NanoTools — x402 pay-per-call API for AI agents

44 tools. No signup. No API keys. Pure x402 micropayments on Base mainnet.

Agents pay per call with USDC ($0.001–$0.03) via the x402 protocol — the HTTP 402 flow is fully automatic with any x402-capable client/wallet.

🔗 Discovery endpoints

What	URL
Tool catalog for LLMs	https://nano.stacknodehost.com/llms.txt
OpenAPI 3 spec (x402 prices in extensions)	https://nano.stacknodehost.com/openapi.json
x402 discovery	https://nano.stacknodehost.com/.well-known/x402
A2A agent card	https://nano.stacknodehost.com/.well-known/agent.json
Health	https://nano.stacknodehost.com/health

🧰 Tool groups

• Trends & SERP — Google Trends (timeline, related queries, regions), Google SERP, Yandex SERP, wordstat regions
• SEO — meta audit, robots.txt audit, readability audit, IndexNow submit
• Chromium tools — page screenshot, page PDF, OG-image generation (real headless Chromium)
• Data — weather (open-meteo), FX rates (ECB), whois (RDAP), RSS parse
• Utilities — QR, JWT, cron parse, hash, uuid, base64, url encode, slug, datetime, ... ($0.001 tier)

💳 Payment

x402 ExactEvmScheme on Base (eip155:8453), payTo 0x4F568Bf0cE8537CBE7a0DAF1A43C955e0a648db9, facilitator https://facilitator.openx402.ai. Prices are declared per-tool in the discovery endpoints (x-price-usd extension in OpenAPI).

🚀 Quick start with any x402 client

Point your agent at any tool URL from llms.txt — the first call returns 402 with payment requirements, the client signs USDC, retries with X-PAYMENT header and gets the result.