Quick Start

import { config } from "dotenv";
import express from "express";
import { paymentMiddleware, x402ResourceServer } from "@x402/express";
import { ExactEvmScheme } from "@x402/evm/exact/server";
import { HTTPFacilitatorClient } from "@x402/core/server";

config();

const evmAddress = process.env.EVM_ADDRESS as `0x${string}`;
const facilitatorUrl = "https://facilitator.0xmeta.ai/v1";

const facilitatorClient = new HTTPFacilitatorClient({ url: facilitatorUrl });
const app = express();

app.use(
  paymentMiddleware(
    {
      "GET /weather": {
        accepts: [{
          scheme: "exact",
          price: "$0.02",              // Your price + $0.01 fee
          network: "eip155:84532",      // Base Sepolia
          payTo: evmAddress,            // YOUR address
        }],
        description: "Weather data"
      }
    },
    new x402ResourceServer(facilitatorClient)
      .register("eip155:84532", new ExactEvmScheme())
  )
);

app.get("/weather", (req, res) => {
  res.send({ weather: "sunny", temperature: 70 });
});

app.listen(4021, () => {
  console.log(`Server ready at http://localhost:4021`);
});

import { config } from "dotenv";
import express from "express";
import { paymentMiddleware } from "x402-express";

config();

const evmAddress = process.env.EVM_ADDRESS as `0x${string}`;
const facilitatorUrl = "https://facilitator.0xmeta.ai/v1";

const app = express();

app.use(
  paymentMiddleware(
    evmAddress,  // YOUR address
    {
      "GET /weather": {
        price: "$0.02",
        network: "base-sepolia",
      }
    },
    { url: facilitatorUrl }
  )
);

app.get("/weather", (req, res) => {
  res.send({ weather: "sunny", temperature: 70 });
});

app.listen(4021);

# YOUR merchant address (receives customer payments)
EVM_ADDRESS=0xA821f428Ef8cC9f54A9915336A82220853059090

# Facilitator URL
FACILITATOR_URL=https://facilitator.0xmeta.ai/v1

npm install @x402/express @x402/evm @x402/core express dotenv

npm install x402-express express dotenv