Google’s Universal Cart wants to follow you everywhere you shop

Google on Could 19 unveiled the Common Cart at Google I/O 2026, a single clever purchasing cart that spans retailers, surfaces, and companies – including a consumer-facing entrance finish to the agentic commerce infrastructure the corporate has been assembling since early 2025.

Google processes greater than a billion purchasing interactions per day, in accordance with Vidhya Srinivasan, Vice President and Basic Supervisor of Adverts and Commerce at Google, who authored the announcement. That quantity runs on the Buying Graph, described by Google because the world’s most complete product catalog with over 60 billion product listings. The Common Cart is introduced as the subsequent layer on high of this infrastructure – not a brand new database, however a brand new interface that ties collectively the cost, protocol, and AI work Google has been constructing within the open.

The announcement got here on Could 19 at Google I/O 2026 and was revealed on Google’s The Key phrase weblog. It marks the patron debut of applied sciences that had beforehand been accessible solely to builders and early service provider companions.

Common Cart: what it’s and the way it works

The Common Cart is described as a purchasing cart that operates throughout retailers and companies concurrently. In keeping with Srinivasan, a consumer can add objects whereas shopping Search, chatting with Gemini, watching YouTube, or studying Gmail. The cart is just not merchant-specific. Objects from a number of retailers sit in a single place.

As soon as a product is added, the cart begins working within the background. In keeping with Google’s announcement, it finds offers and worth drops, surfaces worth historical past insights, and sends alerts when an out-of-stock merchandise turns into out there once more. All of this runs on Gemini fashions, that means the system improves as these fashions are up to date.

The cart additionally applies what Google describes as “clever reasoning” to anticipate issues earlier than they come up. The instance given within the announcement is instructive: a consumer assembling a customized PC from components sourced at a number of completely different retailers would see the cart proactively flag element incompatibilities and counsel options. This goes past easy worth monitoring. It implies the cart maintains a semantic understanding of what objects are in it and the way they relate to one another.

As a result of Common Cart is constructed on high of Google Pockets, it has entry to saved cost strategies, loyalty programme info, and service provider presents. In keeping with the announcement, this permits the cart to establish financial savings or factors alternatives {that a} shopper won’t discover on their very own – with out requiring the consumer to recollect every retailer’s perks programme independently.

Checkout from the Common Cart makes use of the Common Commerce Protocol (UCP), an open customary Google co-developed with major retailers in January 2026. Consumers pays utilizing Google Pay in a couple of faucets or switch their cart to the product owner’s web site to finish the acquisition there. The preliminary roster of supported retailers at launch contains Nike, Sephora, Goal, Ulta Magnificence, Walmart, Wayfair, and Shopify retailers together with Fenty and Steve Madden. In all instances, the model stays the service provider of document – a structural element Google has emphasised persistently since January to differentiate the mannequin from a market association the place Google would itself develop into the vendor.

Common Cart is rolling out throughout Search and the Gemini app in the US this summer time. YouTube and Gmail integrations observe later, with no particular date given.

The Common Commerce Protocol will get wider

The Common Commerce Protocol, which serves because the technical spine for the Common Cart’s checkout functionality, can be increasing geographically. In keeping with the Could 19 announcement, UCP-powered checkout will lengthen to Canada and Australia within the coming months and later to the UK. UCP can be coming to YouTube in the US.

That could be a significant step. As documented on PPC Land, when Google revealed its official Service provider Heart assist web page for UCP on March 2, 2026, the function had been restricted to eligible United States retailers. The technical structure at that time relied on funding main account numbers (FPANs) saved in Google Pockets, with particular cost service supplier necessities that not each service provider had happy. The transfer to Canada, Australia, and the UK extends that structure internationally.

Google can be increasing UCP into new verticals. Lodge reserving and native meals supply are the 2 classes named within the announcement, with the corporate describing them as “beginning quickly.” This takes UCP past its unique retail items context into service transactions with completely different fulfilment traits – reservations, time-based availability, and location-specific stock all function in another way from a product shipped from a warehouse.

