Google Brings UCP Checkout to YouTube Shopping Ads

Google has extended its Universal Commerce Protocol checkout into ad campaigns for the first time, putting in-ad purchase inside Shopping ads on YouTube and Direct Offers Demand Gen campaigns.

The expansion landed today at Google Marketing Live, alongside a wider package of UCP updates including the launch of Universal Cart with major retailers, Affirm and Klarna inside Google Pay, geographic expansion, two new verticals, and new AI tools for retailers in Merchant Center.

Background on UCP And Expansion

Google launched the Universal Commerce Protocol in January as an open standard for agentic commerce, a common protocol that lets AI agents, consumer surfaces, merchants, and payment providers operate across the full shopping journey. The company co-developed the standard with Shopify, Etsy, Wayfair, Target, and Walmart.

Google’s UCP lets retailers plug their product catalog and checkout flow into Google’s ecosystem so their products can appear across Google products. The merchant still remains the seller of record, but Google can surface their products, support checkout through Google Pay in some cases, or redirect users back to the merchant’s site to complete purchase.

Since launch, Google has extended UCP checkout to AI Mode and Gemini, expanded it to main Search results earlier this month with Wayfair as the first live retailer, and opened merchant onboarding. The Marketing Live update is the first time UCP has been wired into ad inventory rather than organic surfaces.

Google will roll the UCP-powered checkout to Canada and Australia in the coming months, with the U.K. to follow. Google is also extending the protocol to two new categories: hotel booking through AI Mode in Search, and local food delivery through Google Maps. The vertical expansion takes UCP into territory currently held by Booking, Expedia, DoorDash, Uber Eats, and Instacart.

UCP Checkout Inside Ads

Google says it is integrating UCP into ad campaigns. Brands integrated with UCP can now run Shopping ads on YouTube with product feeds in Demand Gen campaigns where shoppers complete the purchase inside the ad itself.

Advertisers can now connect their product catalog to Google’s shopping system so that ads are not just for viewing products, but for completing purchases directly inside the ad experience.

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The same checkout mechanic is being added to Direct Offers exclusive promotions. The shift turns paid placements into transaction points rather than handoff surfaces, with the retailer continuing to act as merchant of record on the back end.

Universal Cart Launches With Major Retailers

Google is launching Universal Cart, a cross-retailer cart that works across Search, Gemini, and other Google surfaces. Universal Cart is a shopping feature that lets users collect products from different online retailers into one shared cart while browsing across Google surfaces. Shoppers can add items from multiple retailers into a single cart and check out with Google Pay in a few taps, or transfer items to the merchant site to complete the purchase.

Launch partners include Nike, Sephora, Target, Ulta Beauty, Walmart, Wayfair, and Shopify merchants such as Fenty and Steve Madden.

BNPL Inside Google Pay

Affirm and Klarna buy-now-pay-later options are now embedded directly into Google Pay for UCP transactions, closing a gap with the BNPL flows already available inside Amazon, Apple Pay, and PayPal checkout.

New AI Tools in Merchant Center

Inside Merchant Center, a new AI performance insights tool gives retailers a view of their share of voice on AI surfaces against similar brands. The tool is rolling out in Australia, Canada, India, New Zealand, and the U.S. in the coming months.

Google says retailers globally can also use conversational attributes to rewrite product descriptions to reflect how people search inside AI Mode and Gemini. The company is also bringing Ask Advisor, its new Gemini-powered cross-product agent, into Merchant Center to surface insights, complete tasks, and connect across Google Ads and Google Analytics.

Strategic Implication

Pulling UCP into ad campaigns puts Google in direct competition with Amazon's closed marketplace and Shop Pay, and notably with Shopify, a UCP co-developer, over which checkout infrastructure brands use for AI-driven purchases. It also extends the broader UCP versus OpenAI ACP race The Keyword has tracked into ad inventory. With BNPL inside Google Pay, hotel and food delivery in the pipeline, and AI performance signals visible to retailers, Google is now selling UCP as a full-stack alternative to the closed checkout flows brands have historically had to choose between.