The Schedly Scheduling API
Build professional scheduling capabilities into any application, AI assistant, or automation workflow with Schedly's REST API — complete with webhooks, OAuth, and full booking lifecycle management.
Schedly's API gives developers programmatic access to the full Schedly scheduling platform: availability checking, booking creation, event type management, cancellation, rescheduling, and webhook delivery for real-time booking events. Whether you are building a customer-facing booking flow into your SaaS product, adding scheduling tools to an AI assistant, automating appointment management in an internal tool, or connecting scheduling data to your data warehouse, the Schedly API provides the infrastructure layer. No scheduling engine to build, no calendar sync logic to write, no reminder system to maintain — Schedly handles all of it, and you interact through a clean REST interface.
The results speak for themselves
Up and running in minutes
No technical setup. No developer required. Fully automated from day one.
Generate your API key from Schedly settings
Navigate to Settings → API in your Schedly account and generate an API key with the appropriate permission scopes: read-only availability, booking creation, or full management. Keys are created instantly and can be rotated or revoked at any time.
Query available slots for your event types
Call the /availability endpoint with your event type ID, date range, and optional attendee email for personalized availability. The endpoint returns time slots that satisfy all your booking rules — buffer times, lead times, routing — in your preferred time zone.
Create bookings with a single POST request
POST to /bookings with the selected time slot, attendee details, and any intake form responses. Schedly validates the booking, creates the calendar event, sends confirmation emails, schedules reminders, and returns the booking object with all confirmation details.
Receive real-time events via webhooks
Configure webhook endpoints in your Schedly account to receive HTTP POST notifications for every booking lifecycle event. Process webhook payloads to trigger downstream workflows — CRM updates, Slack notifications, database writes — in real time without polling.
Everything built in. Nothing bolted on.
Every capability works together as a unified system — not a collection of disconnected features.
Availability API
The /availability endpoint returns available booking slots for any event type across any date range, in any time zone, with optional attendee-specific overrides. The availability calculation respects all configured rules: working hours, buffer times, lead time minimums, existing bookings, and connected calendar events.
Booking Management API
Create, retrieve, update, cancel, and reschedule bookings through the /bookings endpoints. Each operation triggers the full Schedly workflow: calendar sync, email notifications, reminder management, and webhook delivery. API-created bookings are indistinguishable from bookings created through the web interface.
Event Types API
List and retrieve event type configurations through the /event-types endpoints — including duration, availability rules, intake form schema, routing logic, and pricing configuration. Use event type data to build dynamic booking UIs that reflect your exact Schedly configuration.
Webhook Delivery System
Configure webhook endpoints for booking.created, booking.confirmed, booking.cancelled, booking.rescheduled, and booking.no_show events. Webhooks are delivered with HMAC signature verification for security, with automatic retry on delivery failure and a delivery log accessible through the Schedly dashboard.
OAuth 2.0 for Multi-Account Applications
Applications that need to access multiple Schedly accounts (scheduling software built on top of Schedly, agency tools managing client accounts) can use OAuth 2.0 to request user-authorized access. Users connect their Schedly account through a standard OAuth flow, and your application receives a scoped access token.
Team Scheduling API
The Schedly Teams API provides endpoints for team availability, round-robin assignment, and team member management. Check availability across an entire team, create bookings with automatic routing, and manage team member schedules programmatically.
Works for every service business
See how different industries apply AI scheduling to their specific workflows — and the results they get.
SaaS products add in-app scheduling for demos, onboarding calls, and customer success meetings using Schedly's API — avoiding the need to build scheduling infrastructure internally
Developers building AI assistants and GPT-powered products add scheduling as a callable tool via Schedly's REST API — enabling their AI to book real appointments as part of conversation workflows
Digital agencies and software consultancies build white-label scheduling products on top of Schedly's API — delivering custom booking experiences to their clients with Schedly as the infrastructure layer
No-code tool developers add Schedly as a native integration in their platforms via REST API, giving non-technical users access to professional scheduling capabilities through visual workflow builders
Enterprise engineering teams build internal scheduling tools and HR workflows on Schedly's API — integrating scheduling with internal systems like HRIS, ticketing, and data warehouses that no off-the-shelf integration covers
Before vs. After AI Scheduling
The operational reality that changes the moment you go live.
