AI Agents Pricing

Prerequisites

• Node.js and npm
• A crypto wallet with BASE-USDC (use eip155:84532 for testnet)

1. Install dependencies

npm install @x402/fetch @x402/evm viem

2. Example: buyer.js (update privateKey)

const { wrapFetchWithPayment } = require("@x402/fetch");
const { x402Client, x402HTTPClient } = require("@x402/core/client");
const { ExactEvmScheme } = require("@x402/evm/exact/client");
const { privateKeyToAccount } = require("viem/accounts");

async function main() {
  const key = ""; // Private key of your BASE-USDC
  const signer = privateKeyToAccount(key);

  const client = new x402Client();
  client.register("eip155:8453", new ExactEvmScheme(signer)); // eip155:84532 for testnet

  const fetchWithPayment = wrapFetchWithPayment(fetch, client);

  const response = await fetchWithPayment(
    "https://api.chainaware.ai/api/fraud/audit",
    {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        network: "ETH",
        walletAddress: "vitalik.eth"
      }),
    }
  );

  const data = await response.json();
  console.log("Response:", data);

  if (response.ok) {
    const httpClient = new x402HTTPClient(client);
    const paymentResponse = httpClient.getPaymentSettleResponse(
      (name) => response.headers.get(name)
    );
    console.log("Payment settled:", paymentResponse);
  }
}
main();

3. Run the script

node buyer.js

Full integration steps, wallet signer setup, and error handling: x402 Quickstart for Buyers.