The UCP Tech Council expanded in April 2026 when Amazon, Meta, Microsoft, Salesforce, and Stripe joined as members, bringing the governance construction properly past its unique founding companions. Amazon’s inclusion was significantly famous by analysts, given the corporate had beforehand blocked third-party AI brokers from accessing its platform.

AP2: letting brokers pay in your behalf

The third main element within the Could 19 announcement is the Agent Funds Protocol, known as AP2. That is distinct from UCP, which governs how checkout periods are established and managed. AP2 addresses the particular drawback of authorising funds that an AI agent initiates and not using a human clicking “purchase” at that second.

In keeping with Google’s announcement, AP2 works by permitting customers to set strict guardrails for agentic transactions. A consumer specifies which manufacturers or merchandise are acceptable, and the way a lot the agent is permitted to spend. The agent solely executes a purchase order when the pre-set standards are met.

The technical mechanism includes what the announcement describes as a clear, verifiable hyperlink between the consumer, the service provider, and the cost processor. Privateness-preserving know-how is used to guard consumer knowledge. Crucially, AP2 generates tamper-proof digital mandates – information that verify the agent was appearing on the consumer’s behalf. In keeping with the announcement, this creates a everlasting digital paper path that each the consumer and the service provider can reference within the occasion of a return or dispute. The documentation phrasing is restricted: “for those who ever have to make a return, you and the service provider are trying on the identical document.”

AP2 is just not a brand new idea in isolation. As covered by PPC Land, the FIDO Alliance introduced on April 28, 2026, that Google had donated AP2 to the organisation, alongside Mastercard contributing its Verifiable Intent framework. On the identical time, Google launched AP2 v.0.2 on GitHub, introducing “Human Not Current” cost functionality – permitting brokers to execute purchases and not using a human within the loop on the exact second of the transaction, based mostly on beforehand authorised directions.

The timeline for AP2 reaching shoppers is concrete. In keeping with the Could 19 announcement, Google will start bringing AP2 to its personal merchandise within the coming months, beginning with Gemini Spark – a product not described additional within the announcement however positioned because the preliminary deployment automobile.

Mastercard’s Verifiable Intent framework, launched in March 2026 alongside AP2 and co-developed particularly to be suitable with it, addresses whether or not a transaction was authorised in the best way the patron meant – a narrower however legally vital query that sits alongside the cost circulation itself.

The infrastructure beneath the cart

The Common Cart doesn’t exist in isolation. It represents the convergence of a number of separate technical tracks that Google has been creating since at the least November 2025.

In November 2025, Google deployed agentic checkout throughout Search and Gemini, introducing the power for the system to autonomously buy price-tracked objects once they hit a goal worth. That function required express consumer affirmation and relied on Google Pay credentials already saved in Google Pockets. The Buying Graph at that time contained greater than 50 billion product listings, with 2 billion receiving hourly updates – a scale of knowledge infrastructure that the Common Cart now attracts upon extra immediately.

The Universal Commerce Protocol launched on January 11, 2026, on the Nationwide Retail Federation’s annual convention, with Shopify, Etsy, Wayfair, Goal, and Walmart as co-developers. The protocol established REST and JSON-RPC transport layers, outlined 4 participant roles – Platforms, Companies, Credential Suppliers, and Fee Service Suppliers – and specified core capabilities together with checkout session administration, id linking by way of OAuth 2.0, order lifecycle webhooks, and cost token trade.

By March 2, 2026, Google had published its official Merchant Center help page documenting the UCP integration necessities, together with the native_commerce attribute, FPAN cost credentials, and PSP compatibility expectations. That documentation revealed that retailers don’t have to allow the Google Pay API button on their current checkout surfaces to take part in UCP – a element related for retailers involved in regards to the implementation burden.

