The Universal Cart is Google's "agentic cart." A single cart that works across retailers and across Google services — Search, Gemini, and soon YouTube and Gmail — powered by the Universal Commerce Protocol (UCP) and Gemini models.
How the Universal Cart works
In practice, a shopper can add products from different merchants to one cart while browsing Search, chatting with Gemini, or (eventually) watching a YouTube video. The cart automatically monitors price and availability changes after items are added, and notifies the user. At checkout, two paths coexist:
- Checkout on Google in a few taps via Google Pay at many brands;
- Handing the cart off to the merchant's site to complete the purchase in their environment.
In both cases, the retailer remains the merchant of record: customer relationship, data and after-sales belong to it.
What UCP brings to the Universal Cart
The Universal Cart is the consumer experience; UCP is the infrastructure underneath. The protocol gives agents and systems a shared language to read a catalog, understand an offer, assemble a cart and trigger a payment — without a bespoke integration for every merchant. That's what lets a single cart work across heterogeneous retailers and across Google's surfaces. Early retailers cited for the checkout features: Nike, Sephora, Target, Ulta Beauty, Walmart, Wayfair, plus Shopify merchants.
International rollout
- United States: launch market, on Search and the Gemini app, with YouTube and Gmail to follow.
- Australia: first Asia-Pacific market, launched June 17, 2026 with Bunnings, Kogan, THE ICONIC, Adore Beauty and Petbarn. Single-item purchases directly in Search (AI Mode) and the Gemini app.
- Canada then the United Kingdom: announced to follow.
Google paired the Australian launch with usage figures: AI Overviews exceeds 2.5 billion monthly users worldwide and AI Mode has passed one billion, with its queries doubling every quarter.
What it means for a merchant
The Universal Cart turns the cart into a shared surface that lives at Google, not just on your site. To show up and convert there, two levers: a high-quality product feed (structured data, identifiers, real-time availability) feeding UCP, and agent-pay acceptance. With continental Europe not in the first wave (US, Australia, Canada, UK), there's a window to prepare.
Sources
- Google, "Introducing the Universal Cart", May 2026
- retailbiz, "Google's Universal Commerce Protocol launches in Australia", June 17, 2026