This week in AI commerce: Google's Universal Cart lands, Amazon retires Rufus, Stripe and Visa double down

Six weeks since the last roundup, and the pace hasn’t slowed — if anything, the May moves are bigger. Google ships its long-awaited cross-merchant cart at I/O, Amazon kills off Rufus in favor of a unified Alexa shopping agent, and on a single day at the end of April, both Stripe and Visa shipped headline agentic-commerce announcements (Stripe Sessions and Visa’s Agentic Ready Program global expansion).

Here’s what happened across mid-May 2026, and what it means for brand teams trying to keep up.

---

Google: Universal Cart, finally

Google I/O 2026 introduces the Universal Cart

At Google I/O 2026 on May 19, Google unveiled the Universal Cart — an intelligent shopping hub that works across Search, Gemini, YouTube, and Gmail. Shoppers can add items from different retailers into a single cart, get automatic deal tracking, price-history checks, restock alerts, incompatibility flags, and loyalty-aware savings optimization. Checkout integrates with Google Pay.

Launch retailer partners include Nike, Sephora, Target, Ulta Beauty, Walmart, and Wayfair, plus Shopify merchants Fenty and Steve Madden. Universal Cart rolls out across Search and Gemini in the U.S. this summer, with YouTube and Gmail following. Universal Commerce Protocol checkout expands to Canada and Australia “in coming months,” then to the U.K., with UCP also coming to YouTube and to verticals beyond retail starting with hotel booking and local food delivery.

The framing from Vidhya Srinivasan, VP/GM of Ads and Commerce: “We’re building the foundation for agentic commerce, with updates including a new intelligent cart that brings superpowers to your shopping.”

The strategic read: Google has been gradually positioning UCP as the cross-merchant standard since January’s launch with Shopify and the retailer coalition. The Universal Cart is the consumer-facing manifestation. For brands not yet integrated with UCP, this is the moment to stop watching and start building — every retailer named at I/O is already in.

---

Amazon: Rufus is dead, long live Alexa for Shopping

Amazon retires Rufus on May 13

Amazon announced on May 13 that it was retiring its standalone Rufus chatbot, folding the experience into Alexa for Shopping — a unified agentic assistant that runs across the Amazon Shopping app, the website, and Echo Show smart displays.

Rufus reached an estimated 300 million users during its run. The technology underneath — conversational shopping engine, personalized recommendation logic, shopping-history layer — all gets preserved and rebranded as Alexa for Shopping. The new product handles voice and text input, can compare products, track prices, trigger conditional purchases, and through the “Buy for Me” feature can extend purchasing across non-Amazon online stores.

The pivot makes Alexa for Shopping the default AI layer for every signed-in U.S. customer on the Amazon Shopping app and website — no Prime or Echo device required.

The strategic read: Amazon has been a holdout in the agentic-commerce platform race. While Google ships UCP-powered cross-merchant carts and Shopify auto-syndicates catalogs to multiple AI surfaces, Amazon’s primary AI play was a chatbot. The Alexa rebrand isn’t just nomenclature — it consolidates Amazon’s two parallel AI strategies (Rufus on the shopping side, Alexa on the device side) into a single agentic surface that crosses screens. The “Buy for Me” feature reaching off Amazon’s own marketplace is the more aggressive move: Amazon’s agent is being positioned to mediate purchases on competitor sites.

For brands selling on Amazon, this means the AI surface mediating discovery is now the same brand and same product as the voice assistant on millions of Echos. For brands selling off Amazon, it means an Amazon agent may show up as a buyer at your checkout — with Amazon shipping the order on your behalf.

---

Payments infrastructure: Stripe and Visa, same day

Stripe Sessions 2026: 288 launches, agentic commerce front and center

At Stripe Sessions on April 29, Stripe announced 288 new products and features in front of 9,000+ business leaders. The agentic commerce announcements were the headline:

• Agentic Commerce Suite expansion — businesses can sell across AI agents by uploading their catalog and managing agent access directly from the Stripe Dashboard.
• Stripe-Google partnership for UCP checkout — “Customers will soon be able to buy your products in AI Mode and the Gemini app via the Universal Commerce Protocol (UCP), through a new partnership between Stripe and Google.”
• Meta partnership — native checkout inside Facebook ads, so the discovery-to-purchase flow stays inside Meta surfaces.
• Machine Payments Protocol (MPP) — co-authored by Stripe and Tempo, enables agents to programmatically transact via microtransactions and recurring payments using Shared Payment Tokens. Accepts stablecoins and fiat (cards, Klarna, Affirm).
• Link agent wallet — users can grant their AI agents the ability to pay with Link’s wallet (250M+ users globally), with spending approvals and full purchase visibility. Expanded payment methods include Pix (Brazil), stablecoins, and UPI (India preview).

