# Agentic commerce, explained: what ACP and UCP mean for your store

> AI assistants can now shop for people, and some can pay too. Two open standards shape how: the Agentic Commerce Protocol from OpenAI and Stripe, and Google's Universal Commerce Protocol. Here is what each one does as of 7 October 2026, what your store has to provide, and how to join through the platform you already use.

Updated October 7, 2026 · AI Syndicate team · https://www.aisyndicate.com/blog/agentic-commerce-acp-ucp/

**Quick answer:** Agentic commerce means an AI assistant finds products and, with the shopper's OK, checks out. **ACP** (OpenAI and Stripe) now mainly powers product discovery in ChatGPT, with purchases finishing on your site. **UCP** (Google and partners) powers a Buy button in AI Mode and Gemini. Most small stores join through **Shopify, Stripe, PayPal or Merchant Center**, not custom code.

**Our take:** Skip the protocol race; the feed every agent reads is the part you control. OpenAI has stepped back from checkout inside ChatGPT while Google, Microsoft and Shopify pushed theirs forward. The wiring keeps changing hands. What each program asks a small store for stays the same: a complete feed, published policies and a price that matches the page. We'd let the platform handle the connection and spend the hours on that data.

## What are the key facts about agentic commerce right now?

Checked on 7 October 2026. This area changes every few months, so the dates matter.

| Fact | Detail | Source |
| --- | --- | --- |
| ACP | Open standard from OpenAI and Stripe, released under the Apache 2.0 license | ACP |
| Buying inside ChatGPT | OpenAI says it is "moving away from a standalone Instant Checkout"; purchases finish on the store's site or app | OpenAI |
| ChatGPT fees | "There are no fees on purchases that start in ChatGPT" | OpenAI |
| Who is in ChatGPT shopping | Shopify and Etsy catalogs are already integrated; other stores apply and join a waitlist; live for U.S. users | OpenAI |
| UCP | Open standard Google launched on 11 Jan 2026, co-developed with Shopify, Etsy, Wayfair, Target and Walmart | Google |
| Google checkout | A Buy button in AI Mode and Gemini, paid with Google Pay; you stay the seller of record; select merchants only | Google Merchant Center Help |
| AP2 | Open protocol for agent payments, announced 16 Sep 2025; works as an extension of A2A and UCP | AP2 |
| Microsoft Copilot Checkout | English-language merchants selling to U.S. buyers in USD; Microsoft takes no commission today | Microsoft Advertising |

## What is agentic commerce?

Agentic commerce is shopping where an AI assistant does part of the shopper's work: finding products, comparing them and, with permission, paying. Google describes it as AI that "completes tasks on people's behalf." [Google](https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/)

A real example: in November 2025 Google began rolling out agentic checkout in the U.S. A shopper tracks a price, and when it drops into budget, Google can "buy it for you on the merchant's site using Google Pay." Google says it will "always ask for your permission first." [Google](https://blog.google/products-and-platforms/products/shopping/agentic-checkout-holiday-ai-shopping/)

An agent can buy from you in two ways:

1. **Through your website, like a person.** It clicks your buttons and fills in your checkout form. Our guide on [making your website work for AI agents](/blog/make-your-website-work-for-ai-agents/) covers this route.
2. **Through a direct connection to your store's systems.** The agent asks for price and stock, builds a cart and passes payment details in a fixed format.

That fixed format is called a **protocol**: an agreed set of messages, like a standard order form both sides can read. ACP and UCP are the two big ones for shopping.

## What is ACP, and can shoppers still buy inside ChatGPT?

ACP, the Agentic Commerce Protocol, is the open standard that connects ChatGPT to stores. As of 7 October 2026, OpenAI uses it mainly to help shoppers find products, and the purchase finishes on your own site.

Stripe and OpenAI built ACP together. It is open source under the Apache 2.0 license, and Stripe was the first payment provider to support it. [ACP](https://www.agenticcommerce.dev/) OpenAI's merchant page says ACP "supports product discovery and more accurate, personalized recommendations through shared product data," and that "over time, ACP will expand to support the full shopping journey." [OpenAI](https://chatgpt.com/merchants)

### What happened to Instant Checkout?

The same page answers it: "We're moving away from a standalone Instant Checkout experience in ChatGPT." Shoppers "discover and evaluate products in ChatGPT, but purchases are completed on merchant-owned websites or apps." [OpenAI](https://chatgpt.com/merchants) Shopify agrees, calling ChatGPT "a discovery-focused referrer platform." [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts)

> **OpenAI's pages don't all match yet.** Its help center still says ChatGPT "may also show an Instant Checkout option" for some products. [OpenAI](https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search) Its developer docs still explain how Instant Checkout works for "approved partners." [OpenAI](https://developers.openai.com/commerce/guides/key-concepts) Our advice: go by the merchant page, which is the one written for sellers, and plan for ChatGPT to send buyers to your site.

