Book402 — AI-Native Book Knowledge API

● healthy search

3,807 books searchable via API. AI agents pay per query with USDC on Base. No API keys, no subscriptions — just HTTP 402 + crypto micropayments.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -X POST https://book402.com

/.well-known/x402.json