> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.cal.id/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Cal ID API Integration

The [Cal ID](https://cal.id/home) API is a REST API that gives you programmatic control of the platform — every resource available to customers is exposed as a simple HTTP endpoint. Create, modify, fetch, or delete an event type; and do the same with bookings, availability, connected calendars, schedules, team memberships, payments, and more — all without ever using the UI.

| API server specifications

* Encode all requests as JSON with the `Content-Type: application/json` header. Responses, including errors, are JSON too.
* HTTP/1, 1.1, and 2 are supported (HTTP/2 preferred).
* TLS 1.2 and 1.3 are supported, with resumption.

The API is organized around REST: predictable, resource-oriented URLs, JSON request bodies and responses, and standard HTTP response codes, authentication, and verbs.

| Base URL

All API requests are made to:

```
https://api.cal.id
```

| Admin API

Some endpoints support **Application Admin API** requests for elevated access. Only **Application Admins** hold the Admin API key — this is not extended to Team Admins.

| Reference

Explore every endpoint in the [API Reference](https://cal.id/docs/api-reference/introduction), with schemas and a live "Try it" playground that runs against `https://api.cal.id`.