Pay per request

import { wrapFetchWithPaymentFromConfig, decodePaymentResponseHeader } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.WALLET_PRIVATE_KEY as `0x${string}`);
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:*", client: new ExactEvmScheme(account) }],
});

const response = await fetchWithPayment("https://api.brandfetch.io/v2/brands/nike.com");
const brand = await response.json();
const receipt = decodePaymentResponseHeader(response.headers.get("PAYMENT-RESPONSE")!);
console.log(brand.name, receipt.transaction);

# pip install "x402[evm,httpx]"
import os

import httpx
from eth_account import Account
from x402 import x402ClientSync
from x402.http.utils import (
    decode_payment_required_header,
    decode_payment_response_header,
    encode_payment_signature_header,
)
from x402.mechanisms.evm.exact.client import ExactEvmScheme

account = Account.from_key(os.environ["WALLET_PRIVATE_KEY"])
url = "https://api.brandfetch.io/v2/brands/nike.com"

with httpx.Client() as http:
    challenge = http.get(url)  # 402
    required = decode_payment_required_header(challenge.headers["payment-required"])
    client = x402ClientSync()
    for option in required.accepts:
        client.register(option.network, ExactEvmScheme(account))
    payment = encode_payment_signature_header(client.create_payment_payload(required))

    paid = http.get(url, headers={"PAYMENT-SIGNATURE": payment})
    brand = paid.json()
    receipt = decode_payment_response_header(paid.headers["payment-response"])