Posted by the APIs.io catalog. APIs.io does not own or sell this API; we get access from the provider, Square.
The Square BookingCustomAttributes API is a hosted service with 6 operations for working with booking custom attributes on Square. It sits within Square's wider platform for payment processing, point of sale and business management, and is aimed at developers building custom commerce applications. If you build booking or scheduling tools on Square and need to attach your own data to bookings, this is the part of the platform to look at.
What is published for it: an OpenAPI description, documentation, an API reference, an AsyncAPI description and JSON Schema. The base URL is connect.squareup.com.
Catalog scores: Kin Score 78.1, in the exemplar band. Agent Readiness 62.8, in the agent-native band, scored on 2026-10-23.
Access: the provider lists a freemium model with self-serve signup.
Pricing: set by the provider.
Condition: a live hosted API, listed in the APIs.io catalog. You call the provider's own endpoint.
Catalog listing: https://apis.io/apis/square/square-bookingcustomattributes-api/ Provider: https://www.squareup.com/