x402 Protocol Aims to Let AI Agents Pay for API Calls Autonomously

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As AI agents grow more autonomous, the current model of human-managed billing for API calls, compute, and data access is becoming impractical. The x402 protocol addresses this by reviving the long-reserved HTTP 402 status code, enabling servers to request payment before serving a response and allowing AI agents to pay automatically in milliseconds. For the protocol to work, agents require wallets they can operate independently within owner-defined policy limits. WAIaaS, an open-source self-hosted Wallet-as-a-Service, implements x402 support directly in its SDK, letting agents handle payments via a simple fetch-style call without any human involvement. The project positions autonomous machine-to-machine payments as a foundational requirement for the next generation of AI agent infrastructure.

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