### What ACP checkout was designed to need

The docs still describe three parts: a **product feed**, **checkout endpoints** that ChatGPT calls to start an order you accept or decline, and **delegated payment**, a one-time payment request with "a maximum chargeable amount and expiry." [OpenAI](https://developers.openai.com/commerce/guides/key-concepts)

Today the feed is the part that counts, and feed onboarding is "currently available to approved partners." [OpenAI](https://developers.openai.com/commerce/guides/get-started)

## What is UCP, and how does checkout work in Google AI Mode and Gemini?

UCP, the Universal Commerce Protocol, is an open standard Google launched on 11 January 2026 that lets AI agents check out directly with a store, starting in AI Mode in Search and the Gemini app. [Google](https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/)

Google co-developed it with Shopify, Etsy, Wayfair, Target and Walmart, and more than 20 others endorsed it, including Mastercard, Stripe and Visa. [Google](https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/) Stores "remain the Merchant of Record." [UCP](https://ucp.dev/)

### What the shopper sees

A Buy button on eligible product listings. Shoppers pay with Google Pay, using the cards and shipping details already saved in Google Wallet. Google says "you will remain the seller of record." [Google Merchant Center Help](https://support.google.com/merchants/answer/16837055?hl=en)

Stores can pick one of two paths. The **native checkout path** handles the whole purchase on Google. The **cart path** hands the shopper's cart over to your website to finish. Either way, Google must approve your integration "before you can go live." [Google for Developers](https://developers.google.com/merchant/ucp/guides/overview)

### How fast it is moving

- **19 March 2026:** UCP added Cart, Catalog and Identity Linking, which gives signed-in shoppers their member prices. [Google](https://blog.google/products-and-platforms/products/shopping/ucp-updates/)
- **20 May 2026:** Google announced Universal Cart, a cart that works across stores. UCP checkout is to reach Canada and Australia "in the coming months, and later to the U.K." [Google](https://blog.google/products-and-platforms/products/shopping/shopping-updates-google-marketing-live/)
- **16 September 2026:** Google said UCP "already enables direct checkout for hundreds of thousands of brands and retailers." [Google](https://blog.google/products-and-platforms/products/shopping/google-shopping-updates-holiday-shopping/)

UCP is spreading beyond Google. Microsoft says its Merchant Center "will support Universal Commerce Protocol." It also gives a useful split: "Feeds primarily enable discovery," while "UCP enables transactions." [Microsoft Advertising](https://about.ads.microsoft.com/en/solutions/technology/agentic-commerce) Stripe lists both UCP and ACP for selling through agents. [Stripe](https://docs.stripe.com/agentic-commerce)

## What does my store have to provide before an AI agent can buy from it?

Three things: product data the agent can trust, a way to take the order, and a way to take the payment. Your platform or payment provider may handle the last two for you.

| Piece | What it means | ACP (ChatGPT) | UCP (Google) |
| --- | --- | --- | --- |
| Product feed | A file listing every product, price and stock level | CSV or JSON feed | Merchant Center feed, plus shipping and returns |
| Checkout connection | Your system's way to accept an order from an agent | Checkout endpoints | UCP profile and secured API endpoints |
| Payment token | A one-time stand-in for the shopper's card, with limits | Delegated payment, such as Stripe's token | Google Pay, via a Google Pay & Wallet Console account |

Sources: [OpenAI](https://developers.openai.com/commerce/guides/key-concepts), [Google for Developers](https://developers.google.com/merchant/ucp/guides/overview), [Google Merchant Center Help](https://support.google.com/merchants/answer/16837055?hl=en).

