 Flight, hotel, and destination content APIs with self-serve keys and a free test environment | flights+3 | — | — | api-key, Merchants | 4/5 | | |
 Open-source scheduling with a documented API for availability lookups and booking meetings llms.txt | scheduling+3 | llms.txt | — | api-key, Merchants | 4/5 | | |
 Flights, stays, and ancillaries — search, book, pay, and manage orders from one travel API OpenAPI | travel+3 | OpenAPI | — | api-key, Merchants | 4/5 | | |
 Send physical mail and postcards over an API, payable per item over MPP OpenAPIllms.txt | mail+3 | OpenAPI+1 | MPP | api-key, Merchants | 4/5 | | |
 Universal commerce API for agent-initiated purchases across Shopify and major retailers OpenAPI | purchasing+3 | OpenAPI | ACP | api-key, Merchants | 4/5 | | |
 Purchasing API that places, tracks, and returns orders at Amazon, Walmart, Target, and Best Buy on behalf of agents OpenAPI | purchasing+3 | OpenAPI | — | api-key, Merchants | 4/5 | | |
 Agentic checkout that makes any digital surface shoppable while the merchant stays merchant of record OpenAPI | checkout+3 | OpenAPI | ACP | api-key, Merchants | 3/5 | | |
 Pay-later and payment methods wired into agentic checkout, an early UCP adopter OpenAPIllms.txt | payments+3 | OpenAPI+1 | UCP | api-key, Merchants | 3/5 | | |
 Domain registration, transfers, and DNS management over API OpenAPI | domains+2 | OpenAPI | — | api-key, Merchants | 3/5 | | |
 Print-on-demand production and fulfillment over a REST API OpenAPIllms.txt | print-on-demand+2 | OpenAPI+1 | — | api-key, Merchants | 3/5 | | |
 New York sandwich shop that accepts agent-initiated orders and pays out over MPP | food+2 | — | MPP | api-key, Merchants | 3/5 | | |
 Event, venue, and attraction inventory over a read-only REST API with self-serve keys | events+3 | — | — | api-key, Merchants | 3/5 | | |
 Retail catalog and fulfillment reachable to agents through UCP-aligned commerce surfaces OpenAPI | retail+3 | OpenAPI | UCP | api-key, Merchants | 3/5 | | |
 Big-box retail inventory participating in UCP agentic shopping journeys llms.txt | retail+2 | llms.txt | UCP | api-key, Merchants | 2/5 | | |
 Home goods catalog participating in UCP agentic shopping journeys | retail+2 | — | UCP | api-key, Merchants | 2/5 | | |