Google Launches Universal Cart to Buy Across the Web

Google has spent twenty years helping people find things to buy. What it announced at I/O this week is something different: it wants to be the place where people actually buy them. The Universal Cart is the consumer-facing piece. You can add products from anywhere inside Google, whether you are searching, watching YouTube, chatting with Gemini, or reading Gmail. The cart tracks price drops, monitors stock levels, and flags problems with your selections. The example Google gave is useful: if you are building a custom PC and add parts from several stores, the system can detect that two components are incompatible and suggest an alternative. It is rolling out in the US now and arriving in the Gemini app this summer. The payments layer is what matters more for anyone running a business. Google's Agent Payments Protocol, known as AP2, is designed to let AI software make purchases on a user's behalf without the user needing to click anything. The user sets rules upfront: specific products, a spending cap, allowed brands. When a match is found, the agent completes the purchase. This is genuinely new territory for payment systems. As one analysis put it, today's payment infrastructure assumes a human is directly clicking "buy" on a trusted website. When an autonomous agent initiates a payment, that assumption breaks down entirely. AP2 is Google's answer to that gap, using a system of digitally signed contracts that record what the user authorized, what was in the cart, and what was paid, creating an audit trail both buyer and seller can reference. The protocol has real industry weight behind it. It was developed alongside Shopify, Walmart, Target, Etsy, and Wayfair, and endorsed by Mastercard, Visa, American Express, Stripe, Adyen, and over twenty other global partners. When that many payment and retail names align on the same standard, it tends to stick. For retailers, the honest tension is this: participate or risk becoming invisible. If you integrate with Google's protocol, your products become eligible for AI-driven purchases and you gain access to high-intent buyers at the moment they decide to buy. But the transaction happens inside Google's environment, not your website. You lose the store visit, the cross-sell opportunity, the chance to capture an email address. As one retail analyst put it, products risk becoming interchangeable, ranked by price and availability rather than brand story. If you opt out, you stay in control of your customer experience, but as more shoppers adopt AI-assisted buying, you risk not showing up at all. The consumer side has its own friction. A recent survey found that 55% of consumers are now uncomfortable with AI agents making purchases automatically on their behalf, up from 30% uncomfortable just a few months earlier. Google is building the infrastructure for a behavior that a majority of potential users are still not ready for. That gap between platform readiness and consumer trust is real, and it will not close overnight. For any business that sells physical products, the practical question to ask right now is simple: how does your product data look to a machine? An AI agent buying on someone's behalf does not browse your website. It reads structured product information from a feed. Incomplete data, missing attributes, or outdated pricing means the agent skips your product entirely. Your product catalog is now your primary sales floor for this channel, not your website.