Migration: x402 V1 to V2

import { wrapFetchWithPayment } from "x402-fetch";
import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { polygonAmoy } from "viem/chains";

const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const walletClient = createWalletClient({
  account,
  chain: polygonAmoy,
  transport: http(),
});

const fetchWithPayment = wrapFetchWithPayment(fetch, walletClient);
const response = await fetchWithPayment("https://api.example.com/paid-endpoint");

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

const signer = privateKeyToAccount(process.env.EVM_PRIVATE_KEY as `0x${string}`);

const client = new x402Client();
client.register("eip155:*", new ExactEvmScheme(signer));

const fetchWithPayment = wrapFetchWithPayment(fetch, client);
const response = await fetchWithPayment("https://api.example.com/paid-endpoint");

import { paymentMiddleware } from "x402-express";

app.use(
  paymentMiddleware(
    "0xYourAddress",
    {
      "GET /weather": {
        price: "$0.001",
        network: "polygon-amoy",
        config: { description: "Weather data" },
      },
    },
    { url: "https://x402-amoy.polygon.technology" }
  )
);

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

const payTo = "0xYourAddress";

const facilitatorClient = new HTTPFacilitatorClient({
  url: "https://x402-amoy.polygon.technology",
});

app.use(
  paymentMiddleware(
    {
      "GET /weather": {
        accepts: [
          {
            scheme: "exact",
            price: "$0.001",
            network: "eip155:80002",
            payTo,
          },
        ],
        description: "Weather data",
        mimeType: "application/json",
      },
    },
    new x402ResourceServer(facilitatorClient).register(
      "eip155:80002",
      new ExactEvmScheme()
    )
  )
);

# Buyers
npm install @x402/fetch @x402/core @x402/evm viem

# Sellers (Express)
npm install @x402/express @x402/core @x402/evm express

// V1
const payment = req.header("X-PAYMENT");
res.setHeader("X-PAYMENT-RESPONSE", responseData);

// V2
const payment = req.header("PAYMENT-SIGNATURE");
res.setHeader("PAYMENT-RESPONSE", responseData);

npm install @x402/axios @x402/core @x402/evm
# Sellers
npm install @x402/express @x402/core @x402/evm