Zcal
Zcal does not publish a general-purpose public REST API. The only documented programmatic surface is outbound webhooks: Zcal POSTs a JSON payload to a subscriber URL you configure when a booking is created, rescheduled, or cancelled. The single item below is documentation-only and represents the shape of that outbound webhook payload for reference; it is NOT a Zcal-hosted endpoint you can call. Replace the URL with your own webhook receiver to test delivery.
Overview
Zcal is a Open Collection published by Zcal on the APIs.io network, version 1.0.
Zcal does not publish a general-purpose public REST API. The only documented programmatic surface is outbound webhooks: Zcal POSTs a JSON payload to a subscriber URL you configure when a booking is created, rescheduled, or cancelled. The single item below is documentation-only and represents the shape of that outbound webhook payload for reference; it is NOT a Zcal-hosted endpoint you can call. Replace the URL with your own webhook receiver to test delivery.
The collection contains 1 request organised into 1 folder.
Tagged areas include Scheduling, Calendar, Booking, Meetings, and Webhook.
Requests & Folders
Related API Specs
Work with this as data
Every collection here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for collections
4 MCP tools reach this
find_collectionsBrowse and filter every collection in the catalog.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
curl "https://apis.io/api/v1/collections/open-zcal"
curl "https://apis.io/api/v1/collections?limit=25"
Discovery needs no key. Ratings and market analysis are Pro.