On Could 5, 2026, UCP checkout moved out of AI Mode and into fundamental Search outcomes for the primary time, with a Purchase button showing immediately in customary Search listings – documented initially with a Wayfair couch itemizing by SERP researcher Brodie Clark. That growth meant UCP was now not confined to the conversational AI floor.

The Could 19 Common Cart announcement brings all of those tracks collectively right into a single named product with a client id, a rollout schedule, and a particular set of launch retailers. The Buying Graph, now cited at over 60 billion listings, supplies the underlying product knowledge.

What this implies for retailers and advertisers

The Common Cart adjustments the purpose at which a consumer’s consideration turns into a transaction. Historically, a product added to a retailer’s personal cart was understood as excessive business intent – however the shopper was nonetheless on the retailer’s web site, topic to that retailer’s abandonment, retargeting, and conversion methods. Underneath the Common Cart mannequin, intent is captured inside Google’s floor and doubtlessly resolved there as properly.

As documented by PPC Land in January 2026, UCP’s structure carries structural implications for e-commerce platforms. Cart abandonment dynamics shift when transaction management strikes from merchant-side checkout to an AI agent. Business knowledge exhibits cart abandonment charges approaching 70 %, and substantial retail income has traditionally been recovered by way of abandonment electronic mail campaigns and retargeting. If a consumer by no means abandons the cart as a result of checkout occurs inside Google’s interface, these restoration mechanisms function in a special context.

For manufacturers like Nike, Sephora, and Ulta Magnificence named within the Could 19 launch, collaborating within the Common Cart at launch supplies early positioning. The merchant-of-record construction preserved by UCP means the model retains the shopper relationship and buy knowledge – however the discovery and checkout moments happen on Google’s floor somewhat than the model’s personal web site.

Google’s 2026 retail ad briefing, revealed on April 8, outlined the preparation retailers ought to undertake for agentic commerce: wealthy product feeds with high-quality textual content and pictures, linked first-party knowledge, up to date tags and knowledge managers, and conversions with cart knowledge. Upgrading to the Service provider API for real-time stock was described as crucial for agentic commerce eventualities the place stock standing have to be correct to the second. That steering maps on to Common Cart eligibility.

The geographic growth of UCP to Canada, Australia, and the UK additionally has implications for worldwide retailers. The technical necessities – FPAN credentials, PSP configuration, the native_commerce attribute in Service provider Heart feeds – will have to be happy in these markets because the rollout arrives.

Context: Google I/O 2026 and the broader sample

The Could 19 bulletins are half of a bigger collection of reveals at Google I/O 2026, positioned by Google as a showcase for its AI capabilities throughout client merchandise. The Common Cart sits alongside different I/O bulletins not coated on this article.

The shopping-specific observe at I/O displays how far agentic commerce has moved from idea towards operational product in roughly six months. Shopping ads entered AI Mode on February 11, 2026, because the floor reached over 75 million every day energetic customers. Ulta Magnificence launched agentic commerce inside AI Mode in late April 2026. Throughout Alphabet’s Q1 2026 earnings name on April 29, Philipp Schindler described agentic experiences as “additive” to current purchasing behaviour somewhat than a displacement of it.

Whether or not that characterisation holds at scale stays to be seen. The structural questions that PPC Land identified when UCP launched in January – round surveillance pricing considerations, client adoption of conversational purchasing, and the aggressive dynamics between open requirements and proprietary platforms – haven’t been totally resolved by the Could 19 bulletins. Google’s response on the time was that retailers can not present costs increased than these on their very own websites, a coverage constraint constructed into the UCP specification.

The Common Cart is, at its core, a wager that the interface layer of purchasing can shift from being merchant-controlled to being Google-controlled with out breaking the business relationship between manufacturers and shoppers. The summer time rollout in the US will present the primary vital market knowledge on whether or not that wager holds.

