Acuity Scheduling

The API covers appointments, appointment types, availability, clients, and calendars. Agents can create and cancel appointments, check availability, retrieve client records, and manage appointment types programmatically. The webhook system delivers appointment events (new, cancelled, rescheduled) to agent endpoints, enabling event-driven scheduling workflow automation.

Acuity Scheduling (now part of Squarespace) is a widely used appointment scheduling platform for service businesses — therapists, coaches, personal trainers, and other service providers use it for client booking management. The API enables agents to manage appointments, retrieve availability, and sync booking data with other systems. For agents involved in service business automation — managing client scheduling at scale or syncing Acuity with CRMs or billing systems — the API provides the necessary access.

Authentication uses Basic Auth with user ID and API key. The API key is generated from account settings. Teams should treat Acuity API keys as sensitive credentials since they enable booking management operations with direct client-facing consequences.

Documentation covers the API surface with reasonable depth for the available operations. Teams familiar with scheduling API patterns will find Acuity's API straightforward. The webhook documentation is adequate for implementing event-driven booking workflows.

Reliability is appropriate for a production scheduling service processing client-facing appointments. As part of Squarespace, Acuity benefits from enterprise infrastructure. Teams building agent-driven appointment management should implement confirmation workflows — verifying that bookings were created successfully before communicating confirmation to clients.