Let your AI helper pay by itself.

pip install "x402[httpx,evm]" eth-account
export EVM_PRIVATE_KEY=0x...   # key of YOUR Base wallet that holds USDC

import asyncio, os
from eth_account import Account
from x402 import x402Client
from x402.http.clients import x402HttpxClient
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact import register_exact_evm_client

URL = "https://data.truefixr.com/v1/weather/batch"
BODY = {"locations": [{"lat": 32.78, "lon": -96.80}]}

async def main():
    acct = Account.from_key(os.environ["EVM_PRIVATE_KEY"])
    client = x402Client()
    register_exact_evm_client(client, EthAccountSigner(acct))
    async with x402HttpxClient(client) as http:
        r = await http.post(URL, json=BODY)   # 402, pay, retry: all inside
        await r.aread()
        print(r.status_code, r.text[:300])

asyncio.run(main())

npm install @x402/fetch @x402/core @x402/evm viem
export EVM_PRIVATE_KEY=0x...   # key of YOUR Base wallet that holds USDC

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

const res = await pay("https://data.truefixr.com/v1/weather/batch", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({ locations: [{ lat: 32.78, lon: -96.80 }] }),
});
console.log(res.status, await res.json());