Universal Commerce Protocol (UCP)
Google coalition protocol for agentic commerce in which merchants publish agent-readable product catalogs with real-time pricing and inventory, surfaced to shoppers through Search AI Mode and Gemini.
Description
UCP is Google's coalition-backed agentic commerce protocol announced in January 2026, coming to Google Search AI Mode and Gemini. Merchants expose machine-readable product catalogs with current price and stock and an agent-ready checkout so a shopper's agent can discover and transact; payment authorization aligns with the AP2 mandate model.
Solution
Commerce protocol. Step 1: the merchant publishes an agent-readable product catalog with real-time pricing and inventory. Step 2: Google Search AI Mode and Gemini surface the catalog to a shopper's agent. Step 3: the agent selects products against the shopper's goal. Step 4: checkout authorises payment through the AP2 mandate model and the order is placed.
Primary use cases
- agent-readable product catalogs surfaced in Search AI Mode and Gemini
- merchant discoverability to shopping agents acting on a goal
- agent checkout with delegated, mandate-backed payment
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