Prove HTTP 402 on your stack

npm i @x402/fetch @x402/evm @x402/core viem

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

const url = "https://next-demo.smidgen.io/premium/locked";
const key = process.env.EVM_PRIVATE_KEY as `0x${string}` | undefined;
if (!key) {
  throw new Error("Set EVM_PRIVATE_KEY to a funded Base wallet (0x…)");
}

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(key) });

const fetchWithPayment = wrapFetchWithPayment(fetch, client);

async function main() {
  const response = await fetchWithPayment(url, {
    headers: {
      Accept: "application/json, text/html;q=0.9,*/*;q=0.8",
      "User-Agent": "smidgen-agent-example/1.0",
    },
  });
  console.log("HTTP", response.status);
  console.log(await response.text());
}

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