TL;DR
- Google is rolling out holiday agentic-commerce updates on the Universal Commerce Protocol, led by cart transfer, which lets shoppers move items from Google to a merchant's own site to check out, reported by Search Engine Journal on 16 September 2026.
- Cart transfer answers retailers' complaint that checkout-on-Google loses the customer relationship; it is US-only now, with Australia and Canada early next year.
- A UCP analytics dashboard measures the checkout funnel from Buy-button click to purchase, while AI performance insights reports share of voice in organic AI traffic with still no click metric.
- Business Agent is opening a US beta inside YouTube ads, embedding a branded agent so viewers browse and ask questions without leaving YouTube.
- Thailand is not in any rollout list; India's inclusion in AI performance insights is the signal that APAC is on the roadmap, so Thai merchants should prepare a clean feed and strong own-site checkout.
Google is rolling out a set of agentic commerce updates for the holiday season, led by a cart transfer option that lets shoppers move items from Google to a merchant's own site to finish buying. Search Engine Journal reported the changes on 16 September 2026, drawn from a holiday shopping post by Ashish Gupta, Google's VP and GM of Merchant Shopping. The update also adds a UCP analytics dashboard, opens a US beta of Business Agent inside YouTube ads, and takes the AI performance insights report to five countries.
All of it runs on the Universal Commerce Protocol, or UCP, which Google says already enables direct checkout for hundreds of thousands of brands and retailers across its surfaces. The through-line is that Google is building out both the buying flow and the measurement around commerce that happens on Google itself, and giving merchants a way to pull the transaction back to their own site when they want it.
What changed
| Update | What it does | Where |
|---|---|---|
| Cart transfer | Shoppers move items from Google to the merchant's own site to complete the purchase. | US now, Australia and Canada early next year. |
| UCP analytics dashboard | Measures the checkout funnel from Buy-button click to purchase, plus average order value and cancellations. | Merchant Center, for merchants with UCP and the Performance role. |
| Business Agent on YouTube ads | A branded agent embedded in YouTube ads so viewers browse products and ask questions without leaving YouTube. | US beta, retailers invited. |
| AI performance insights | Reports share of voice, frequency, and which products show in organic AI traffic. | Australia, Canada, India, New Zealand, US. |
Cart transfer, and why retailers wanted it
The cart transfer option is the answer to a complaint retailers made when checkout-on-Google first appeared. As Search Engine Journal reported, retailers said that when the transaction happens entirely on Google, customers never visit the store, never see accessory suggestions or related products, and feel less connected to the brand. Cart transfer is Google's response: the shopper builds a cart on Google, then moves to the merchant's own checkout with that cart already populated.
Technically, Google's developer docs list this as a capability called Transfer to merchant cart, which a merchant enables by supporting the Cart API. The docs include a checklist for this option that skips full product feed setup, product warnings, and customer support details, and there is a sandbox in the same tab for testing the cart and checkout requests Google might send. The capability itself is not brand new, Google described it as a draft in March and mentioned it at Google Marketing Live in May, but it is now something merchants with hub access can turn on as part of Merchant Center validation.
To use the hub, a merchant completes the technical setup, submits an interest form, and waits to be selected. The hub is being introduced gradually across the US, with Australia and Canada next in line early next year.
Two analytics layers, measuring different things
The measurement side is where merchants should pay attention, because Google is now offering two different commerce reports that answer different questions, and confusing them wastes the data.
The UCP analytics dashboard, described in developer docs last updated 3 September, covers the checkout funnel: it starts at the click on the Buy button and counts through to purchase, with metrics like average order value and cancellations, plus account linking information and top-selling UCP products. It is available to merchants with UCP enabled and the Performance role, and Google notes the data is not accessible through the Merchant API yet.
The AI performance insights report measures earlier in the journey. It reports share of voice, frequency, and which products are showing in organic AI traffic, guiding merchants on which product attributes to include. Crucially, it still carries no click metric and covers organic AI traffic only, so it does not tell a merchant whether AI Mode actually sent anyone to their site. That limitation was true in the July pilot and, as Search Engine Journal notes, has not changed. So one report tells you whether your products surface in AI answers, and the other tells you what happens once someone clicks Buy, and neither bridges the gap between an AI appearance and a session on your site.
