x402 Protocol

import { ethers } from 'ethers';

// 1. Create payment proof
const signer = new ethers.Wallet(privateKey);
const requestId = `req_${Date.now()}`;
const amount = 1000; // cents
const timestamp = Date.now();

const message = `PromptPort Payment
Request ID: ${requestId}
Amount: ${amount} USDC cents
Timestamp: ${timestamp}`;

const signature = await signer.signMessage(message);

// 2. Send request with payment
const response = await fetch('https://api.chat402.xyz/api/v1/prompt', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    model: 'gpt-4',
    prompt: 'Your question',
    payment: {
      from: await signer.getAddress(),
      amount,
      signature,
      timestamp,
      requestId,
      network: 'ethereum'
    }
  })
});