Google launches Universal Cart across Search and Gemini in the US
Google's Universal Cart gathers products from different stores in one cart, flags price drops and enables quick Google Pay checkout at participating merchants. Underneath are protocols that let AI agents shop on a user's behalf.
What happened
On 15 October Google rolled out Universal Cart in the US across Search and the Gemini app. Previewed at Google I/O in May, it gathers products from multiple retailers in one cart that remembers progress. YouTube and Gmail are next.
How it works
The cart draws on more than 60 billion listings in Google's Shopping Graph and runs on Gemini models. It sends price-drop and back-in-stock alerts, shows price history and flags incompatible parts, for example in a custom PC build. Built on Google Wallet, it accounts for card perks and promo codes. Quick Google Pay checkout works at Nike, Sephora, Target, Ulta Beauty, Walmart, Wayfair and many Shopify merchants.
Background
The Universal Commerce Protocol (UCP), co-developed with retailers, standardises checkout; the merchant remains seller of record. The Agent Payments Protocol (AP2) lets AI agents buy within user-set limits, with each purchase creating a tamper-proof mandate used for returns.
Why it matters
The gap between search and payment is closing. Shoppers can search, compare and pay without leaving Google, reducing traffic to store sites and raising the importance of product data. With AP2, the shopper is increasingly software acting for a person.
What rivals do
OpenAI enabled instant checkout in ChatGPT for Etsy and Shopify merchants, Amazon offers a similar experience through Rufus, and Perplexity moved into agent shopping with PayPal. Visa and Mastercard are building infrastructure to verify agents. Whoever controls the screen where shopping starts collects both ad revenue and payment fees.
What comes next
UCP checkout expands to Canada and Australia in the coming months, then the UK, plus YouTube, hotel booking and local food delivery. No date for Turkey.
Merchants elsewhere can prepare now by cleaning up product feeds, since the same data will power agent checkout when it arrives in new markets.
What it means for your business
Keep price, stock, size, compatibility and shipping data structured and current, maintain your Merchant Center feed, avoid artificial discounts now that price history is visible, and publish clear return terms.