Universal Commerce Protocol (UCP)

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

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.

term
Universal Commerce Protocol (UCP)
category
commerce
short_def
An open commerce standard 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. Attributed by secondary reports to Google and retail partners including Shopify, Etsy, Wayfair, Target and Walmart (not confirmed at the primary spec source), 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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