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x402

x402 is an open payment protocol that uses the HTTP 402 status code to enable instant stablecoin payments on the web.

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x402 is an open payment protocol released by Coinbase in 2025. It builds on 402, the HTTP status code reserved for 'Payment Required': a server can ask for payment in response to a request, and once the client sends a stablecoin payment such as USDC, it receives the response right away.

Because it handles small payments without account sign-ups or card details, it is discussed as a way for AI agents to buy and sell paid resources such as APIs and data on their own.

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…gents create and manage their own wallets, and it points to open standards such as x402 for instant, low-cost payments between agents with no human in the loop.

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