The fastest retreat in commerce this year
On February 16, 2026, OpenAI launched Instant Checkout, the "Buy it in ChatGPT" experience built with Stripe on the ACP protocol. By March it had already walked the feature back, routing purchases to the retailer's own site instead. The detail that explains why is striking: of Shopify's millions of merchants, only around a dozen ever made it live, and Shopify president Harley Finkelstein publicly placed the bottleneck on the AI side, not the merchants. Fast Company's account of the race between Google and OpenAI reads less like a product launch story and more like everyone discovering, at the same time, which half of shopping AI is actually good at.
The numbers behind the retreat
Walmart supplied the clearest evidence. Purchases completed inside the chat converted three times worse than simply sending the shopper to Walmart's own site. And yet the same company found that ChatGPT delivers roughly twice as many new customers as traditional search. Both facts are true at once, and together they define the moment: AI is an extraordinary front door and a mediocre cash register.
That should not be surprising. A checkout carries payment credentials, fraud checks, address validation, taxes, returns policy, loyalty logic. A conversation carries intent. Forcing the first through the second stripped away everything merchants have spent two decades optimizing.
Discovery is where the land grab actually is
While in-chat checkout stumbled, the discovery side accelerated. On March 24, 2026, Shopify switched Agentic Storefronts on by default for eligible merchants, making 5.6 million stores discoverable inside ChatGPT, Copilot, Google AI Mode and Gemini. In the first quarter of 2026, AI-referred traffic to US retail sites grew 393% year over year, and those visitors outperform traditional traffic on both conversion rate and revenue per visit. McKinsey projects agentic commerce reaching 3 to 5 trillion dollars by 2030.
Read those numbers together and the strategy writes itself: the shoppers arriving from AI assistants come in smaller numbers than search once sent, but they arrive decided. The competition is no longer for the click. It is for being the answer.
Do not bet the stack on one protocol
Under the surface, the plumbing war is unresolved. ACP from OpenAI and Stripe, Google's UCP, AP2, Visa Trusted Agent, Mastercard Agent Pay: five would-be standards, none dominant. Committing your checkout to any single one in 2026 means rebuilding when the field consolidates. Keeping checkout on your own site sidesteps the question entirely. The protocols can compete over how agents reach you; the transaction stays in infrastructure you control, with your margins, your customer data and your post-purchase relationship intact.
What to do with your store this quarter
Treat "discover in AI, buy on site" as the operating assumption and work both halves:
- Make yourself findable. If you are on Shopify, confirm your store is eligible for Agentic Storefronts and that your product data is complete enough to be recommended. Elsewhere, clean product feeds and structured data are the entry ticket.
- Keep the purchase at home. Resist duplicating checkout inside every assistant. Walmart's three-times-worse conversion inside chat is the cautionary number.
- Measure the new channel separately. AI-referred visitors behave differently from search traffic; if your analytics lumps them together, you cannot see your fastest-growing acquisition channel.
- Revisit quarterly. In-chat checkout will return in better form. When it does, you want the decision to be a calculation, not a scramble.
The companies that win this transition will not be the ones that adopted every protocol first. They will be the ones that made themselves easy for agents to recommend, and kept the sale where it converts.