Google's New Shopping Cart: What it Means for Online Businesses.

Google has now got its own shopping cart - and it's pretty interesting. It sits across Search, the Gemini app, and later YouTube and Gmail, holding products from loads of different shops at the same time. This is called Universal Cart, and we got a glimpse of it at Google I/O back in May 2026. It's now live in the US and available to use from 15 October.

If you sell online, you need to take a good hard look at this. For about twenty years now, the deal with Google has been pretty simple: they help people find things, send them to your website to buy. The checkout, order confirmation and the whole shebang used to all happen on your turf. But with Universal Cart, Google is moving a fair chunk of that journey onto their own patch instead.

Don't panic though - you're still the one selling the products and shipping them out. Google is clear that you're still the "merchant of record". But it does mean shoppers are making up their minds in a different place, seeing different information and having a different experience. This article is going to walk through what Universal Cart is, how it works, what it means for online retailers (especially Aussie ones, as the checkout side is heading our way), and what you can do about it.

How Universal Cart Works from the Shopper's Point of View

The easiest way to get your head around this is to picture someone using it. Let's say Priya is sorting out Christmas presents. She asks Search for a good pair of running shoes for her brother and adds one to her cart. Later that evening she's chatting with the Gemini app about skincare for her mum and adds a moisturiser from a different shop. A few days later, she adds a book. Three different retailers, two Google products, one cart. No loading different tabs, no taking screenshots, no trying to remember where she saw that thing.

While those items are in her cart, the cart is still working away in the background. Google has said it will:

• let her know if the price drops and show her the price history so she can work out if that "sale" is actually a good deal
• tell her when something she's got in her cart comes back in stock
• highlight any relevant promo codes that might be worth using
• look at her Google Wallet and suggest which card will earn her the best rewards or points
• flag up any problems, like parts that won't work together (Google's example is someone buying parts for a PC from different shops)

When she's finally ready to buy, she's got two options. If the shop supports it, she can pay with Google Pay in a couple of taps without ever leaving Google. Otherwise, the items are handed over to the retailer's own website, already in her basket, and she finishes off there. Either way, the retailer is still the one selling the product - the order confirmation, delivery and customer service all come from them, not Google.

The Underlying Tech

There are two bits of tech that make this all possible - and you're going to hear the acronyms a lot.

Universal Commerce Protocol (UCP) is an open standard that Google built with retailers earlier this year. Think of it like a shared language that lets Google (or any AI assistant) read your products, build a basket and do the checkout with your store in a predictable way. Google says UCP already powers direct checkout for hundreds of thousands of brands and retailers.

Agent Payments Protocol (AP2) is the bit that lets an AI agent pay for something on your behalf, within the limits you set. For example: "buy these headphones if they drop under $250". It keeps a tamper-proof record of what the shopper authorised, so if there's a return or a dispute, the shopper and the merchant are on the same page. Google says AP2 will be coming to its products in the coming months.

You don't need to know the ins and outs of either of these protocols in detail. What matters is the direction - the cart is the visible bit, and the protocols are what let AI assistants do more of the shopping on people's behalf over time.

What it Means if You Sell Online

More of the shopping decision happens on Google's turf now, and your product data is doing more of the selling than your website ever was. Here's how that plays out.

The Shortlist Gets Built Before Anyone Even Visits Your Site

For years, it was all about the product page - that's where the persuading happened. Photos, reviews, delivery promise, returns policy, that nice bit of copy about how the fabric is made. With Universal Cart, a shopper can find your product, compare it, add it to a basket and get nudged about its price without ever even loading your page. That means the thing that represents you when a shopper has to make a tough decision is largely based on your product feed: the titles, prices, images, stock info, shipping details & returns policies you send to Google Merchant Center. And if that info is thin, out of date or vague, you're essentially fighting with one hand tied behind your back. Fact is, Google itself says merchants who follow its core feed best practises see around a 5% boost in sales in the month following. And that's not just Google's own claim, so that's probably a decent yardstick to go by.

Prices get a whole lot more transparent

And the bit retailers should really focus on is the pricing side of things. Every item in the cart now gets a price tracker, history and price drop alerts. So shoppers don't just see your price for the day - they can also see if it's been any cheaper in the past and get a ping when it drops.

That in turn has a few knock-on effects:

• Inflating prices for a week to make a sale look bigger becomes a lot easier for shoppers to see through.
• If your price drops and a shopper already has the item in their cart, they'll hear about it straight away. That's got to be a win for anyone running a well-organised promotion.
• If a competitor's price drops on the same product, the shopper will hear about that too. And retailers selling identical, branded products are the ones who are most exposed to this.
• Card perks and promo codes now get surfacing in the cart too, so how you structure your offers and whether Google knows about them is a lot more important now.

Your stock and price data has to be absolutely spot on

A cart that sends alerts to people about when items become available again and price changes is only as good as the data it's based on. If your feed says an item is in stock at $89 but your site says it's sold out at $95, the shopper's going to have a pretty bad experience and you'll probably lose the sale. And with checkout happening on Google, any mismatches stop being some minor admin issue and start being a direct reason for failed orders.

The customer relationship gets a bit more distant

Google's keen to stress that you're still the merchant of record. You get the order, you send the confirmation, you deal with support and returns. That's good, and better than some of the other marketplace models.

But if a shopper checks out with Google Pay inside Google, they may never even browse your site. They won't see your other products, your sign up box, your bundles or your free shipping threshold. Fewer visits also means less data in your own analytics. And let's be honest, that's a bit of a trade-off: potentially more convenient sales in exchange for a lot less of the experience happening on your own turf.