### How payment tokens keep the card safe

The agent never hands you the shopper's raw card. Stripe calls its shared payment token "a scoped grant to use the customer's payment method," with "usage and expiration limits." The agent sets the maximum amount to match the order total. [Stripe](https://docs.stripe.com/agentic-commerce/concepts/shared-payment-tokens)

**AP2, the Agent Payments Protocol,** adds proof of what the shopper agreed to, using signed records called mandates for the cart and the payment. Google announced it on 16 September 2025, and FIDO Alliance working groups now carry the standard forward. [AP2](https://ap2-protocol.org/) [Google](https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/) UCP and AP2 are built to work together. [Google Merchant Center Help](https://support.google.com/merchants/answer/16837055?hl=en)

## Who can join agentic checkout today, and how do I apply?

Most programs are open to small stores, but many are U.S.-only and some are still invite-based. Here is where each stood on 7 October 2026.

| Program | Who can join | How to start | Source |
| --- | --- | --- | --- |
| ChatGPT shopping (ACP feeds) | Shopify and Etsy stores automatically; others apply and wait; U.S. shoppers | Apply at chatgpt.com/merchants | OpenAI |
| Google UCP checkout | Select merchants; products eligible in the U.S., Canada and Australia | Build to Google's UCP guide, then send the interest form | Google Merchant Center Help |
| Shopify agentic storefronts | On by default for eligible Shopify stores | Shopify admin: Sales channels > Agentic | Shopify Help Center |
| Microsoft Copilot Checkout | English-language merchants selling to U.S. buyers in USD; Merchant Center account required | Through Shopify, Stripe or PayPal | Microsoft Advertising |
| Stripe Agentic Commerce Suite | Stripe sellers in the U.S., Canada and select European countries | Stripe Dashboard: Agentic commerce | Stripe |
| PayPal Store Sync and Agent Ready | PayPal merchants; reaches Copilot and Perplexity | Sales form at paypal.ai | PayPal |

Sources: [OpenAI](https://chatgpt.com/merchants), [Google Merchant Center Help](https://support.google.com/merchants/answer/16992327?hl=en), [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts), [Microsoft Advertising](https://about.ads.microsoft.com/en/solutions/technology/agentic-commerce), [Stripe](https://docs.stripe.com/agentic-commerce/sellers/use-cases/retail), [PayPal](https://www.paypal.ai/).

OpenAI says a self-serve merchant platform is coming "later this year." [OpenAI](https://chatgpt.com/merchants) Google is rolling out a UCP integration hub inside Merchant Center in the U.S., "with Australia and Canada to follow next year." [Google Merchant Center Help](https://support.google.com/merchants/answer/16992327?hl=en)

Perplexity's in-chat checkout launched with PayPal. On 25 November 2025, PayPal said its merchants had become discoverable in Perplexity, with U.S. users able to check out in the chat. [PayPal](https://newsroom.paypal-corp.com/2025-11-PayPal-and-Perplexity-Launch-Instant-Buy)

ChatGPT also bars some products outright, such as alcohol, nicotine, weapons and prescription-only medicines. [OpenAI](https://developers.openai.com/commerce/guides/get-started)

## What should I do if my store runs on Shopify, WooCommerce or another platform?

Start in your platform's settings. Most small stores will join through their platform or payment provider, not by building ACP or UCP themselves. Google says so directly: if you use a platform, "connect directly with them" about their UCP plans. [Google Merchant Center Help](https://support.google.com/merchants/answer/16992327?hl=en)

### Shopify

Agentic storefronts are "active by default for eligible stores." You manage them in **Sales channels > Agentic**, where the default setting, "Allow Shopify to manage for me," also signs you up for new AI channels automatically. [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/agentic-home)

For direct checkout in Google AI Mode and Gemini, Shopify lists these rules [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/google):

- Your store is based in the U.S. and sells to U.S. customers.
- Your products are in Google Merchant Center, for example through the Google & YouTube channel with product and shipping sync turned on.
- Subscriptions, bundles, customizable products and B2B-only products aren't supported, and neither are local delivery or pickup.
- Google Analytics and custom pixels won't fire in that checkout.
- There are "no fees" beyond your normal payment processing.

Not on Shopify? Its Agentic plan, announced 11 January 2026, lets brands list products in Shopify Catalog "without needing to have a Shopify online store." [Shopify](https://www.shopify.com/news/ai-commerce-at-scale)

### WooCommerce

WooCommerce's own status table lists UCP and ACP as "Coming soon" and MCP, a standard way for AI assistants to read your store, as live. Its advice is to install **Google for WooCommerce**, which syncs your catalog to Merchant Center, and **Stripe for WooCommerce**, which will add agentic checkout through Stripe. [WooCommerce](https://woocommerce.com/agentic-commerce/)

### Any other platform

Use the payment provider you already have: Stripe's suite [Stripe](https://docs.stripe.com/agentic-commerce/sellers/use-cases/retail) or PayPal's Store Sync. [PayPal](https://www.paypal.ai/) Also set up Google Merchant Center and apply for ChatGPT feeds. Our guide on [getting products into AI shopping](/blog/how-to-get-products-into-ai-shopping/) walks through each feed.

