RailBridge AI Documentation

The Interoperability Layer for Agentic Commerce

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Setting up your first API call should be the easiest part of getting started. Compliant with Coinbase's x402 standard.

No guesswork, no complexity. Just your first successful agentic payment.

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client.js

// Create signer from private key
const signer = privateKeyToAccount(process.env.CLIENT_PRIVATE_KEY as `0x${string}`);

// Create viem wallet client for signing
const viemClient = createWalletClient({
  account: signer,
  chain: baseSepolia,
  transport: http(process.env.EVM_RPC_URL || "https://sepolia.base.org"),
});

// Create x402 client
const client = new x402Client();

// Register EVM scheme - this is all you need!
// Works for both same-chain and cross-chain payments
registerExactEvmScheme(client, { signer });

// Wrap fetch with payment handling
const fetchWithPayment = wrapFetchWithPayment(fetch, client);

// Make payment-protected request
const response = await fetchWithPayment("http://localhost:4021/api/premium");

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