Surf

Pay-per-use API gateway for AI agents. Inference, Twitter data, and web crawling - no API keys, no subscriptions. Pay per request with USDC via the x402 protocol.

Live at surf.cascade.fyi

Services

Service	Domain	Price	Networks
Inference - LLM chat completions (Kimi K2.5, MiniMax M2.5)	inference.surf.cascade.fyi	$0.002-0.003	Solana
Twitter - Search tweets, fetch users and tweets	twitter.surf.cascade.fyi	$0.003	Solana, Base
Web - Crawl pages, search via Exa	web.surf.cascade.fyi	$0.005-0.01	Solana, Base

Quick start

npm install @x402/fetch

import { wrapFetch } from "@x402/fetch";

const x402Fetch = wrapFetch(fetch, walletClient);

const res = await x402Fetch(
  "https://inference.surf.cascade.fyi/v1/chat/completions",
  {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      model: "moonshotai/kimi-k2.5",
      messages: [{ role: "user", content: "Hello!" }],
    }),
  },
);

const data = await res.json();

Claude Code skills

Surf ships Claude Code skills that teach the agent how to call each API:

npx skills add cascade-protocol/surf -g

Installs three skills: surf-inference, surf-twitter, surf-web.

Development

pnpm install
pnpm dev        # Start dev server
pnpm check      # Type-check + lint

License

Apache-2.0