UCP: An open-source protocol by Google and partners to power agentic commerce. It ensures secure, seamless shopping across consumer surfaces.

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Universal Commerce Protocol (UCP) is an open-source standard developed by Google and major retailers (Shopify, Walmart, Target, etc.) to enable agentic commerce experiences. It standardizes the full commerce journey—from product discovery to checkout and order management—through a unified abstraction layer. UCP supports multiple integration methods (APIs, A2A, MCP), works with existing payment infrastructure via AP2 protocol, and uses a discovery mechanism where businesses expose capabilities through a standard JSON manifest. The protocol aims to eliminate the N×N integration bottleneck that currently prevents seamless conversational shopping experiences across AI surfaces.

Under the Hood: Universal Commerce Protocol (UCP)