## What stays the same when AI agents do the buying?

Almost everything that makes a store good for people: accurate product data, current prices and stock, honest reviews and clear policies. The agent still has to choose you before it can buy.

**Agents still rank products.** OpenAI ranks merchants on "availability, price, quality, and whether they are the maker or primary seller." [OpenAI](https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search) Shopify's listing checks score description detail, image count, verified reviews, complete variants and store policies. [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/agentic-home)

**Wrong prices now break sales, not just trust.** Stripe warns that price mismatches "cause checkouts to fail." It suggests sending stock and price updates about every 15 minutes, since an agent may keep calling an item sold out until it hears otherwise. [Stripe](https://docs.stripe.com/agentic-commerce/sellers/use-cases/retail)

**Policies are entry tickets.** Google needs shipping and returns in Merchant Center. Shopify needs your terms, privacy and refund policies before Google checkout. Stripe asks for terms, privacy and returns when you sign up. [Google for Developers](https://developers.google.com/merchant/ucp/guides/overview) [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/google) [Stripe](https://docs.stripe.com/agentic-commerce/sellers/use-cases/retail)

Our guide on [showing prices to AI](/blog/should-you-show-prices-to-ai/) covers the price side.

Our advice: the protocols differ by company, but they all read the same inputs. Clean data serves ChatGPT, Gemini, Copilot, Perplexity and the next agent too.

## What should be on a small store's agentic commerce checklist?

| Check | Done when | Source |
| --- | --- | --- |
| Platform settings | You've opened your platform's AI channel settings (Shopify: Sales channels > Agentic) | Shopify Help Center |
| Google Merchant Center | Your feed syncs and shipping and returns are set | Google for Developers |
| ChatGPT | You're on Shopify or Etsy, or you've applied for a direct feed | OpenAI |
| Microsoft Merchant Center | Your feed is live; U.S. sellers can ask their payment provider about Copilot Checkout | Microsoft Advertising |
| Store policies | Returns, refunds, terms and privacy pages are published and match your feeds | Shopify Help Center |
| Fresh prices and stock | Updates go out when they change, not once a week | Stripe |
| Product limits | You know which items can't use agent checkout, such as subscriptions or bundles on Shopify's Google checkout | Shopify Help Center |
| Order tracking | You check your platform's AI channel reports, since browser pixels may not fire | Shopify Help Center |
| Dates | You recheck each program page every quarter | Our advice |

To see whether AI assistants already recommend your products, ask them what your shoppers ask. Our [Prompt Simulator](/prompt-simulator/) runs one question across many AI engines at once and shows the sources each one used.

## FAQ

### Do I need to build ACP or UCP myself?

Usually not. Shopify runs agentic storefronts for eligible stores by default, and Stripe and PayPal offer one connection that reaches several AI agents. Google tells platform users to ask their platform about UCP plans. [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts) [Stripe](https://docs.stripe.com/agentic-commerce/sellers/use-cases/retail) [Google Merchant Center Help](https://support.google.com/merchants/answer/16992327?hl=en)

### Can shoppers buy my products inside ChatGPT?

Mostly not, as of 7 October 2026. OpenAI says it is moving away from standalone Instant Checkout, and purchases are completed on merchant-owned websites or apps. [OpenAI](https://chatgpt.com/merchants)

### Is Google's AI Mode checkout open to small stores?

It is open to select merchants for products eligible in the U.S., Canada and Australia. You build to Google's UCP guide, send an interest form, and get approved. U.S.-based Shopify stores can join through Shopify as it rolls out. [Google Merchant Center Help](https://support.google.com/merchants/answer/16992327?hl=en) [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/google)

### Who handles refunds when an AI agent places the order?

You do. The store stays the merchant of record, meaning the business legally selling the item, in ChatGPT, Google, Microsoft Copilot and PayPal-powered Perplexity checkouts. [OpenAI](https://developers.openai.com/commerce/guides/key-concepts) [Google Merchant Center Help](https://support.google.com/merchants/answer/16837055?hl=en) [Microsoft Advertising](https://about.ads.microsoft.com/en/solutions/technology/agentic-commerce) [PayPal](https://newsroom.paypal-corp.com/2025-11-PayPal-and-Perplexity-Launch-Instant-Buy)

