Answer-first definitionUpdated 15 Aug 2026

Agentic Commerce · AR-COMM-01..05

Protocols for an agent to pay or checkout on behalf of the user: x402/MPP (402 Payment Required), ACP (OpenAI+Stripe) and UCP (Google+Shopify). MAY, one suffices for conformance.

Context

Commerce is the only section where implementing one alternative suffices. ACP Delegate Payment allows a cart-scoped payment token.

Why it matters for agent readiness

AR-COMM-01..05 MAY — one suffices for conformance. x402/MPP use 402 Payment Required to charge per API call; ACP (OpenAI+Stripe) and UCP (Google+Shopify, /.well-known/ucp) orchestrate delegated checkout with cart-scoped tokens.

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Doubts about this term? miguel@belmon.tech · Back to glossary