What is Agentic Commerce Protocol (ACP)?

Definition & overview

Agentic Commerce Protocol is an open specification developed by OpenAI and Stripe for interactions between AI agents and merchants during checkout. It standardises commerce-related exchanges; it is not a general permission for agents to spend money independently.

Analogy & mental model

It is a shared checkout form that an assistant and a shop can both understand.

Check merchant support, payment permissions and order approval before considering an agent-assisted purchase flow.

Why Agentic Commerce Protocol (ACP) matters

Checkout is more consequential than recommending a product: it creates an order and may transfer money. ACP provides a shared transactional interface between an agent and a merchant. For a business, the priorities are reliable price and stock data, buyer consent and merchant-controlled fulfilment, not a claim that AI can negotiate or purchase anything automatically.

Practical business example

A buyer asks an assistant to purchase a selected item from a supported store. The store supplies the total and terms, the buyer authorises the purchase, and the merchant handles fulfilment. This is an illustrative flow, not a claim that every store supports ACP.

Illustrative scenario, not a client case study or promised result.

How Agentic Commerce Protocol (ACP) works

1. The agent uses a supported merchant checkout interface to create or update a checkout session with selected items.
2. The merchant returns authoritative totals, availability and information required to complete the order.
3. The buyer’s authorised payment and confirmation flow completes the session; the merchant remains responsible for the order and fulfilment.

Core components & mechanisms

• Checkout sessions and line items
• Merchant-provided totals and order state
• Authorised payment exchange

Implementation and availability evolve. ACP does not grant unlimited spending authority or guarantee inclusion in an assistant’s recommendations.

Agentic Commerce Protocol (ACP) vs Schema markup

Schema markup describes products and other page content. ACP defines transactional exchanges for checkout; adding Product schema does not create an ACP checkout integration. MCP connects tools, while A2A connects agent systems.

Frequently asked questions

What does Agentic Commerce Protocol (ACP) mean?

Agentic Commerce Protocol is an open specification developed by OpenAI and Stripe for interactions between AI agents and merchants during checkout. It standardises commerce-related exchanges; it is not a general permission for agents to spend money independently.

How is it different from Schema markup?

Schema markup describes products and other page content. ACP defines transactional exchanges for checkout; adding Product schema does not create an ACP checkout integration. MCP connects tools, while A2A connects agent systems.

What is a sensible first step for a small business?

Check merchant support, payment permissions and order approval before considering an agent-assisted purchase flow. The agent uses a supported merchant checkout interface to create or update a checkout session with selected items.

What limitations should I keep in mind?

Implementation and availability evolve. ACP does not grant unlimited spending authority or guarantee inclusion in an assistant’s recommendations.

Sources & further reading

Original Mushbloom explanation and illustrative examples. References support the underlying topic, not every business recommendation. Check current documentation before implementation.

Turn the concept into a practical decision

Discuss your website or business workflow before choosing tools or implementation. Start with the problem, approved information and appropriate human oversight.

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