Celo Sepolia sandbox

{
  "asset": "0x01C5C0122039549AD1493B8220cABEdD739BC44E",
  "symbol": "USDC",
  "decimals": 6,
  "name": "USDC",
  "version": "2",
  "assetTransferMethod": "eip3009"
}

curl https://api.x402go.online/supported

FACILITATOR_URL=https://api.x402go.online
FACILITATOR_API_KEY=your_api_key
PAY_TO=your_payment_address

NETWORK=eip155:11142220
ASSET=0x01C5C0122039549AD1493B8220cABEdD739BC44E
ASSET_NAME=USDC
ASSET_VERSION=2
AMOUNT=10000
METHOD=eip3009

npx tsx server.ts
curl -i http://localhost:3000/paid

// wallet.ts
import { generatePrivateKey, privateKeyToAccount } from 'viem/accounts';

const key = generatePrivateKey();
console.log(`EVM_PRIVATE_KEY=${key}`);
console.log(`Address: ${privateKeyToAccount(key).address}`);

npx tsx wallet.ts

npm install @x402/fetch @x402/core @x402/evm viem dotenv
npm install -D typescript tsx @types/node

EVM_PRIVATE_KEY=0xyour_test_wallet_key
# SERVER_URL=http://localhost:3000/paid

import 'dotenv/config';
import { privateKeyToAccount } from 'viem/accounts';
import { x402Client } from '@x402/core/client';
import { ExactEvmScheme } from '@x402/evm/exact/client';
import { wrapFetchWithPayment, x402HTTPClient } from '@x402/fetch';

const NETWORK = 'eip155:11142220';
const USDC = '0x01C5C0122039549AD1493B8220cABEdD739BC44E';

async function main() {
  const key = process.env.EVM_PRIVATE_KEY;
  if (!key) throw new Error('Missing environment variable: EVM_PRIVATE_KEY');
  const signer = privateKeyToAccount(key as `0x${string}`);

  const client = x402Client.fromConfig({
    schemes: [{ network: 'eip155:*', client: new ExactEvmScheme(signer) }],
    spendControls: {
      // Opt in to this token, capped at 1 USDC per payment (6 decimals).
      allowedAssets: [{ network: NETWORK, asset: USDC, maxAmountPerPayment: '1000000' }],
    },
  });

  const fetchWithPayment = wrapFetchWithPayment(fetch, client);
  const httpClient = new x402HTTPClient(client);

  const url = process.env.SERVER_URL ?? 'http://localhost:3000/paid';
  console.log(`Paying ${url} from ${signer.address}`);

  const response = await fetchWithPayment(url, { method: 'GET' });
  const result = await httpClient.processResponse(response);

  console.log('Status:', response.status);
  console.log('Body:', result.body);

  if (result.paymentStatus === 'settled') {
    console.log('Payment settled:', result.header);
  } else {
    console.error('Payment not settled:', result.paymentStatus, result.header);
    process.exitCode = 1;
  }
}

main().catch((error) => {
  console.error(error);
  process.exit(1);
});

npx tsx client.ts