Test x402 payments

PAYMENT_STUB_MODE=true PRUDRA_API_KEY=prv_test_sk_... npx ts-node server.ts

import { ethers } from 'ethers';
import {
  signX402Payment,
  decodePaymentRequirements,
  selectPaymentOption,
} from '@prudra/payments';

const SERVER_URL = 'http://localhost:4001';

async function runX402Agent() {
  // Any private key works in stub mode — no real USDC needed
  const agentWallet = new ethers.Wallet(process.env.AGENT_PRIVATE_KEY!);
  console.log('Agent wallet:', agentWallet.address);

  // Step 1: Request without payment — expect 402
  console.log('\nStep 1: Request endpoint without payment');
  const r1 = await fetch(`${SERVER_URL}/summarise`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ text: 'Summarise this for me please' }),
  });

  console.log('Status:', r1.status); // expected: 402

  const x402Header = r1.headers.get('payment-required');
  const mppHeader  = r1.headers.get('www-authenticate');
  console.log('x402 header present:', !!x402Header);
  console.log('MPP header present:', !!mppHeader);

  // Step 2: Decode payment requirements
  console.log('\nStep 2: Decode PAYMENT-REQUIRED');
  const requirements = decodePaymentRequirements(x402Header!);
  const option = selectPaymentOption(requirements, 'USDC');

  console.log('Network:', option.network);
  console.log('Amount:', option.maxAmountRequired, 'base units');
  console.log('Pay to:', option.payTo);

  // Step 3: Sign ERC-3009 authorization (off-chain — no gas cost)
  console.log('\nStep 3: Sign ERC-3009 authorization');
  const { xPaymentHeader, validBefore, from } = await signX402Payment(
    agentWallet,
    option,
  );
  console.log('Signed by:', from);
  console.log('Valid until:', new Date(validBefore * 1000).toISOString());

  // Step 4: Resubmit with payment signature
  console.log('\nStep 4: Resubmit with PAYMENT-SIGNATURE');
  const r2 = await fetch(`${SERVER_URL}/summarise`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'PAYMENT-SIGNATURE': xPaymentHeader,
    },
    body: JSON.stringify({ text: 'Summarise this for me please' }),
  });

  console.log('Status:', r2.status); // expected: 200

  // Step 5: Read the result and settlement details
  const result = await r2.json();
  console.log('\nResult:', JSON.stringify(result, null, 2));

  const paymentResponse = r2.headers.get('payment-response');
  if (paymentResponse) {
    const settlement = JSON.parse(Buffer.from(paymentResponse, 'base64').toString());
    console.log('\nSettlement (PAYMENT-RESPONSE header):', JSON.stringify(settlement, null, 2));
  }

  console.log('\nVault ID:', result.vaultId);
  console.log('Protocol:', result.payment?.protocol); // 'x402'
}

runX402Agent().catch(err => {
  console.error('Fatal:', err.message);
  process.exit(1);
});

# Install dependencies
npm install ethers @prudra/payments

# Run with a test private key (any key works in stub mode)
AGENT_PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 \
  npx ts-node example-06-x402-agent.ts

Agent wallet: 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266

Step 1: Request endpoint without payment
Status: 402
x402 header present: true
MPP header present: true

Step 2: Decode PAYMENT-REQUIRED
Network: base-mainnet
Amount: 10000 base units
Pay to: 0x742d35Cc...

Step 3: Sign ERC-3009 authorization
Signed by: 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266
Valid until: 2026-04-30T09:05:00.000Z

Step 4: Resubmit with PAYMENT-SIGNATURE
Status: 200

Result: {
  "vaultId": "vlt_clx1abc123",
  "summary": "Summary of \"Summarise this for me please...\"",
  "payment": { "protocol": "x402", "txHash": "0xabc..." }
}

Settlement (PAYMENT-RESPONSE header): {
  "txHash": "0xabc...",
  "settlementPending": false,
  "network": "base-mainnet"
}

Vault ID: vlt_clx1abc123
Protocol: x402