← Clawy  /  快速开始

通过 x402 调用付费 AI API — 仅需 5 分钟

无需 API 密钥、无需注册。你请求一个端点，服务器返回 402 和价格，你的客户端在 Base 上签署一次性 USDC 授权并重试。下面是完整的单文件可运行示例。

你需要什么

• Node.js 18+ 和一个依赖：npm i viem
• 一个钱包私钥，其地址持有少量 Base 主网上的 USDC（几美分即可测试）。
• 别无他物 —— 无账户、无密钥配置、无控制台。

流程

可复制粘贴的客户端

保存为 pay-and-call.mjs，然后运行 X402_PRIVATE_KEY=0x... node pay-and-call.mjs：

// pay-and-call.mjs — pay Clawy in USDC over x402 and read the answer.
// Setup:  npm i viem
import { privateKeyToAccount } from "viem/accounts";
import { randomBytes } from "crypto";

const GATEWAY  = "https://clawy.uk";
const ENDPOINT = "/v1/chat/auto";  // cheapest tier: $0.04 USDC/call
const MESSAGE  = "Reply with exactly: HELLO";
const USDC     = "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"; // USDC on Base
const CHAIN_ID = 8453;                                          // Base mainnet

const account = privateKeyToAccount(process.env.X402_PRIVATE_KEY);
const body = JSON.stringify({ messages: [{ role: "user", content: MESSAGE }] });
const headers = { "Content-Type": "application/json" };

// 1) Unpaid request -> 402 with the price in the PAYMENT-REQUIRED header
const r1 = await fetch(GATEWAY + ENDPOINT, { method: "POST", headers, body });
if (r1.status !== 402) throw new Error("expected 402, got " + r1.status);
const reqs = JSON.parse(Buffer.from(r1.headers.get("payment-required"), "base64").toString());
const a = reqs.accepts[0];   // { scheme:"exact", network, amount, payTo, ... }
console.log("price:", a.amount, "(6-dp USDC) ->", a.payTo);

// 2) Sign an EIP-3009 transferWithAuthorization for the exact amount
const nonce = "0x" + randomBytes(32).toString("hex");
const validBefore = BigInt(Math.floor(Date.now() / 1000) + 300); // valid 5 min
const signature = await account.signTypedData({
  domain: { name: "USD Coin", version: "2", chainId: CHAIN_ID, verifyingContract: USDC },
  types: { TransferWithAuthorization: [
    { name: "from", type: "address" }, { name: "to", type: "address" },
    { name: "value", type: "uint256" }, { name: "validAfter", type: "uint256" },
    { name: "validBefore", type: "uint256" }, { name: "nonce", type: "bytes32" },
  ] },
  primaryType: "TransferWithAuthorization",
  message: { from: account.address, to: a.payTo, value: BigInt(a.amount),
             validAfter: 0n, validBefore, nonce },
});

// 3) Build the X-PAYMENT header and retry -> 200 + OpenAI-shape response
const xPayment = Buffer.from(JSON.stringify({
  x402Version: 2, scheme: "exact", network: a.network,
  payload: { signature, authorization: {
    from: account.address, to: a.payTo, value: a.amount,
    validAfter: "0", validBefore: validBefore.toString(), nonce } },
})).toString("base64");

const r2 = await fetch(GATEWAY + ENDPOINT, {
  method: "POST", headers: { ...headers, "X-PAYMENT": xPayment }, body,
});
const out = await r2.json();
console.log(out.choices[0].message.content);  // -> HELLO
console.log("served by:", out.x_clawy?.provider);

这是最简可行路径。生产环境请加上余额与错误处理 —— 更完整的参考（测试网支持、余额检查、dry-run）在仓库中的 scripts/x402-client.mjs。

面向 AI 智能体（无需人工）

发现文件让自主客户端自行找到 Clawy、查询价格并调用：

• /llms.txt — 面向 LLM 客户端的一页式摘要
• /openapi.json — 带每端点支付信息的 OpenAPI 3.1 规范
• /.well-known/x402.json — x402 Bazaar 清单（输入/输出 schema）
• /.well-known/agent-services.json — agent-services 目录
• /health — 实时状态 + 当前价格