Universal Commerce Protocol (UCP)

An open commerce standard from Google that orchestrates A2A, AP2 and payment rails into one end-to-end agentic-commerce journey.

term

Universal Commerce Protocol (UCP)

category

commerce

short_def

An open commerce standard from Google that orchestrates A2A, AP2 and payment rails into one end-to-end agentic-commerce journey.

long_def

UCP defines a common language and functional primitives so consumer surfaces, businesses and payment providers can transact through agents. Developed by Google with retail partners including Shopify, Etsy, Wayfair, Target and Walmart, it composes existing protocols — A2A for agent communication and AP2 for payment mandates — rather than replacing them.

see_also

agentic-commerce ap2 a2a

etymology_origin

Introduced by Google as the Universal Commerce Protocol, developed with retail partners (Shopify, Etsy, Wayfair, Target, Walmart); composes A2A and AP2.

related_to

agentic-commerce ap2 a2a acp

contrast_with

Unlike AP2 or x402, which each handle one slice (authorization, settlement), UCP is the orchestration layer that strings discovery, agent messaging and payment together into a single commerce journey.

example

Google's Universal Commerce Protocol orchestrates A2A and AP2, with launch partners including Shopify, Etsy, Wayfair, Target and Walmart.

source

https://developers.googleblog.com/under-the-hood-universal-commerce-protocol-ucp/

status

emerging

why_it_matters

UCP is the highest-level commerce framework a retailer can adopt to be transactable by agents end-to-end; it bundles the identity, messaging and payment standards into one journey.

sameAs

—

bridge_entity

protocols/payments/ucp

last_verified

2026-06-15

md_twin

/glossary/ucp.md

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