Services — the AI agent directory

Services in the directory
Service	Tags	Interfaces	Payments	Auth	Score
Cal.com Open-source scheduling with a documented API for availability lookups and booking meetings llms.txt	scheduling+3	llms.txt	—	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
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
Printful Print-on-demand production and fulfillment over a REST API OpenAPIllms.txt	print-on-demand+2	OpenAPI+1	—	api-key, Merchants	3/5
Target Big-box retail inventory participating in UCP agentic shopping journeys llms.txt	retail+2	llms.txt	UCP	api-key, Merchants	2/5