Services — the AI agent directory

Services in the directory
Service	Tags	Interfaces	Payments	Auth	Score
Duffel Flights, stays, and ancillaries — search, book, pay, and manage orders from one travel API OpenAPI	travel+3	OpenAPI	—	api-key, Merchants	4/5
PostalForm 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
Rye Universal commerce API for agent-initiated purchases across Shopify and major retailers OpenAPI	purchasing+3	OpenAPI	ACP	api-key, Merchants	4/5
Zinc 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
Firmly.ai 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
Klarna 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
Namecheap API Domain registration, transfers, and DNS management over API OpenAPI	domains+2	OpenAPI	—	api-key, Merchants	3/5
Printful Print-on-demand production and fulfillment over a REST API OpenAPIllms.txt	print-on-demand+2	OpenAPI+1	—	api-key, Merchants	3/5
Walmart Retail catalog and fulfillment reachable to agents through UCP-aligned commerce surfaces OpenAPI	retail+3	OpenAPI	UCP	api-key, Merchants	3/5