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Agentic Commerce Protocol (ACP)
Open standard co-developed by Stripe and OpenAI (Apache-2.0, September 2025) for completing a purchase against a merchant that stays the merchant of record. The merchant exposes agent-facing REST or MCP endpoints (create, update, complete, and cancel checkout) over a product feed; the agent pays with a Stripe-issued Shared Payment Token scoped to a single merchant and cart total, so the agent never sees the buyer's card credentials. It launched as the standard behind ChatGPT Instant Checkout with Etsy sellers and Shopify merchants. Distinct from `model-context-protocol`: MCP is a general tool-calling transport, whereas ACP is a specific checkout contract that can ride over MCP or plain REST.
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Agentic Commerce Protocol (ACP)
Open standard co-developed by Stripe and OpenAI (Apache-2.0, September 2025) for completing a purchase against a merchant that stays the merchant of record. The merchant exposes agent-facing REST or MCP endpoints (create, update, complete, and cancel checkout) over a product feed; the agent pays with a Stripe-issued Shared Payment Token scoped to a single merchant and cart total, so the agent never sees the buyer's card credentials. It launched as the standard behind ChatGPT Instant Checkout with Etsy sellers and Shopify merchants. Distinct from `model-context-protocol`: MCP is a general tool-calling transport, whereas ACP is a specific checkout contract that can ride over MCP or plain REST.
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