x402-farm

64 pay-per-call APIs that AI agents pay for autonomously — via the x402 protocol (USDC on Base). No account, no API key, no subscription: the agent gets an HTTP 402, signs a micro-payment, retries, gets the data. Settlement is on-chain, per call, from $0.002.

Live at api.x-402.online · MCP: online.x-402/mcp on the official registry and Smithery

Try it in 60 seconds

Free taste, no wallet — every client gets 1 free call per day on any data route ≤ $0.01. Just call:

curl "https://api.x-402.online/v1/weather?city=Tokyo"
curl "https://api.x-402.online/v1/crypto/price?ids=bitcoin,ethereum&vs=usd"

Paid, with any x402 client (funded USDC wallet on Base):

import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const f = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(privateKeyToAccount(PRIVATE_KEY)) }],
});
const r = await f("https://api.x-402.online/v1/search?q=x402"); // $0.003, settled on-chain
console.log(await r.json());

Related MCP server: x402-agent-data

What's inside

Full machine-readable docs: /llms.txt · /openapi.json · /.well-known/x402

Agent-friendly by design

• Every route accepts GET and POST (query params or JSON body — your call)

• Progressive pricing: big composites have a /partial LITE version from $0.02; every 402 response advertises the cheaper alternative and free trial in an alternatives field

• MCP server at /mcp (JSON-RPC, Streamable HTTP): 64 tools, x402 payment relayed end-to-end — proven on-chain

• Multi-surface discovery: Bazaar extensions, llms.txt, OpenAPI, agent-skills, Link headers

Architecture

Vercel (paywall x402 + fast APIs) → Cloudflare named tunnel → Mac mini worker (residential IP, real Chromium, auth-gated sources like INPI) with automatic datacenter fallback. Analytics + a daily on-chain market radar (unique payers per service across the whole x402 ecosystem) drive which APIs live or die.

Stack

Express · @x402/express (multi-network resource server) · Coinbase CDP facilitator · Supabase (analytics) · Playwright · deployed on Vercel + a Mac mini.

Built by Laurent Halbrun. USDC revenue wallet: 0x2c87…735F — every sale is verifiable on-chain.