In one sentence: Instant Checkout lets a user buy a product without leaving ChatGPT. Under the hood it is the Agentic Commerce Protocol (ACP), an open standard from OpenAI and Stripe, that hands the order to your store while you stay seller of record.
What OpenAI launched on September 29, 2025
More than 700 million people use ChatGPT every week, and many look for products there. Instant Checkout adds the next step: going from research to purchase in the same conversation. The feature is powered by the Agentic Commerce Protocol, which OpenAI co-developed with Stripe and partner merchants, and open-sourced so others can implement it.
Who can buy, and where
At launch, ChatGPT users in the United States (Free, Plus and Pro) can buy from US Etsy sellers. OpenAI announced more than a million Shopify merchants coming next, citing brands like Glossier, SKIMS, Spanx and Vuori. Purchases are limited to a single item at launch; multi-item carts, more merchants and new regions are announced for later.
How Instant Checkout works
When a user asks a shopping question (say, the best running shoes under 100 dollars), ChatGPT surfaces the most relevant products from across the web. Those results are organic and unsponsored, ranked purely on relevance. If a product supports Instant Checkout, the user can tap Buy, confirm order, shipping and payment, and complete the purchase without leaving the chat, using a card on file or another payment method.
Orders, payments and fulfillment are handled by the merchant with its existing systems. ChatGPT only acts as the user's agent, passing information between buyer and merchant the way a personal shopper would. Merchants pay a small fee on completed purchases; the service is free for users, does not affect prices, and does not influence product ranking. Enabling Instant Checkout does not promote a product: ranking considers availability, price, quality, whether a merchant is the primary seller, and whether Instant Checkout is enabled.
The Agentic Commerce Protocol, under the hood
ACP provides the shared language that lets an AI agent and a store complete a purchase for a user. It is designed to work across platforms, payment processors and business types, to integrate without changing the backend, and to keep the merchant as seller of record across the journey (payment, shipping, returns, support).
On payments: a merchant already on Stripe can enable agentic payments in as little as one line of code. A merchant on another processor can still take part through Stripe's new Shared Payment Token API or by adopting the Delegated Payments Spec in ACP, without switching processors. Trust is scoped: the user confirms each step, encrypted payment tokens are authorized only for a specific amount and merchant, and only the information needed for the order is shared.
How to make your store eligible
OpenAI makes the documentation and the protocol available to merchants and developers. In practice: expose a clean, structured catalog (the prerequisite for showing up in results), check your payment setup (Stripe makes activation simple), then apply through OpenAI's merchant program. Official documentation lives at developers.openai.com/commerce and the protocol at agenticcommerce.dev.
Instant Checkout, ACP, UCP: how to place them
Instant Checkout is the buying experience; ACP is the protocol that powers it inside ChatGPT; UCP is the equivalent backed by Google for AI Mode and Gemini. ACP and UCP are two standards on the same commerce layer, across two ecosystems. For a merchant, the right read is not to pick one over the other, but to make the catalog usable by both.
Frequently asked questions
Does Instant Checkout influence product ranking?
No. Results are organic and unsponsored. Enabling Instant Checkout does not promote a product; ranking rests on relevance, availability, price, quality and primary-seller status.
Do you have to be on Shopify or Etsy?
Those are the first integrations, but ACP is designed to work across platforms and processors. A merchant on another processor can take part through Stripe's Shared Payment Token API or the Delegated Payments Spec.
Who handles payment and returns?
The merchant, with its existing systems. It stays seller of record for payment, shipping, returns and support.
Sources
- OpenAI, "Buy it in ChatGPT: Instant Checkout and the Agentic Commerce Protocol" (September 29, 2025)
- Stripe, "Stripe powers Instant Checkout in ChatGPT and releases the Agentic Commerce Protocol"
- OpenAI, Agentic Commerce documentation
- Agentic Commerce Protocol (open-source specification)