What is Universal Commerce Protocol?
The shift to agentic commerce
The way people shop is moving into AI. Discovery, comparison, checkout, and even post-purchase monitoring increasingly happen inside AI assistants rather than on a search results page or a brand's own site. This isn't a fringe behavior: 73% of consumers are already using AI in their shopping journey. And the money is following — Accenture estimates that by 2030, more than 30% of online commerce will run through AI agents, close to $3.1 trillion in transactions.
From scraping to brand-controlled protocols
Until now, AI assistants learned about products by scraping the open web – guessing at prices, availability, and specs from whatever pages they could read.
That era is ending.
Brands and the platforms behind these assistants are converging on agentic-commerce protocols: structured, brand-published feeds and endpoints that tell an AI exactly what you sell, what it costs, whether it's in stock, and how to complete a purchase. The difference is control – the brand, not a scraper, becomes the source of truth.
The catch is pace. Several of these protocols have emerged in just the last year, each backed by different platforms, and they ship new releases frequently. Staying compliant is an ongoing commitment, not a one-time integration. And each protocol takes a different approach.
What is UCP?
The Universal Commerce Protocol (UCP) is an open standard for letting AI agents and the platforms behind them interact with a brand's commerce systems without custom, one-off integrations. To quote the UCP spec, it is "the common language for platforms, agents, and businesses."
UCP is an open-source project under the Apache 2.0 license, co-developed primarily by Google and Shopify.
What becomes possible
UCP standardizes the building blocks of a commerce journey so any compliant agent can use them. That includes catalog search and product lookup, cart building and unified checkout transactions (with support for tax and complex pricing logic), OAuth 2.0 identity linking so a platform can act on a shopper's behalf, plus order management with real-time webhook-based lifecycle updates, and secure payment token exchange between platforms and payment providers. Because the protocol is transport-agnostic, the same capabilities can be delivered over REST, MCP, or A2A.
Who's behind it
UCP is unusually broad in its backing – including Google, Shopify, Microsoft, Amazon, Walmart, Target, and Stripe for shopping, Booking.com, Expedia Group, and Marriott for lodging, and DoorDash, Square, and Uber Eats for food – with dozens more endorsing the protocol across the ecosystem. The spec is actively expanding into new verticals such as travel and services.
Where it fits
UCP is one of several agentic-commerce protocols converging on the same goal from different angles, and like the others it ships new releases on a fast cadence. Supporting it is how you become the source of truth an agent quotes instead of leaving your products to be inferred from scraped pages.
You can run a completely free check to see how your brand measures up against the published UCP spec right now. And if you'd rather skip the technical implementation entirely, CorgiMaps connects to your existing data to generate a compliant UCP surface and keep it current as the spec changes – with no changes to your fulfillment stack or operations.