The retreat
Stripe and OpenAI launched the Agentic Commerce Protocol on September 29, 2025, with ChatGPT's Instant Checkout as its flagship feature. The pitch was straightforward: describe what you want inside ChatGPT, compare a few options, and complete the purchase without leaving the chat window. Etsy went live first. More than a million Shopify merchants, including Glossier, Vuori and Spanx, were promised to follow shortly after.
Five months later, OpenAI pulled the feature back. CNBC reported on March 20, 2026 that OpenAI was reworking Instant Checkout after the retailers who had rushed to support it saw it underperform. By February 2026, Forrester principal analyst Emily Pfeiffer counted roughly 30 Shopify merchants actually live on the protocol, not the million once promised.
The clearest number came from Walmart. The retailer made around 200,000 products available for in-chat purchase starting in November 2025. Walmart EVP Daniel Danker told CNBC that checkout completed inside ChatGPT converted at about one-third the rate of sending the same shoppers to walmart.com to finish the purchase.
What actually failed
It was not the AI agent's ability to find things. Coverage of the pullback describes ChatGPT's product search and comparison as the part that worked well enough to keep. What broke down was everything downstream of "add to cart." Shoppers did not want an item bought inside ChatGPT to arrive in a separate box from the rest of their Walmart order. Loyalty accounts did not carry over, and returns and multi-item carts were harder to manage across two disconnected systems.
That is a specific, mechanical failure, not a verdict on agentic commerce as a category. Checkout is not one action. It is a chain of systems, cart, tax, loyalty, fulfillment, returns, that retailers have spent decades building and tying together. A chat interface can approximate the first of those. It cannot easily absorb the rest without the retailer's own infrastructure sitting underneath it.
OpenAI's fix, announced in the same March 2026 reporting, moves checkout back toward the retailer. Walmart is building its own assistant, Sparky, to run inside ChatGPT with carts synced to Walmart's own systems, rather than letting ChatGPT complete the transaction on its own rails.
The protocol built by retailers, not around them
Google and Shopify had already made a different bet. Their Universal Commerce Protocol launched at the NRF Big Show on January 11, 2026, co-developed not by an AI lab acting alone but jointly with Etsy, Wayfair, Target and Walmart. More than 20 partners endorsed it at launch, including Visa, Mastercard, American Express, Best Buy and Zalando.
UCP still lets an agent complete a purchase without the shopper leaving the conversation. The difference from OpenAI's original design is structural: the retailers whose loyalty programs, carts and fulfillment systems the checkout depends on were in the room writing the standard, not reacting to one built without them. Walmart's presence on both sides of this story, burned by one checkout model in November and a co-author of a different one in January, is worth noting on its own terms even without a stated causal link between the two.
What we're watching
The open question is not whether AI agents belong in retail. Product discovery inside a chat interface is already useful enough that OpenAI kept it. The open question is who gets to own the transaction once discovery ends, and the early evidence says it stays with whoever already owns the loyalty account, the cart and the warehouse.
Two things will test that this year. The first is whether Walmart's Sparky, running inside ChatGPT but settling through Walmart's own systems, converts better than the model it replaces. The second is whether Google's Universal Cart, which launched at Google I/O on May 19, 2026 with partners including Nike, Sephora, Target, Ulta Beauty, Walmart and Wayfair, holds up at real volume. Google is hedging on the same question OpenAI just answered the hard way. A purchase through Universal Cart can either complete inside Google Pay or hand off to the merchant's own site, leaving the retailer, not the AI platform, as the one who decides which path the customer takes.
Commerce platform vendors watching this fight should take the specific lesson, not the broad one. Agents can shop. Retailers still check out.
Sources
- Stripe. "Stripe powers Instant Checkout in ChatGPT and releases Agentic Commerce Protocol codeveloped with OpenAI." 2025. https://stripe.com/newsroom/news/stripe-openai-instant-checkout
- CNBC. "OpenAI's first crack at online shopping stumbled. It's preparing for the next wave." 2026. https://www.cnbc.com/2026/03/20/open-ai-agentic-shopping-etsy-shopify-walmart-amazon.html
- CNBC. "OpenAI revamps shopping experience in ChatGPT after struggling with Instant Checkout offering." 2026. https://www.cnbc.com/2026/03/24/openai-revamps-shopping-experience-in-chatgpt-after-instant-checkout.html
- Forrester (Emily Pfeiffer and Sucharita Kodali). "What It Means That The Leader In 'Agentic Commerce' Just Pulled Back." 2026. https://www.forrester.com/blogs/what-it-means-that-the-leader-in-agentic-commerce-just-pulled-back/
- MarTech. "Walmart says ChatGPT checkout converted 3x worse than its own website." 2026. https://martech.org/walmart-says-chatgpt-checkout-converted-3x-worse-than-its-own-website/
- Google. "Read Sundar Pichai's remarks at the 2026 National Retail Federation." 2026. https://blog.google/company-news/inside-google/message-ceo/nrf-2026-remarks/
- Google Developers Blog. "Under the Hood: Universal Commerce Protocol (UCP)." 2026. https://developers.googleblog.com/under-the-hood-universal-commerce-protocol-ucp/
- Retail Dive. "Google launches cross-retailer Universal Cart." 2026. https://www.retaildive.com/news/google-launches-cross-retailer-universal-cart/820957/