The Stripe-Google UCP partnership is the most significant single announcement. It pairs the dominant ecommerce payments platform with the dominant agentic-cart launch and validates UCP as a primary protocol — sitting alongside Stripe’s existing ACP work with OpenAI.

Visa’s Agentic Ready Program goes global — same day

In one of the more deliberate same-day announcements of the year, Visa announced global expansion of its Agentic Ready Program on April 29 — pushing into Asia Pacific and Latin America with 85+ new partners joining the initiative (which was previously live in the UK and Europe with 20+ partners).

The program lets financial institutions test AI agent-initiated payments in live environments — validating enrollment, tokenization, authentication, and authorization flows before brands scale agentic acceptance. It builds on the Intelligent Commerce Connect launch from April 8.

The framing from Rubail Birwadker, SVP of Growth Products & Partnerships: “Across markets, we’re seeing growing interest in how AI agents could reshape commerce. Visa Agentic Ready provides banks and issuing partners with a structured path to testing agent-initiated payments, learning what works, and ensuring global readiness as these experiences reach scale.”

The pattern

Two of the three companies named in Juniper Research’s payments infrastructure leaderboard — Stripe and Visa — shipped headline agentic-commerce platform announcements on the same business day. The third (Mastercard) has continued live transaction work across APAC markets through the spring.

The payments layer isn’t just racing ahead of the commerce layer anymore. It’s converging on a stable shape: protocol-abstraction acceptance (Visa Intelligent Commerce Connect, Stripe Agentic Commerce Suite), live-environment testing programs (Visa Agentic Ready, Mastercard Agent Pay pilots), and agent-grantable consumer wallets (Stripe Link, Visa Intelligent Commerce APIs). A brand that doesn’t have a payment partner thinking actively about this layer is now meaningfully behind.

---

Also on the radar

Shopify Agentic Storefronts continue expanding. Since Shopify launched Agentic Storefronts on December 10, 2025 as part of its Winter ‘26 Edition, eligible merchant catalogs syndicate to ChatGPT, Perplexity, and Microsoft Copilot — no per-platform integration required from the merchant. Setup is a single workflow inside the Shopify admin, and the platform list continues to grow.

Perplexity’s Comet browser hits Android. After going free on iOS in March, Perplexity’s Comet AI browser launched on Android — Perplexity’s flagship 2026 release, positioned as a browser-native agentic surface.

OpenAI continues to evolve ChatGPT shopping. After pulling back from Instant Checkout in March, OpenAI has been adding to ChatGPT’s product discovery experience — conversational filtering, visual browsing, and merchant-fed catalog integrations remain the primary investments.

---

What it all means

Three themes from May:

1. The cross-merchant cart is becoming a shopping primitive. Google’s Universal Cart formalizes the pattern: one cart, many merchants, smart agent helping you fill it. The cart is no longer purely a per-merchant artifact tied to a single brand’s website. For brands, this means the cart is increasingly mediated by a third party (Google, Amazon, Shopify, eventually others), and brand-specific cart UX matters less than whether the brand’s products show up in the cross-merchant cart at all.

2. Amazon’s pivot resolves the platform-control question for one player and intensifies it for everyone else. By unifying Rufus and Alexa under a single agentic brand, Amazon is signaling that AI agents are not a feature — they’re the surface. Every other platform now has to answer the same question Amazon just answered: what’s our agent, where does it live, and what does it do with the customer’s intent? Google’s Universal Cart is one answer. Shopify Agentic Storefronts is another. Most retailers don’t have one yet.

3. The infrastructure layer is consolidating; the brand layer isn’t. Payments, identity, cart, and agentic discovery are all converging into shippable pieces from Google, Amazon, Shopify, Stripe, and Visa. What isn’t converging is the catalog readiness on the brand side — the structured data, the descriptive depth, the identifier coverage, the real-time pricing accuracy that determines whether an AI agent recommends a brand’s products in the first place. The brands that close that gap before the agents start picking favorites will capture the agentic share Juniper is sizing. The rest will watch their competitors pick it up.

If you want to know where your product data stands across the surfaces that matter — Google AI Mode, ChatGPT, Perplexity, Amazon’s Alexa for Shopping, Merchant Center, and the rest — get in touch. The AI Readiness Score tells you exactly what to fix first.