Universal Commerce Protocol
Universal Commerce Protocol.
The standard for commerce
readable, negotiable, actionable
by AI agents.
Launched by Google and Shopify at NRF 2026, the open standard UCP connects catalogs, cart and payment to AI agents, from AI Mode to Gemini. This hub documents the standard and provides the framework to decide at board level.
The standard
UCP, in four verifiable facts.
Every claim on this hub is sourced and dated. Details, milestones and primary sources live on the standard reference page.
01
An open standard, led by Google and Shopify.
Announced January 11, 2026 at NRF, co-developed with Etsy, Wayfair, Target and Walmart, endorsed by 20+ players (Adyen, American Express, Mastercard, Stripe, Visa...). Public specification on GitHub.
02
Native checkout in AI Mode and Gemini.
Google's reference implementation lets consumers buy directly inside the conversation, with Google Pay. The merchant remains the merchant of record.
03
Rapid expansion since May 2026.
Google Marketing Live 2026: multi-retailer Universal Cart, Affirm and Klarna buy-now-pay-later inside Google Pay, Shopping ads on YouTube, and announced expansion into hotel booking and food delivery.
04
Not the only standard: UCP coexists with ACP.
OpenAI and Stripe push the Agentic Commerce Protocol on the ChatGPT side. Two different philosophies, compared point by point in UCP vs ACP.
The reading framework
Three shifts are happening simultaneously.
01
Product data is no longer optimized solely for humans.
Agents read at machine speed, reason about intent and act on behalf of the buyer. A "well-written" product page is no longer enough: a semantic contract is needed.
02
A protocol layer is missing from the commerce stack.
Between merchant, agent and platform, there is no shared contract for offers, inventory, policies and intent. It is emerging, in fragments, through MCP, schema.org, GS1, Stripe ACP, Visa IC.
03
Merchant readiness becomes the decisive variable.
Platforms will deliver most of the plumbing. Catalog quality, attribute richness and policy clarity remain the operator's responsibility, and that is where the advantage lies.
The framework
Four layers,
one contract.
The UCP framework breaks down the stack into four layers that an operator can map, score and prioritize.
Explore the four layers- I
Semantic Layer
Catalog data becomes machine-addressable.
Product, Offer, Policy, Availability: a stable semantic contract that agents can parse, compare and cite, beyond HTML optimized for Google.
- II
Agent Layer
Agents interact with merchants deterministically.
Typed endpoints, tools exposed via MCP/A2A, action and query surfaces. An agent must be able to read, propose, and confirm.
- III
Transaction Layer
Payment and identity are compatible with a delegated buyer.
Agentic rails (Stripe ACP, Visa Intelligent Commerce...), pre-authorized intents, limits, traceability. Purchasing is no longer a human plus a browser.
- IV
Governance Layer
The operator retains control: rules, consent, audit.
Pricing policies, eligibility, territories, dispute, retention. What the merchant authorizes, refuses, revises, in a readable and versioned manner.
Who this hub is for
For those who make 18-month decisions, not those looking for a weekly hack.
01
E-commerce & retail leaders
CEO, CMO, Chief Digital seeking a stable analytical framework.
02
Commerce platforms & SaaS
PMs and founders who need to position their roadmap against the rise of agents.
03
Innovation teams
Teams tasked with anticipating the reshaping of discovery and checkout.
04
Analysts, funds, media
Observers looking for a usable, credible conceptual framework.
Editorial principles
What sets this hub apart from a generic blog.
The .fr is not a media outlet. News, analysis and long-form resources live on
the editorial outlet .blog. Here,
only: framework, method, application.
- 01 Platform neutrality.
- Neither Stripe, nor Shopify, nor OpenAI. Players are cited on merit.
- 02 Epistemic honesty.
- Every claim is labeled established / emerging / prospective.
- 03 Operational utility.
- The framework translates into decisions that can be made in a strategy meeting.
- 04 Stabilized vocabulary.
- One concept, one translation, reused everywhere.
Get in touch
You own the decision,
we bring the framework.
Readiness audit, UCP framework workshop, research partnership. Three structured formats, designed for executive teams ready to move from philosophical debate to action.
Three formats
Readiness audit
Short, structured diagnosis with written deliverable.
UCP Workshop
Half-day with the executive team.
Observatory
Research partnership and co-publication.