What merchants must know to accept payments from AI agents safely

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As AI agents increasingly make autonomous purchases of digital goods and API access, traditional checkout flows built for human users are fundamentally incompatible with programmatic buyers. The x402 protocol addresses this by using HTTP's long-unused 402 Payment Required status code, allowing agents to settle stablecoin payments on-chain without browser sessions or redirects. However, x402 alone does not resolve merchant liability, since verifying whether an agent was actually authorized to spend funds remains a critical challenge. Agentic payment systems rely on cryptographically signed "mandates" — scoped authorizations issued by a human or operator principal — which merchants must validate for authenticity, currency, and transaction scope. Experts recommend local, offline mandate verification to avoid latency and resilience issues tied to third-party verification services.

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