Business Agent moves into YouTube
Business Agent, which went live in Search on 12 January with UCP, is now opening a US beta inside YouTube ads. A qualifying retailer gets a branded agent embedded in its YouTube ads, so viewers can browse products and ask questions without leaving YouTube. Google did not specify the qualification criteria or how long the beta will last.
The direction is worth noting even while the beta is small. An agent embedded in a video ad turns a YouTube placement from an awareness unit into an interactive shopping surface, where the browsing and the questions happen inside the ad. For retailers, that is a different kind of YouTube presence from a skippable brand spot, and it is the clearest sign yet that Google wants the whole commerce loop, discovery, questions, and buying, to be possible without a click to the open web.
Where Thailand stands
The honest answer for Thai merchants is that none of this is live in Thailand yet, and that is the most useful thing to know. Cart transfer is US-only now, with Australia and Canada early next year. AI performance insights is open in Australia, Canada, India, New Zealand, and the US, in English-language queries only. Business Agent on YouTube is a US beta. Thailand is not named in any of these lists.
India's inclusion in the AI performance insights list is the signal worth watching, because it is the first of these commerce-measurement tools to reach a major APAC market, which suggests the region is on the roadmap rather than off it. The English-language-only limitation is the second thing to note: even when these tools reach Thailand, a Thai-language storefront may sit behind the English coverage, as it does with several Google AI features. The practical stance is preparation, not action. The product data quality that AI performance insights rewards, complete and accurate attributes, is worth getting right now, because it is the same data that feeds Shopping and organic surfaces already, and it is what these tools will read when they do arrive.
For Thai e-commerce teams, that means treating this as a roadmap preview: keep the product feed clean, keep the site's own checkout fast and complete so a cart transfer would land somewhere good, and build the measurement habit on the tools you do have. Our e-commerce marketing team can help align a feed and a store for these surfaces, and the AI-visibility side connects to the same generative engine optimisation work that decides whether your products surface in AI answers at all.
What Google did not say
Several operational questions are open. Google did not give a Thailand or wider APAC date for cart transfer, the hub, or Business Agent beyond India's inclusion in one report. It did not publish the qualification criteria or duration for the YouTube Business Agent beta. It did not say when the UCP analytics dashboard becomes available through the Merchant API, only that it is not yet. And it did not close the measurement gap that the AI performance insights report still leaves: no click metric, organic AI traffic only, so whether AI surfaces drive sessions and revenue remains unmeasured on Google's own tools.
Frequently asked questions
What is Google's cart transfer feature?
It is an option in the Merchant Center hub for the Universal Commerce Protocol that lets shoppers move items from Google to a merchant's own site to complete the purchase, with the cart already populated. Merchants enable it by supporting the Cart API, and it is rolling out in the US now, with Australia and Canada early next year.
Why would a retailer want the transaction off Google?
Retailers told Google that when checkout happens entirely on Google, customers never visit the store, never see accessory or related-product suggestions, and feel less connected to the brand. Cart transfer lets the shopper finish on the merchant's own checkout, keeping that relationship, while still starting on Google.
What is the difference between UCP analytics and AI performance insights?
UCP analytics measures the checkout funnel, from the Buy-button click to purchase, with average order value and cancellations. AI performance insights measures earlier, reporting share of voice, frequency, and which products show in organic AI traffic. Neither connects an AI appearance to a session on your site, because AI performance insights still has no click metric.
Is any of this available in Thailand?
No. Cart transfer is US-only now with Australia and Canada early next year, Business Agent on YouTube is a US beta, and AI performance insights covers Australia, Canada, India, New Zealand, and the US in English-language queries only. Thailand is not named in any of the rollout lists.
What should a Thai merchant do now?
Prepare rather than act. Keep the product feed complete and accurate, since that is the data these tools read and it already feeds Shopping and organic surfaces, and keep your own checkout fast and complete so a future cart transfer lands well. India's inclusion suggests APAC is on the roadmap, so the groundwork is worth laying now.
The bottom line
Google is building the full commerce loop on its own surfaces, discovery, questions in a YouTube ad, checkout, and the analytics around it, while offering merchants a cart transfer path back to their own site to keep the customer relationship. For US and, soon, Australian and Canadian retailers, the practical work starts now. For Thai merchants, none of it is live yet, but India's appearance in the measurement rollout says APAC is coming, and the preparation, a clean feed and a strong own-site checkout, is the same work that pays off on the surfaces you already sell on.