Search traffic may look a bit weird, even if sales don't change

If more of the journey happens in AI shopping mode, Gemini and the cart, some of the clicks you used to get from Google won't be happening any more. You might see fewer product page visits but steady or even higher sales from Google-originated orders. And if you only look at organic sessions, your reporting is going to start telling a pretty misleading story. This is more or less the same shift SEOs have been talking about with AI overviews - now applied directly to checkout.

Small shops aren't automatically shut out of the party

The launch partners are all big names (Nike, Sephora, Target, Walmart, Wayfair) but Google also lists loads of Shopify merchants. Platforms like Shopify are doing a lot of the integration work, which makes it a lot easier for smaller retailers. And the cart can just hold items from any merchant in Google's Shopping Graph; direct checkout is just the extra bit on top. If your products are in Merchant Center, you're probably already in the game for the cart itself.

What you should be doing now

None of this needs a massive new project. Most of it is just getting the groundwork right that already pays off in Google Shopping - made more urgent because these new shopping tools lean on it so much. Roughly in order of effort, here's what you should be doing:

1. Get your Merchant Center in order

If you don't have a Google Merchant Center account with your products in it, start there. It's free, and it's how your products get into the Shopping Graph that the cart draws on. If you do have one, open the diagnostics and clear the warnings. Disapproved products, missing GTINs and mismatched prices are all things an AI shopping tool will quietly hold against you.

2. Make your feed sound like something a good salesperson would say

Titles that say what the thing actually is. Descriptions that answer real questions. Proper sizes, colours, materials & variants. Good images. Accurate shipping costs and delivery times. Clear returns policies. This is where most retailers have the biggest gap between "technically submitted" and "genuinely helpful". Google has also rolled out conversational attributes for AI shopping that are optional but very useful. These comprise product Q&As, links to manuals or sizing guides, related products and accessories, and cleaner information on product variants. In a recent test with Lululemon, Google says that roughly half of relevant AI Mode recommendations were featuring the brand-supplied conversational attributes. The good news is they can be added through a separate feed without affecting your main one.

3. Make sure your price and stock levels are up to date all the time

If your feed only updates once a day, you might want to think whether that's going to be enough during a sale or when stock levels are running low. A shopping cart that promises 'back in stock' alerts is going to make stale info a whole lot more visible. Usually, the solution lies in automatic item updates via Merchant Center and a direct platform integration (Shopify, WooCommerce, BigCommerce and so on).

4. Be upfront with your pricing

Let's face it, shoppers can now see your price history. Real discounts on a sensible schedule will fair far better than trying to inflate "was" prices. In Australia, the ACCC already has a dim view of misleading "was/now" pricing, and Google's price history just makes it even easier for customers to spot the difference.

5. Feed Google your special offers and loyalty perks

The shopping cart will showcase promo codes and payment perks. Thankfully, Merchant Center supports promotions and loyalty programs, including member pricing and free shipping for members. If you operate either, connecting them means they will actually appear in the cart where shoppers make their decision.

6. Chat with your platform about checkout

Native checkout on Google uses the Unified Cart Platform. Google's advice for retailers on a platform such as Shopify is to ask the platform what its plans are, rather than try to build it yourself. For retailers with a custom build, there is a developer guide and an interest form, and the Merchant Center onboarding hub is due in Australia early next year. Even if you're not ready to turn on checkout in Google, the "cart transfer" option - which passes the basket to your own site - is a gentle first step.

7. Reassess how you measure success coming from Google

Start separating "clicks from Google" from "revenue from Google". Merchant Center's AI performance insights now available in Australia will show you how often your brand and products appear across AI Mode and AI Overviews compared to competitors. Pair that with order-level reporting so a drop in sessions isn't mistaken for a drop in business.

Where things are at currently, and what we still don't know

The Universal Cart is only live in the US. For Aussie retailers, the checkout bits arrive first - and Google hasn't given a date for the cart itself here yet.

When | What happened or is planned

Early 2027 (planned) | UCP integration hub in Merchant Center - including cart transfer - rolls out in Australia and Canada
"Coming months" (from May 2026) | UCP-powered checkout on Google is going to expand to Canada and Australia, then the UK
15 Oct 2026 | Universal Cart is launched in the US across Search and the Gemini app
16 Sep 2026 | AI performance insights in Merchant Center become available in Australia, Canada, India, NZ and the US
19 May 2026 | Universal Cart announced at Google I/O; YouTube and Gmail will follow later

Some genuine open questions we still don't have the answers to are:

• When will Universal Cart itself arrive in Australia?
• How will products be ranked or recommended inside the cart?
• What data do merchants get back? If someone saves one of your products but never buys, will you actually know?
• What does it cost to use UCP-powered checkout?
• How do returns and disputes work in real life?

As is typical for Google rollouts, early versions change rapidly. The smart thing to do is to prepare the groundwork that will be useful regardless, rather than relying on the details.

What we do

Most of what's been discussed is something any retailer can tackle themselves - and we'd encourage that. If you'd like a second pair of hands, this is the kind of thing we help Spicy Web clients with on a daily basis:

• reviewing Merchant Center accounts and product feeds, and plugging the gaps that hold products back
• writing product titles, descriptions and Q&A content that works for both people and AI shopping tools
• setting up structured data, promotions and loyalty data so offers are visible where shoppers make their decisions
• keeping an eye on how your brand shows up in AI Mode and AI Overviews, and reporting on revenue, not just clicks
• having a chat with platforms about UCP checkout as it arrives in Australia

If any of the above is useful to you, we'd love the chance to bounce some ideas off you. If the guide doesn't carry any weight for you, then we at least hope it gave you a better idea of the changes taking place.