Show HN: Web tools an AI agent pays for per call in USDC, no API key (x402+MCP)
Superhighway is a web-search API designed for AI agents: no signup, no API key, and agents pay per call (0.001 USDC each) via the x402 protocol on Base. The API returns clean JSON results, and the entire payment flow is automated, requiring zero human involvement.
Superhighway — the web-search API agents can pay for
🛣️ agent-native
Superhighway
The information superhighway, productized for agents. A web-search API your AI agent can pay for on its own — no signup, no API key, no human in the loop.
$0.001 per search, paid in USDC on base via the x402 protocol.
How it works
Your agent GETs /search?q=....
It gets back 402 Payment Required with the price and where to pay.
An x402 client signs a USDC payment and retries automatically.
It gets clean JSON search results. Total human involvement: zero.
Try it
Unpaid request — see the 402 and its payment terms:
curl -i "https://api-production-17e1.up.railway.app/search?q=best+espresso+machines"
Paid request — with an x402 client (TypeScript):
import { wrapFetchWithPayment, createSigner } from "x402-fetch";
const signer = await createSigner("base", process.env.AGENT_PRIVATE_KEY); const pay = wrapFetchWithPayment(fetch, signer);
const res = await pay("https://api-production-17e1.up.railway.app/search?q=best+espresso+machines"); console.log(await res.json());
For agents
Machine-readable spec: /openapi.json · Health: /health
Built on SearXNG + x402. One query at a time, paid as you go.