Your first Agent402 call in 60 seconds

curl -i "https://agent402.tools/api/search?q=x402+payment+protocol+adoption&count=5"
curl -i "https://agent402.tools/api/answer?q=what+is+the+x402+payment+protocol"

# Grab a challenge: { "challenge", "difficulty", "token", ... }
curl -s "https://agent402.tools/api/pow/challenge?slug=hash"

# Find an integer nonce so sha256("<challenge>:<nonce>") has at least
# <difficulty> leading zero bits, then send the TOKEN (not the challenge):
curl -X POST https://agent402.tools/api/hash \
  -H "Content-Type: application/json" \
  -H "X-Pow-Solution: <token>:<nonce>" \
  -d '{"text":"hello world","algo":"sha256"}'

npm install agent402-client @x402/fetch @x402/core @x402/evm viem

import { Agent402 } from "agent402-client";
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const payClient = new x402Client();
registerExactEvmScheme(payClient, { signer: privateKeyToAccount(process.env.AGENT_KEY) });
const payFetch = wrapFetchWithPayment(fetch, payClient);

const a = new Agent402({ fetch: payFetch });  // pays each call from the wallet

const found = await a.call("search", { q: "x402 payment protocol adoption", count: 5 });
const answer = await a.call("answer", { q: "what is the x402 payment protocol?" });

console.log(found.results, answer.answer, answer.citations);

const free = new Agent402();  // no fetch: proof-of-work

const result = await free.call("hash", { text: "hello world", algo: "sha256" });
console.log(result);

npm i @x402/fetch @x402/evm viem
export AGENT402_WALLET_KEY=0x...      # an EVM key holding USDC on Base
export AGENT402_MAX_PER_CALL_USD=2    # per-call ceiling checked before signing
npx agent402-openclaw proxy           # serves http://127.0.0.1:8412/v1

from openai import OpenAI
client = OpenAI(base_url="http://127.0.0.1:8412/v1", api_key="unused")
r = client.chat.completions.create(model="auto", messages=[{"role": "user", "content": "hi"}])

npm install agent402-openai-tools
# also: agent402-anthropic-tools, agent402-ai-sdk

import { agent402Tools } from "agent402-openai-tools";
// same shape: agent402-anthropic-tools
// payFetch: the wallet-paying fetch from the Pay with USDC tab

// web search, then a cited answer: both paid per call from the wallet
const { tools, execute } = await agent402Tools({ slugs: ["search", "answer"], freeOnly: false, fetch: payFetch });

// pass tools to your LLM call, e.g. "search the web for x402 adoption, then answer: what is x402?"
// for each tool_call it returns, run:
const result = await execute(call.function.name, JSON.parse(call.function.arguments));

// agent402-ai-sdk returns four meta tools instead, keyed by name:
// const tools = await agent402Tools({ fetch: payFetch }); await generateText({ model, tools, prompt });

// free tier: every compute-payable tool, paid with proof-of-work
const { tools, execute } = await agent402Tools({ slugs: ["hash", "markdown-to-html"] });

npm install @x402/fetch @x402/core @x402/evm viem

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // @x402/core 2.23+ refuses anything over $1 or off the pegged-asset list by default; keep your own ceiling in code instead
registerExactEvmScheme(client, {
  signer: privateKeyToAccount(process.env.AGENT_KEY)
});
const payFetch = wrapFetchWithPayment(fetch, client);

// web search, then a cited answer: each call quoted by its 402, then paid and retried
const q = (s) => encodeURIComponent(s);
const found = await (await payFetch("https://agent402.tools/api/search?q=" + q("x402 payment protocol adoption") + "&count=5")).json();
const answer = await (await payFetch("https://agent402.tools/api/answer?q=" + q("what is the x402 payment protocol?"))).json();

console.log(found.results, answer.answer, answer.citations);