💳 Pay‑per‑call with x402

import axios from "axios";
import { withPaymentInterceptor } from "x402-axios";
import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { baseSepolia } from "viem/chains";

// Create a wallet account per the x402 Quickstart
const account = privateKeyToAccount(process.env.PRIVATE_KEY);

// Wrap axios instance with x402 payment handling (pass your wallet account)
const api = withPaymentInterceptor(
  axios.create({ baseURL: "https://api.tokenmetrics.com" }),
  account,
);

const res = await api.get("/v2/trading-signals", {
  headers: {
    "x-coinbase-402": "true",
    "x-payment-token": "usdc", // or "tmai" for 10% discount
  },
});
console.log(res.data);

from x402.clients.httpx import x402HttpxClient
from eth_account import Account
import asyncio
import os

async def main():
    # Create a wallet account per the x402 Quickstart
    account = Account.from_key(os.environ["PRIVATE_KEY"])

    # Use x402 HTTPX client with your wallet account
    async with x402HttpxClient(account=account, base_url="https://api.tokenmetrics.com") as client:
        r = await client.get(
            "/v2/trading-signals",
            headers={
                "x-coinbase-402": "true",
                "x-payment-token": "tmai",  # 10% discount
            },
        )
        print(await r.aread())

asyncio.run(main())

// 200 TMAI in base units (wei): 200 * 10^18
const maxTmaiWei = 200n * 1000000000000000000n;

// Pass this as the max/spend limit to your x402 client options
// Example (option name may vary by client):
// const api = withPaymentInterceptor(axios.create({ baseURL }), account, { maxPayment: maxTmaiWei });

# 200 TMAI in base units (wei): 200 * 10^18
max_tmai_wei = 200 * (10 ** 18)

# Pass this as the max/spend limit to your x402 client options
# Example (option name may vary by client):
# async with x402HttpxClient(account=account, base_url=base_url, max_payment=max_tmai_wei) as client: