x402

Open protocol that revives HTTP 402 so an API can charge small per-request payments from agents.

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Information is summarised in our own words and may be out of date; check the vendor's site for current terms and prices. Not affiliated with x402. Suggest a correction.

Category	Agent Payments
Authentication	No auth
Pricing	Free
Website	https://www.x402.org/
Docs	https://github.com/coinbase/x402#readme
Last checked	2026-10-14
As JSON	/api/v1/directory/x402.json