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Protocol

Live means a shopper can use it today, sometimes in one country or at selected stores. An open standard from Google and Shopify so an agent can find products, build a cart, and check out while the store remains the seller.

Note on this rowA protocol release and a shopper-facing buy button are different things. The spec can be live while a particular store's checkout is still a pilot. On October 16, 2026 Shopify said Checkout MCP and Cart MCP support the UCP buyer-consent extension from version 2026-08-25. On October 8, 2026 Newegg said U.S. shoppers can buy eligible products in AI Mode and Gemini with Google Pay. The Shop MCP skill linked from Shopify's October 13, 2026 changelog tells agents to prefer Shop/UCP checkout when it is available. On October 19, 2026 Shoplazza said TikTok Buy Direct uses UCP to connect with merchant systems, and that the brand remains the seller. On October 15, 2026 Google said Universal Cart, powered by UCP, was rolling out in the U.S. in Search and the Gemini app.

Where does this come from?

As of January 11, 2026. Source: Shopify newsroom.

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