completion and two
-# interleaved conversations through the OpenAI SDK. The wallet in TESTNET_WALLET_PRIVATE_KEY needs testnet LCAI.
+# Testnet acceptance, from the wallet in TESTNET_WALLET_PRIVATE_KEY (it needs testnet LCAI).
+# pool: mints a key, tops up on the first 402, then a streaming completion and two interleaved conversations through
+# the OpenAI SDK. x402: keyless pay-per-call, from a fresh wallet that wallet funds and that sends the rest back.
 name: Testnet acceptance
 
 on:
@@ -32,3 +33,27 @@ jobs:
         with:
           name: acceptance-pool-${{ github.run_id }}
           path: acceptance-pool.log
+
+  # After pool, not beside it: both send from the same wallet, and two jobs at once would race for its nonce.
+  x402:
+    needs: pool
+    if: ${{ !cancelled() }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
+        with:
+          node-version: '24'
+          cache: npm
+      - run: npm ci
+      - run: npm run acceptance:x402:fresh 2>&1 | tee acceptance-x402.log
+        env:
+          FUNDER_PRIVATE_KEY: ${{ secrets.TESTNET_WALLET_PRIVATE_KEY }}
+          LIGHTCHAIN_NETWORK: testnet
+          LIGHTCHAIN_MODEL: gemma4:e2b
+      - if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: acceptance-x402-${{ github.run_id }}
+          path: acceptance-x402.log
diff --git a/.gitignore b/.gitignore
index 849ddff..1eae0cf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 dist/
+node_modules/
diff --git a/README.md b/README.md
index 6d5555c..100a75f 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ const lc = new Lightchain({
   network: "testnet",
   account: privateKeyToAccount(process.env.WALLET_PRIVATE_KEY as `0x${string}`),
   payment: "x402",
-  maxPaymentWei: 10n ** 16n, // required: the most one call may pay (0.01 LCAI)
+  maxPaymentWei: 5n * 10n ** 16n, // required: the most one call may pay (0.05 LCAI; testnet charges 0.02 a job)
   keyless: true, // or apiKey: process.env.LIGHTCHAIN_API_KEY
   onPayment: (p) => console.log(`settled in ${p.hash}, ${p.amount} wei debited`),
 });
@@ -134,9 +134,10 @@ npm run abi         # regenerate src/abi.ts from pkg/chain/abis (inside the orch
 npm run openapi     # regenerate test/fixtures/openapi.json from consumer-api's source (inside the orchestrator's sdk/)
 WALLET_PRIVATE_KEY=0x... npm run acceptance   # a fresh wallet: the key alone gets its 402, then account pays it; see scripts/acceptance.ts
 WALLET_PRIVATE_KEY=0x... LIGHTCHAIN_MODEL=gemma4:e2b npm run acceptance:x402   # keyless x402 mode; see scripts/acceptance-x402.ts
+FUNDER_PRIVATE_KEY=0x... LIGHTCHAIN_MODEL=gemma4:e2b npm run acceptance:x402:fresh   # the same, from a fresh wallet FUNDER_PRIVATE_KEY funds
 WALLET_PRIVATE_KEY=0x... npm run acceptance:pool   # streaming, and two interleaved conversations in one pooled session
 ```
 
 The fixtures in `test/fixtures` were recorded from a local devnet (`make devnet-full`, chain 48221) with Foundry's publicly known test account 7. The x402 tests sign the scheme's published test vectors (`test/fixtures/x402-vectors.json`, a copy of the orchestrator's `scripts/x402-vectors/vectors.json`) byte for byte, with Foundry's test account 3. Never use either key on a real network.
 
-CI (`.github/workflows/ci.yml`) typechecks, builds and tests every pull request and every push to `main`. `acceptance.yml` runs `acceptance:pool` against testnet every night at 03:17 UTC, and on demand from the Actions tab. It pays from the wallet in the `TESTNET_WALLET_PRIVATE_KEY` secret, which needs testnet LCAI. Each run's log is kept as an artifact.
+CI (`.github/workflows/ci.yml`) typechecks, builds and tests every pull request and every push to `main`. `acceptance.yml` runs `acceptance:pool`, then `acceptance:x402:fresh`, against testnet every night at 03:17 UTC, and on demand from the Actions tab. It pays from the wallet in the `TESTNET_WALLET_PRIVATE_KEY` secret, which needs testnet LCAI. `acceptance:x402:fresh` (`scripts/fresh-wallet.ts`) runs `acceptance:x402` with a wallet made for that run, which the secret's wallet funds and which sends what it has left back: `acceptance:x402` needs a wallet that never authorized a delegate. Each run's log is kept as an artifact.
diff --git a/package.json b/package.json
index 5420b4a..4dfbe18 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,8 @@
     "openapi": "../consumer-api/node_modules/.bin/tsx scripts/openapi.ts",
     "acceptance": "node scripts/acceptance.ts",
     "acceptance:x402": "node scripts/acceptance-x402.ts",
-    "acceptance:pool": "node scripts/acceptance-pool.ts"
+    "acceptance:pool": "node scripts/acceptance-pool.ts",
+    "acceptance:x402:fresh": "node scripts/fresh-wallet.ts acceptance:x402"
   },
   "dependencies": {
     "viem": "^2.47.6"
diff --git a/scripts/acceptance-x402.ts b/scripts/acceptance-x402.ts
index f6d0264..12d607b 100644
--- a/scripts/acceptance-x402.ts
+++ b/scripts/acceptance-x402.ts
@@ -10,7 +10,7 @@
 // LIGHTCHAIN_CHAIN_ID and LIGHTCHAIN_JOB_REGISTRY instead of LIGHTCHAIN_NETWORK.
