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AI agent's USDC payment might stay valid for a week. Here's how to check before it signs

When an AI agent pays for an API with x402 , it doesn't send a transaction. It signs a message that says "move 0.01 USDC from me to you, valid between time A and time B." Someone else submits that message on-chain later. That signature is the payment. If its valid window is wide open, the payment i…

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  1. 2026-10-31 19:52 · DEV Community — AI
    AI agent's USDC payment might stay valid for a week. Here's how to check before it signs

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