Definition
The Universal Commerce Protocol is Google's open standard for agentic commerce, letting merchants sell through Google's AI surfaces like AI Mode and the Gemini app. It is the main alternative to OpenAI's Agentic Commerce Protocol.
On this page
At a glance
- Categories Commerce
- Abbreviation UCP
- Related fields Commerce, Technical
- Difficulty Intermediate
What UCP is
UCP plays the same role on Google's side that ACP plays on OpenAI's: a structured way for AI agents to read product catalogs and complete checkout. It powers native purchasing through AI Mode in Google Search and the Gemini app, with partners and platforms onboarding merchants. If ACP is how you sell inside ChatGPT, UCP is how you sell inside Google's AI.
Why there are two, or more
The big platforms each want their own commerce rails, so we are heading into a multi-protocol world rather than one universal standard, despite the name. Most observers expect brands to support both UCP and ACP, the way they already run both Google and Meta ads. Betting on one and ignoring the other means being unreachable in whichever AI your customer happens to open.
What brands should do
Support the major protocols where your platform allows, and lean on your commerce platform to do the heavy lifting, since providers like Shopify and others are building this in. Keep the same foundations clean underneath both: complete structured product data, real-time inventory and pricing, reliable fulfillment. The protocol is the pipe; your data and operations are what actually get you chosen once you are connected.
Frequently Asked Questions
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How is UCP different from ACP?
Same purpose, different camp. UCP is Google's standard for its AI surfaces. ACP is OpenAI and Stripe's for ChatGPT. Most brands will support both.
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Do I have to choose between UCP and ACP?
Generally no. The expectation is dual support, since they reach different audiences across Google's AI and ChatGPT.
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Who is behind UCP?
Google, as its open standard for agentic commerce across surfaces like AI Mode and the Gemini app.