 // LIGHTCHAIN_MODEL is required: with no key there is no /v1/models to ask.
 // Optional: LIGHTCHAIN_DEPOSIT_WEI (default 0.1 LCAI), LIGHTCHAIN_MAX_PAYMENT_WEI
-// (default 0.01 LCAI), LIGHTCHAIN_PAYER_CONCURRENCY (the server's per-payer
+// (default 0.05 LCAI), LIGHTCHAIN_PAYER_CONCURRENCY (the server's per-payer
 // limit, default 1).
 import assert from 'node:assert/strict';
 import OpenAI from 'openai';
@@ -35,7 +35,7 @@ const lc = new Lightchain({
   network,
   account: privateKeyToAccount(env.WALLET_PRIVATE_KEY as Hex),
   payment: 'x402',
-  maxPaymentWei: BigInt(env.LIGHTCHAIN_MAX_PAYMENT_WEI ?? 10n ** 16n),
+  maxPaymentWei: BigInt(env.LIGHTCHAIN_MAX_PAYMENT_WEI ?? 5n * 10n ** 16n),
   keyless: true,
   onPayment: (p) => {
     payments.push(p);
diff --git a/scripts/fresh-wallet.ts b/scripts/fresh-wallet.ts
new file mode 100644
index 0000000..2cf698d
--- /dev/null
+++ b/scripts/fresh-wallet.ts
@@ -0,0 +1,57 @@
+// Runs an npm script with a wallet made for this run alone, for a test that needs a wallet with no history (one
+// that never authorized a delegate) and must still run every night. FUNDER_PRIVATE_KEY's wallet funds it. After the
+// script, pass or fail, the fresh wallet withdraws its prepaid balance and sends all it holds back to the funder.
+//
+//   FUNDER_PRIVATE_KEY=0x... LIGHTCHAIN_MODEL=gemma4:e2b node scripts/fresh-wallet.ts acceptance:x402
+//
+// The fresh key exists only in this process and the script's environment. LIGHTCHAIN_FUND_WEI (default 0.11 LCAI:
+// acceptance:x402's 0.1 deposit, plus gas) is what a run killed before the sweep leaves behind. LIGHTCHAIN_NETWORK
+// picks the network (default testnet).
+import { spawnSync } from 'node:child_process';
+import { createPublicClient, createWalletClient, defineChain, formatEther, type Hex, http, parseAbi } from 'viem';
+import { generatePrivateKey, privateKeyToAccount } from 'viem/accounts';
+import { networks } from '../src/index.ts';
+
+const { FUNDER_PRIVATE_KEY, ...env } = process.env;
+const script = process.argv[2];
+if (!script || !FUNDER_PRIVATE_KEY) throw new Error('usage: FUNDER_PRIVATE_KEY=0x... node scripts/fresh-wallet.ts <npm script>');
+
+const network = networks[(env.LIGHTCHAIN_NETWORK ?? 'testnet') as 'mainnet' | 'testnet'];
+const chain = defineChain({
+  id: network.chainId,
+  name: `LightChain ${network.chainId}`,
+  nativeCurrency: { name: 'LightChain AI', symbol: 'LCAI', decimals: 18 },
+  rpcUrls: { default: { http: [network.rpcUrl] } },
+});
+const transport = http(network.rpcUrl);
+const chainClient = createPublicClient({ chain, transport, pollingInterval: 1_000 });
+const funder = createWalletClient({ account: privateKeyToAccount(FUNDER_PRIVATE_KEY as Hex), chain, transport });
+const key = generatePrivateKey();
+const fresh = createWalletClient({ account: privateKeyToAccount(key), chain, transport });
+const mined = async (hash: Hex) => {
+  const receipt = await chainClient.waitForTransactionReceipt({ hash });
+  if (receipt.status !== 'success') throw new Error(`transaction ${hash} reverted`);
+  return hash;
+};
+
+const fund = BigInt(env.LIGHTCHAIN_FUND_WEI ?? 11n * 10n ** 16n);
+const funded = await mined(await funder.sendTransaction({ to: fresh.account.address, value: fund }));
+console.log(`fresh wallet ${fresh.account.address}: ${formatEther(fund)} LCAI from ${funder.account.address} in ${funded}`);
+
+const run = spawnSync('npm', ['run', '-s', script], { stdio: 'inherit', env: { ...env, WALLET_PRIVATE_KEY: key } });
+
+const abi = parseAbi(['function prepaidBalanceOf(address) view returns (uint256)', 'function withdrawBalance(uint256)']);
+const address = network.jobRegistry;
+const prepaid = await chainClient.readContract({ address, abi, functionName: 'prepaidBalanceOf', args: [fresh.account.address] });
+if (prepaid > 0n) {
+  const hash = await mined(await fresh.writeContract({ address, abi, functionName: 'withdrawBalance', args: [prepaid] }));
+  console.log(`withdrew the prepaid ${formatEther(prepaid)} LCAI in ${hash}`);
+}
+// A legacy transfer at a fixed gas price costs exactly 21000 * gasPrice, so the rest can go back to the last wei.
+const gasPrice = await chainClient.getGasPrice();
+const rest = (await chainClient.getBalance({ address: fresh.account.address })) - 21_000n * gasPrice;
+if (rest > 0n) {
+  const hash = await mined(await fresh.sendTransaction({ to: funder.account.address, value: rest, gas: 21_000n, gasPrice }));
+  console.log(`returned ${formatEther(rest)} LCAI to ${funder.account.address} in ${hash}`);
+}
+process.exit(run.status ?? 1);