Express

PRIVATE_KEY=0xYourPrivateKey
PAY_TO=0xYourSellerAddress

import express from "express";
import { paymentMiddlewareFromConfig } from "@4mica/x402/server/express";

const app = express();
app.use(express.json());

app.use(
  paymentMiddlewareFromConfig({
    "GET /premium-content": {
      accepts: {
        scheme: "4mica-credit",
        price: "$0.10",
        network: "eip155:84532",
        payTo: process.env.PAY_TO ?? "0xYourAddress",
      },
      description: "Access to premium content",
    },
  }),
);

app.get("/premium-content", (req, res) => {
  res.json({ message: "This is premium content behind a paywall" });
});

app.listen(3030, () => {
  console.log("Server running on http://localhost:3030");
});

import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { FourMicaEvmScheme } from "@4mica/x402/client";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const scheme = await FourMicaEvmScheme.create(account);

const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:84532", client: scheme }],
});

const response = await fetchWithPayment("http://localhost:3030/premium-content");
const data = await response.json();

console.log(data);