What is Chronary?

Chronary is a calendar API purpose-built for AI agents. It handles calendars, events, availability queries, and sync with human calendar apps — so your agent doesn’t have to.

Who it’s for

• AI agent developers building scheduling, booking, or coordination features
• Teams that need agents to manage calendars across multiple participants
• Any builder who needs calendar infrastructure without the complexity of Google/Outlook OAuth

What you get

Calendar & Event CRUD

Create calendars, manage events, and query across agents with a clean REST API.

Availability Engine

Single-agent and cross-agent availability queries with timezone-aware slot calculation.

iCal Sync

Every calendar gets an .ics feed for Google Calendar, Apple Calendar, and Outlook. Subscribe to external calendars too.

Webhooks

Get notified when events change. HMAC-SHA256 signed, with automatic retries.

MCP Server

9 tools accessible from any MCP-compatible AI client — Claude Desktop, ChatGPT, Cursor.

Free Tier

5 agents, 10 calendars, 50,000 API calls/month. $0 to start.

How it works

Your Agent  →  Chronary API  →  Calendars, Events, Availability
                    ↓
              Human Calendar Apps (via iCal feeds)

Your agent calls the Chronary API (REST or MCP) to create calendars, schedule events, and check availability. Human users see everything in their existing calendar apps via iCal feeds — no app switching required.

Next steps

Quickstart First API call in under 5 minutes

Authentication API keys, test vs live mode

MCP Server Connect to Claude Desktop, ChatGPT, Cursor

API Reference All endpoints documented