Timeline

• November 13, 2025 – Google deploys agentic checkout and AI shopping tools throughout Search and Gemini, with autonomous buy functionality and Duplex store-calling; Buying Graph reaches 50 billion product listings
• January 11, 2026 – Google launches the Universal Commerce Protocol on the Nationwide Retail Federation convention, co-developed with Shopify, Etsy, Wayfair, Goal, and Walmart; Target and Walmart simultaneously enable checkout contained in the Gemini app and AI Mode; Mastercard launches Agent Pay alongside UCP
• January 13, 2026 – Google responds to surveillance pricing criticism following UCP launch, confirming retailers can not present costs increased than on their very own websites
• February 11, 2026 – Google introduces shopping ads in AI Mode because the floor exceeds 75 million every day energetic customers
• March 2, 2026 – Google publishes official Merchant Center help page for UCP, detailing the native_commerce attribute, FPAN cost credentials, and PSP compatibility necessities
• March 5, 2026 – Mastercard and Google introduce Verifiable Intent, a cryptographic belief customary co-developed particularly for compatibility with AP2
• April 8, 2026 – Google publishes its 2026 retail ad briefing, outlining service provider preparation steps for agentic commerce together with Service provider API migration
• April 24, 2026 – Amazon, Meta, Microsoft, Salesforce, and Stripe be part of the UCP Tech Council, extending governance past unique founding companions
• April 28, 2026 – FIDO Alliance announces AP2 donation from Google and releases AP2 v.0.2 with “Human Not Current” cost functionality
• April 29, 2026 – Throughout Alphabet Q1 2026 earnings name, Philipp Schindler describes agentic experiences as “additive” to purchasing behaviour
• Could 5, 2026 – UCP checkout expands from AI Mode into main Search results for the primary time, documented with a Wayfair itemizing in customary outcomes
• Could 19, 2026 – Google declares Common Cart at Google I/O 2026, together with geographic growth of UCP to Canada, Australia, and the UK, vertical growth into lodge reserving and meals supply, and AP2 rollout beginning with Gemini Spark; Buying Graph cited at over 60 billion product listings

Abstract

Who: Google, by way of Vidhya Srinivasan (VP/GM Adverts and Commerce), introduced the Common Cart and associated updates at Google I/O 2026 on Could 19, 2026. Launch retailers embrace Nike, Sephora, Goal, Ulta Magnificence, Walmart, Wayfair, and Shopify retailers together with Fenty and Steve Madden.

What: Google launched the Common Cart – an clever, cross-merchant purchasing cart working on Gemini fashions and built-in with Google Pockets – alongside the geographic and vertical growth of the Common Commerce Protocol, and the upcoming client deployment of the Agent Funds Protocol (AP2) beginning with Gemini Spark. The Common Cart screens worth drops, flags product incompatibilities, surfaces loyalty advantages, and permits checkout by way of Google Pay or service provider web site switch. AP2 supplies cryptographically verifiable authorisation for agent-initiated purchases, with tamper-proof digital mandates forming a shared transaction document for buyers and retailers.

When: Introduced on Could 19, 2026, at Google I/O 2026. Common Cart rolls out in the US throughout Search and the Gemini app this summer time, with YouTube and Gmail to observe. UCP growth to Canada, Australia, and the UK, and vertical growth into lodge reserving and native meals supply, begins within the coming months. AP2 reaches Google merchandise within the coming months beginning with Gemini Spark.

The place: The US is the first launch marketplace for Common Cart. UCP-powered checkout is increasing to Canada, Australia, the UK, and YouTube within the US. AP2 integration begins inside Gemini Spark. The announcement was revealed on Google’s The Key phrase weblog.

Why: Google is assembling a consumer-facing interface layer that connects its Buying Graph, Gemini AI fashions, Google Pockets infrastructure, and the Common Commerce Protocol right into a unified product. The Common Cart strikes the checkout second from merchant-controlled surfaces into Google’s personal surfaces, with retailers remaining the service provider of document. The broader sample, tracked by PPC Land since November 2025, is the progressive shift of commerce intent seize and transaction completion towards Google’s AI interfaces.