Universal Commerce Protocol (UCP)
UCP standardises agent-driven commerce interactions.
- Category
- Commerce
- Standard
- Emerging checkEmerging
- Off by default, turn on in settings
Who supports it
GeminiSupported (announced)
Published 16 Sept 2026 · last checked 9 Oct 2026: Retailers: Get ready for AI-driven holiday shopping (Google blog)Retailers 'integrate UCP-powered checkout on Google and start selling their products in Search — including AI Mode — and the Gemini app'. Google's UCP developer guide (https://developers.google.com/merchant/ucp, undated) says 'Gemini web (app coming soon)', and Merchant Center help says the feature is available for select merchants only (early access). First announced 2026-01-11: https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/
CopilotPartial support
Published 21 Apr 2026 · last checked 9 Oct 2026: Win across all three eras of the web (Microsoft Advertising blog)Microsoft announced Universal Commerce Protocol support in Microsoft Merchant Center (UCP-ready feeds, GA in US). Its agentic commerce page (https://about.ads.microsoft.com/en/solutions/technology/agentic-commerce, undated) says UCP 'enables transactions (checkout and post-purchase actions within AI experiences like Copilot)'. Marked partial because Microsoft's own launch post says Copilot Checkout runs on ACP, and the UCP support we found is feed-level, so it is unclear whether Copilot transacts over UCP end to end.
25 others: no evidence yet. See every agent and browser
What it checks
UCP aims to give agents one way to browse a catalogue, build a basket, and check out across different merchants.
The extension requests /.well-known/ucp.json and /.well-known/ucp, in that order, and passes on the first one that
returns a non-empty JSON document.
Commerce protocols are new, and most sites have no reason to support them, so absence is N/A rather than a failure.
Results
| Status | When |
|---|---|
| Pass | One of the paths returns a non-empty JSON document |
| N/A | Nothing was found |
How to fix
Publish a UCP business profile at /.well-known/ucp, the path the UCP specification defines, to expose your commerce capabilities to agents. Serve it as JSON (Content-Type: application/json); the extension only
confirms a JSON document is there and does not validate its contents.
These standards are still settling, so follow the protocol’s own documentation for what the descriptor should contain.
Support by agent and browser
Announced means the vendor’s own docs or announcement say so. Published is the date on the vendor’s own page, where it has one. Checked is the last time our weekly research found that page still saying so.
| Agent | Status | Source |
|---|---|---|
| AI assistants | ||
| Gemini Google | Supported (announced) | Retailers: Get ready for AI-driven holiday shopping (Google blog) Published · Checked Retailers 'integrate UCP-powered checkout on Google and start selling their products in Search — including AI Mode — and the Gemini app'. Google's UCP developer guide (https://developers.google.com/merchant/ucp, undated) says 'Gemini web (app coming soon)', and Merchant Center help says the feature is available for select merchants only (early access). First announced 2026-01-11: https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/ |
| Copilot Microsoft | Partial support | partial Win across all three eras of the web (Microsoft Advertising blog) Published · Checked Microsoft announced Universal Commerce Protocol support in Microsoft Merchant Center (UCP-ready feeds, GA in US). Its agentic commerce page (https://about.ads.microsoft.com/en/solutions/technology/agentic-commerce, undated) says UCP 'enables transactions (checkout and post-purchase actions within AI experiences like Copilot)'. Marked partial because Microsoft's own launch post says Copilot Checkout runs on ACP, and the UCP support we found is feed-level, so it is unclear whether Copilot transacts over UCP end to end. |
No evidence yet25
- ChatGPT
- Claude
- Perplexity
- Meta AI
- ChatGPT Atlas
- Comet
- Dia
- Gemini in Chrome
- Edge Copilot Mode
- Claude Code
- Cursor
- Codex
- GitHub Copilot
- Windsurf
- CCBot
- Applebot
- Amazonbot
- Bytespider
- Cohere
- Mistral
- DuckAssist
- Chrome
- Edge
- Firefox
- Safari
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Adoption on the top 100 sites
0 of 91 measured sites implement it
Overview
How this rating is worked out2 of 9 points
| Factor | Points | Why |
|---|---|---|
| Vendor support | 1 / 3 | 1 vendor supporting, 1 partly or planned |
| Top-100 adoption | 0 / 3 | 0% of measured sites |
| Spec maturity | 1 / 3 | Single-vendor spec |
8 or more points is Established, 5 to 7 is Gaining traction, 2 to 4 is Speculative and under 2 is Stalled. A feature is also Stalled when more vendors have said no than yes. Read the spec.
Community insights
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