### Does agentic checkout cost extra fees?

Not from these programs, as of 7 October 2026. OpenAI charges no fees on purchases that start in ChatGPT. Shopify charges nothing extra for Google AI Mode and Gemini checkout beyond payment processing. Microsoft takes no commission on Copilot Checkout. [OpenAI](https://chatgpt.com/merchants) [Shopify Help Center](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/google) [Microsoft Advertising](https://about.ads.microsoft.com/en/solutions/technology/agentic-commerce)

## Sources

1. [Power product discovery in ChatGPT](https://chatgpt.com/merchants) — OpenAI. Read Oct 7, 2026.
2. [Key concepts – Agentic Commerce](https://developers.openai.com/commerce/guides/key-concepts) — OpenAI. Read Oct 7, 2026.
3. [Get Started – Agentic Commerce](https://developers.openai.com/commerce/guides/get-started) — OpenAI. Read Oct 7, 2026.
4. [Shopping with ChatGPT Search](https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search) — OpenAI. Read Oct 7, 2026.
5. [Agentic Commerce Protocol](https://www.agenticcommerce.dev/) — Agentic Commerce Protocol (OpenAI and Stripe). Read Oct 7, 2026.
6. [Agentic commerce](https://docs.stripe.com/agentic-commerce) — Stripe. Read Oct 7, 2026.
7. [Sell through agents](https://docs.stripe.com/agentic-commerce/sellers/use-cases/retail) — Stripe. Read Oct 7, 2026.
8. [Shared payment tokens](https://docs.stripe.com/agentic-commerce/concepts/shared-payment-tokens) — Stripe. Read Oct 7, 2026.
9. [New tech and tools for retailers to succeed in an agentic shopping era](https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/) — Google. Read Oct 7, 2026.
10. [AI shopping gets simpler with Universal Commerce Protocol updates](https://blog.google/products-and-platforms/products/shopping/ucp-updates/) — Google. Read Oct 7, 2026.
11. [How we're helping retailers thrive with new Universal Commerce Protocol features and AI tools on Google](https://blog.google/products-and-platforms/products/shopping/shopping-updates-google-marketing-live/) — Google. Read Oct 7, 2026.
12. [Boost your holiday sales with these agentic commerce updates](https://blog.google/products-and-platforms/products/shopping/google-shopping-updates-holiday-shopping/) — Google. Read Oct 7, 2026.
13. [Let AI do the hard parts of your holiday shopping](https://blog.google/products-and-platforms/products/shopping/agentic-checkout-holiday-ai-shopping/) — Google. Read Oct 7, 2026.
14. [About the Universal Commerce Protocol (UCP) and UCP-powered checkout feature on Google](https://support.google.com/merchants/answer/16837055?hl=en) — Google Merchant Center Help. Read Oct 7, 2026.
15. [How to onboard to the UCP integration hub in Merchant Center](https://support.google.com/merchants/answer/16992327?hl=en) — Google Merchant Center Help. Read Oct 7, 2026.
16. [Google Universal Commerce Protocol (UCP) Guide: Overview](https://developers.google.com/merchant/ucp/guides/overview) — Google for Developers. Read Oct 7, 2026.
17. [Universal Commerce Protocol](https://ucp.dev/) — Universal Commerce Protocol. Read Oct 7, 2026.
18. [Agent Payments Protocol (AP2)](https://ap2-protocol.org/) — AP2. Read Oct 7, 2026.
19. [The agentic commerce platform: Shopify connects any merchant to every AI conversation](https://www.shopify.com/news/ai-commerce-at-scale) — Shopify. Read Oct 7, 2026.
20. [Shopify agentic storefronts](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts) — Shopify Help Center. Read Oct 7, 2026.
21. [Managing agentic storefronts](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/agentic-home) — Shopify Help Center. Read Oct 7, 2026.
22. [Selling on Google AI Mode and Gemini](https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/google) — Shopify Help Center. Read Oct 7, 2026.
23. [Make your store visible to AI agents](https://woocommerce.com/agentic-commerce/) — WooCommerce. Read Oct 7, 2026.
24. [PayPal Agentic Commerce Services](https://www.paypal.ai/) — PayPal. Read Oct 7, 2026.
25. [PayPal and Perplexity Launch Instant Buy Ahead of Black Friday](https://newsroom.paypal-corp.com/2025-11-PayPal-and-Perplexity-Launch-Instant-Buy) — PayPal. Read Oct 7, 2026.
26. [Agentic Commerce](https://about.ads.microsoft.com/en/solutions/technology/agentic-commerce) — Microsoft Advertising. Read Oct 7, 2026.