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x402 Protocol Brings HTTP-Native Micropayments to Autonomous AI Agents

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The x402 protocol proposes a standardized way for AI agents to make machine-to-machine payments using HTTP status code 402, which has been reserved but largely unused for decades. Traditional API billing models — relying on subscriptions, credit cards, or long-lived API keys — create significant inefficiencies for autonomous agents that must access dozens of services independently. x402 replaces pre-established billing relationships with an on-demand request-response payment handshake, enabled by low-latency Layer 2 blockchains and stablecoins. When an agent requests a paid endpoint, the server responds with payment details, the agent submits a on-chain transaction, and the server verifies the proof before granting access. The protocol includes safeguards such as block-age checks and transaction log parsing to prevent replay attacks and double-spending.

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x402 Protocol Brings HTTP-Native Micropayments to Autonomous AI Agents · ShortSingh