Universal Commerce Protocol (UCP)
./PayOpen commerce standard from Google and Shopify for agentic shopping journeys across retailers, pairing with AP2 for the payment leg
OpenAPIllms.txtUCP
$ protocol support
$ payment protocols
UCPUniversal Commerce ProtocolGoogle, Shopify · commerce
Open standard for agentic shopping journeys across retailers, pairing with AP2 for the payment leg
$ agent access
authNo Auth
onboardingFull — agent can self-onboard
tosExplicitly welcomes bots
webhooksNo
free tierYes
billingfree
#ucp#protocol#commerce#open-source#google#shopify
https://ucp.dev
// last verified 8/26/2026
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