x402 Protocol Enables HTTP-Native Micropayments for Stateless AI Agents

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The x402 proposal extends the HTTP 402 Payment Required status to allow AI agents to pay for services directly within HTTP headers, eliminating the need for API keys or billing cycles. When a server requires payment, it responds with a 402 status and a Pay header specifying the token, network, and amount; the client then retries with a signed payment proof attached. The system uses USDC on the Base blockchain and ECDSA cryptographic signatures to verify payments and prevent replay attacks, with no custom SDK or new transport protocol required. A senior engineer who tested the protocol notes it adds roughly 50–150 milliseconds of latency per paid request due to an extra round-trip and signature verification. While the draft specification is considered stable and already in use on some testnets and production services, it has not yet achieved universal adoption and requires server-side implementation of the full 402 payment flow.

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x402 Protocol Enables AI Agents to Make Autonomous Micropayments via HTTP

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