According to PPC Land (16 October 2026), Google began rolling out on 15 October the Universal Cart in the US, in Search (including AI Mode) and the Gemini app: a cart that gathers items from several stores, tracks price and stock and lets users pay with Google Pay or hand the purchase to the merchant’s site through the Universal Commerce Protocol (UCP). Google says the merchant remains the seller. There is no information on availability in Portugal, fees, ranking or number of merchants.
What was launched
Google announced the Universal Cart at I/O on 19 May and promised a US launch in summer. According to PPC Land, it arrived on 15 October, about five months later, in Search (including AI Mode) and the Gemini app, without YouTube or Gmail, which Google had mentioned in May.
The cart holds items from several stores and keeps them across Search and Gemini. It tracks price and stock, alerts about price drops and restocks, and shows promo codes and card benefits through Google Wallet.
How payment works and who sells
The user can pay with Google Pay, or the cart hands the purchase to the merchant’s site through the Universal Commerce Protocol (UCP). The source cites merchants such as Nike, Sephora, Target, Ulta Beauty, Walmart, Wayfair and “many Shopify merchants”. Google states that merchants “will remain the seller of record”.
The launch text does not address merchant fees, product ranking, data sharing or how many merchants participate, according to the source.
Universal Cart
Confirmed
- Launched 15 October in the US
- Search, AI Mode and Gemini
- Pay by Google Pay or via UCP
Not known
- Availability in Portugal
- Merchant fees
- Product ranking
What UCP is
The Universal Commerce Protocol is the open protocol that lets an AI agent or a universal cart talk to the shop: see products, prices, stock and start a purchase. The source says an Originality.ai scan found only 26 detectable implementations across more than three million sites, suggesting adoption is still low.
For a Portuguese shop, UCP is a topic to follow, not an obligation. The e-commerce platform you use may offer it as a feature.
Shopping Graph: Google's numbers
The source indicates the Shopping Graph has more than 60 billion listings and that over 2 billion are refreshed every hour. These are Google’s numbers. What matters to you is that your catalogue is read from Merchant Center and product pages, and that data quality decides whether and how you appear.
If the Universal Cart saves price and stock, an outdated feed can be worse than absence: the customer sees a price that is no longer true.
An outdated feed can be worse than absence: the customer sees a price that is no longer true.
Availability in Portugal: what is known
The source limits the launch to US shoppers. There is no date or confirmation for Portugal or the European Union. Don’t assume availability, nor bet budget on something not yet in your market.
What you can do is prepare the foundation, which serves anyway: correct feed, quality images, clear returns policy, shipping data and current payment platforms.
Relation to Meta's product browsing
The same source records that Meta switches on in-app product browsing in existing ads on 28 October 2026, with an email notice on 15 October. Meta indicates about 3% more conversions in an experiment from 6 to 21 August with about 117,700 advertisers, without defining the metric. Black Friday is on 27 November, about 30 days later.
The two novelties point in the same direction: purchase happening more and more inside the platform, before reaching your site.
What to do in a Portuguese shop now
Review the feed (prices, stock, GTIN, images). Check whether your e-commerce platform plans to support UCP. Define how you measure sales that begin in third-party environments. Keep customer service and returns impeccable. Record all AI commerce novelties in a dated list.
None of this is costly, and all of it is useful even if the Universal Cart never reaches Portugal.
Questions for your manager
Is our feed ready for AI shopping environments? Does our platform support UCP? How do we measure purchases that begin outside our site? Which AI commerce novelties will we follow, and who records them?
If you want to prepare your catalogue and measurement for AI commerce, without betting on something that hasn’t arrived, I can help build a preparation plan.
An illustrative preparation example
A Portuguese online cosmetics shop has 400 products. In two weeks, it fixes missing GTIN in 60 products, updates images with clean backgrounds, aligns prices and stock with the page and writes the returns policy on its own page. The example is hypothetical. The gain comes in all shopping channels, today and tomorrow, and doesn’t depend on the Universal Cart reaching Portugal.
Summary in three lines
The Universal Cart launched on 15 October only in the US. There is no information on Portugal. Prepare feed, data and measurement, and follow developments without betting budget on something that doesn’t yet exist in your market.
Common mistakes when preparing the catalogue
Updating prices on the site and forgetting the feed; leaving out-of-stock products active; using generic titles; ignoring identifiers such as GTIN; and not having a visible returns policy. Each error reduces eligibility and trust. Fixing these points costs time, not budget.
Frequently asked questions
Is the Universal Cart in Portugal?
There is no confirmation. The source refers to launch for US shoppers.
Who is the seller?
Google says the merchant remains the seller of record, according to the source.
Do I have to implement UCP?
It isn’t mandatory. It’s a protocol to follow. Ask your e-commerce platform.