x402 Payment API

npm install @x402/fetch @x402/evm viem

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

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

// Create x402 client and register EVM scheme
const client = new x402Client();
registerExactEvmScheme(client, { signer });

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

// Make request - payment is handled automatically!
const response = await fetchWithPayment(
  "https://payment.unreel.ai/api/generate-x402",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      script_text: "A cat walking on a rainbow bridge in space",
    }),
  }
);

const { job_id, status_url } = await response.json();
console.log("Job created:", job_id);

// Poll for completion
const pollForResult = async (url: string) => {
  while (true) {
    const res = await fetch(url);
    const job = await res.json();
    if (job.status === "completed") return job.video_url;
    if (job.status === "failed") throw new Error(job.error);
    await new Promise(r => setTimeout(r, 10000));
  }
};

const videoUrl = await pollForResult(status_url);
console.log("Video ready:", videoUrl);

{
  "x402Version": 2,
  "accepts": [{
    "scheme": "exact",
    "network": "eip155:8453",
    "amount": "25000000",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "payTo": "0xf50ccDFEf8E0816757e8E491ad70D1CfD2261a50",
    "maxTimeoutSeconds": 300
  }],
  "resource": {
    "url": "https://payment.unreel.ai/api/generate-x402",
    "description": "Generate AI video from natural language script"
  }
}