AI x Crypto Systems disclosure: this article was prepared with AI assistance as an editorial helper. The ideas, facts, code, sources, and conclusions were reviewed by a human.
AI x Crypto Systems disclosure: this article is a technical explanation, not investment advice. AI x Crypto Systems does not recommend buying, selling, or holding any cryptoasset.
x402 for AI APIs
x402 for AI APIs is easiest to understand by following the second HTTP request. The first request asks for a paid resource. The server answers with 402 Payment Required. The second request carries the payment material and becomes the packet that deserves review. If an AI agent is allowed to sign that second request, the system needs more than a happy-path demo. x402 for AI APIs needs policy, replay handling, privacy review, and output validation around the payment.
GET /v1/report/42 HTTP/1.1
