Universal Commerce Protocol (UCP)
Open standard co-developed by Google and Shopify for AI agents to discover, negotiate, and transact with any merchant across the full commerce journey.
Overview
The Universal Commerce Protocol (UCP) is an open-source standard developed by Google in collaboration with Shopify and other partners to standardize the full agentic commerce journey: discovery, consideration, purchase, order management, fulfillment, returns, and loyalty. It defines capability discovery and negotiation between agents and merchants and can compose with REST, MCP, AP2, and A2A. Note: an earlier draft referred to it as 'Universal Checkout Protocol'; the verified official name is 'Universal Commerce Protocol.' It is a Web2-oriented commerce standard.
Sato Score
59/100· MediumHow open, active & verifiable — not a safety or returns grade.
- Maintenance & liveness
- 20/35
- Code transparency
- 8/20
- Interface verifiability
- 0/10
- Docs & demo
- 10/10
- Listing transparency & provenance
- 13/15
- Independent verification
- 8/10
Independently verified — listing reviewed against evidence, never self-reported.
Observed record — 57 daily checks since 2026-07-14
- Succeeded
- 57
- Failed
- 0
- Their error
- 0
- Unattributed
- 0
This is the share of our daily checks that succeeded — not an availability guarantee. A check can fail because the host was down, because our runner timed out, or because the network in between dropped it, and only the first of those is a fact about this project. Failures are split by what we can attribute; anything we cannot attribute is counted, not hidden. 49 of these checks predate 2026-09-01, when the probe counted a bot-block (HTTP 403) as a failure and recorded no reason for any failure. Rates spanning that date mix two definitions. Since then: 100%.
Details
- Chains
- Unknown
- Agent types
- Commerce Agent, Payment Protocol
- Open source
- Yes
- Pricing
- Free (open standard)
- Deploys as
- API, MCP serverfrom project docs · 2026-06-25
- Works with
- AP2, A2A, MCP, Shop Pay, Google Payfrom project docs · 2026-06-25
- Last checked
- 2026-09-08
Marketplace Signals
- ▸ Demo available
Verification status reflects evidence reviewed by Sato Hub. Self-reported claims are never presented as verified.
Where Universal Commerce Protocol (UCP) fits
Related concepts: How Agents Interact With Smart Contracts, How Agents Use Wallets, What Are Onchain Agents?
Listing History
Recorded changes to Universal Commerce Protocol (UCP)'s listing — status, verification, Sato Score, and recent releases. Full history is kept in the listing record.
- Jun 25, 2026Enriched: deployment options, has demo, marketplace notes
- Jun 25, 2026Auto-enriched: supported integrations, creator name
- Jun 25, 2026Sato Score tier: Low → MediumScore 39 → 54.
- Jun 11, 2026Sato Hub began tracking this listing
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Is this your project?
Prove you control the domain and you can correct this page — description, links, tags, chains. Claiming proves control, not verification: it doesn't change the Sato Score or mark anything as audited.
Claim this listing →Cite this page
Sato Hub. "Universal Commerce Protocol (UCP) — Sato Hub." Sato Hub, updated 2026-09-08, accessed 2026-09-08. https://satohub.ai/resources/universal-commerce-protocol-ucpThis page is refreshed daily. Citations include the date so a reader can tell which snapshot a claim came from.
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