x402 Protocol Lets AI Agents Pay for Web APIs Using Micro-Settlements on Base

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Autonomous AI agents struggle to pay for paid APIs because they cannot hold conventional bank accounts, and card processing minimums make tiny per-request charges uneconomical. The x402 protocol addresses this by reviving the long-dormant HTTP 402 Payment Required status code and pairing it with USDC settlement on the Base Layer 2 network, EIP-712 signatures, and HTTP headers. In the flow, a server responds to an agent's request with a 402 challenge specifying the price and payment details, and the agent pays on-chain and retries with a payment proof attached. The article includes a minimal Python client example and argues that subscription-based SaaS models suit human usage poorly compared with bursty agent workloads that require no account provisioning or card details.

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