- Phone tag and email back-and-forth for every booking
- 19%+ no-show rate with no systematic prevention
- Manual reminder calls consuming staff time every morning
- After-hours booking requests sent to voicemail
- Double-bookings from manual calendar management
- No data on booking patterns or no-show causes
- One link replaces all scheduling coordination — forever
- No-show rate drops to under 5% with three-touch reminders
- AI sends every reminder automatically — zero staff time
- 24/7 booking captures every after-hours lead instantly
- Zero double-bookings with real-time calendar intelligence
- Full analytics dashboard showing every booking pattern
Frequently asked questions
Schedly's REST API is language-agnostic and works with any programming language that can make HTTP requests: JavaScript/Node.js, Python, Ruby, Go, Java, PHP, .NET, and any other. Schedly publishes OpenAPI specifications that can generate typed client libraries for major languages.
All Schedly API timestamps use ISO 8601 format with UTC offset. The availability endpoint accepts a timezone parameter and returns available slots in the requested time zone. Booking creation accepts the slot time in any valid time zone and Schedly normalizes to the host's configured time zone.
API rate limits vary by plan. Pro accounts receive generous rate limits suitable for most production applications. Enterprise accounts have elevated or custom rate limits available for high-volume deployments. Rate limit headers are returned with every API response so your application can implement appropriate backoff.
Yes. Developers can build fully custom booking UIs using Schedly's API endpoints — calling /availability to populate a calendar, rendering custom date and time selection UI, and creating bookings via POST /bookings. Schedly also provides an embeddable JavaScript widget for standard booking flows that do not require custom UI.
Schedly provides a sandbox environment with test API keys that creates bookings in an isolated environment. Sandbox bookings do not send real emails, do not sync to calendars, and do not count against production quotas. Use the sandbox for development and integration testing before switching to production credentials.
Building on the Schedly API: Architecture Guide for Developers
The decision to build scheduling functionality on an API rather than developing it internally is one of the most impactful architectural decisions a product team can make. Scheduling sounds deceptively simple — show available times, create a booking — but the full complexity emerges quickly: real-time calendar sync with multiple providers, time zone handling across international users, buffer time calculation, routing logic for teams, multi-touch reminder sequences, payment integration, webhook reliability for downstream systems, and HIPAA/GDPR compliance for regulated industries. Building all of this from scratch is 6-18 months of engineering investment for a feature that is not your core product. Schedly's API provides all of it as infrastructure, so your team can focus on building the product layer that differentiates you.
API Integration Patterns for Common Use Cases
The most common Schedly API integration pattern is: query /availability with your event type and date range, render the available slots in your UI, receive the user's slot selection, POST to /bookings with the selected slot and attendee details, handle the booking confirmation in your application, and configure webhooks to receive real-time booking events for downstream processing. This pattern works for the vast majority of embedded booking use cases — in-app demo booking, customer onboarding call scheduling, service appointment booking — and can be implemented in a day or two of development time. The second common pattern is event-driven: configure webhooks to receive booking lifecycle events and process them in your application — updating CRM records, triggering Slack notifications, creating project tasks — without polling for booking data.
The API as AI Scheduling Infrastructure
The growth of AI assistant integrations has added a third primary use pattern for the Schedly API: AI tool use. When you define Schedly's availability and booking endpoints as tools in an OpenAI function call, as an MCP server, or as a GPT Action, you are using the same REST API that powers web integrations — but now the caller is an AI model rather than a human user. This convergence of traditional API integration and AI tool use means that the same Schedly API integration that powers your web booking flow can simultaneously power your AI assistant's scheduling capabilities. One API, two interfaces — the structured web UI and the conversational AI interface — both backed by the same production scheduling infrastructure.
Start building with the Schedly API — generate your API key from any paid account.
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