Universal Commerce Protocol
An open standard for integrating commerce with agents, forged from billions of transactions and supported by millions of merchants.
Developed by
One protocol, infinite possibilities
Commerce is complex. UCP provides the core capabilities for what’s common and extensions for everything else.
Universal primitives
Built for interoperability, with the foundations every transaction needs like dynamic negotiation and versioning.
Standardized operations
Proven commerce workflows like product discovery, checkout, orders & post-purchase are ready to use.
Custom extensions
Capability extensions support customization for everything from discounts to fulfillment rules and even embedded checkout.
Never miss the sale
UCP is built for the real use cases of commerce like discounts, loyalty programs, subscriptions and more. Customers demand accurate pricing, fulfillment options and terms in the moment they are ready to checkout - and UCP supports it all.
Antifragile for an evolving world
Commerce is always evolving with new discovery surfaces, payment methods, regulations and business models. UCP flexes to all shapes of commerce.
Dynamic negotiation
Dynamic negotiation
Merchants and agents declare the commerce capabilities they support. The protocol negotiates the difference. No integration meetings required.
Open payments
Open payments
Any payment processor, any wallet. Payment handlers are negotiated, not prescribed. Shop Pay is built-in.
Any transport
Any transport
REST, GQL, JSON-RPC, A2A, MCP—swap the transport and envelope, not the business logic
See it in action
Walk through a complete checkout flow and see exactly what data is exchanged at each step.
Agents and customers, working together
UCP supports seamless escalations for any workflow that needs a human in the loop.
Every transaction finds a path to completion with dynamic handoff based on cart and checkout context.
Every transaction finds a path to completion with dynamic handoff based on cart and checkout context.
Embedded Commerce Protocol
Born from Checkout Kit, distilled into an open protocol, ECP enables agents to render a merchant’s checkout as an embedded experience.
With support for business critical UI extensions, with bidirectional messaging and delegation support for payment and address selection and agent branding ensures a unified user experience that doesn’t feel disjointed.
With support for business critical UI extensions, with bidirectional messaging and delegation support for payment and address selection and agent branding ensures a unified user experience that doesn’t feel disjointed.
The universal protocol
for commerce
Co-developed with Google, open to everyone.