x402 API in TEE

Step 0 : Get Base Sepolia USDC (Make sure to select Base Sepolia in the network dropdown)

Step 1: Install required dependencies

npm install viem x402-fetch dotenv @phala/dstack-sdk

Step 2: Use the following code to make API calls

import { privateKeyToAccount } from "viem/accounts";
import { wrapFetchWithPayment, decodeXPaymentResponse } from "x402-fetch";
import { TappdClient } from "@phala/dstack-sdk";
import dotenv from "dotenv";

dotenv.config();

// Set your secret salt in .env file
const client = new TappdClient();
const account = await client.deriveKey(process.env.DSTACK_SECRET_SALT);
// Set max payment amount to 1 USDC
const fetchWithPayment = wrapFetchWithPayment(fetch, account, 1);

// Example API call
const url = "https://x402.incipient.ltd/text-to-image?prompt=a%20blue%20ball";

fetchWithPayment(url, {
  method: "GET",
})
  .then(async (response) => {
    const body = await response.json();
    console.log(body);
  })
  .catch((error) => {
    console.error(error.response?.data?.error);
  });