Glossary
Agentic Commerce Protocol (ACP)
The Agentic Commerce Protocol (ACP) is OpenAI and Stripe's specification for AI-agent shopping in ChatGPT. It has three parts: a product feed merchants push, an agentic-checkout API, and a delegated-payment flow built on Stripe's Shared Payment Token.
ChatGPT shopping uses a merchant-push feed — products are submitted to a secure endpoint, not crawled from the web. Shopify stores are auto-enrolled; everyone else applies at chatgpt.com/merchants and builds a feed plus checkout endpoints.
In March 2026 OpenAI pivoted away from in-chat Instant Checkout toward an apps model that hands off to the merchant's storefront to close the sale — a signal that agentic checkout at scale is harder than the launch implied. Discovery in ChatGPT continues regardless, and it reads the same structured product data every other surface does.