
AI Shopping Agents Are Buying Things Now: A Small Seller's Guide to UCP, ACP, and the 2026 Protocol Land Grab
Four competing agentic commerce protocols — Google's UCP, OpenAI's ACP, Alibaba's trust protocol, and Stripe's MPP — launched within months of each other in early 2026. What small online sellers should actually do about machine-readable catalogs, automatic enrollment, and reconciling revenue across four new checkout channels.









