Agentic Commerce Protocol (ACP)
Open protocol (OpenAI and Stripe) by which a merchant exposes a product feed and an agentic checkout API so any compatible agent can discover products and securely initiate checkout with a delegated payment.
Description
ACP is an open specification from OpenAI and Stripe behind Instant Checkout in ChatGPT (live since September 2025). Merchants publish structured catalog data that an agent can ingest and configure an agentic checkout endpoint so any compatible agent can initiate a purchase; the buyer authorises spend inside the agent and a scoped payment token is passed to the merchant rather than raw card details.
Solution
Commerce protocol. Step 1: the merchant publishes structured catalog data (a product feed) and stands up an agentic checkout endpoint. Step 2: an agent ingests the feed, reasons over inventory, and surfaces products to the user. Step 3: the agent constructs a cart by calling the checkout API. Step 4: the buyer authorises spend inside the agent and a scoped payment token is passed to the merchant, who completes the order.
Primary use cases
- Instant Checkout for products surfaced inside ChatGPT
- merchants exposing machine-readable catalogs and an agent checkout API
- delegated, scoped agent payment without sharing card details
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