Scheduling
Connect Cal.com to Hypamoon
Yes. Cal.com has a public, versioned API and you create the key yourself, so your chat can write the adapter.
OpenThe check
Three questions about the API of Cal.com, answered from its own docs.
- Public API docs
- Yes. Read the docs
- A key you create yourself
- Yes. Generate an API key in your own settings, or use OAuth. cal.com
- Versions or a changelog
- Yes. API v2 with date versions per endpoint in the cal-api-version header. cal.com
- How it signs in
- API key (prefix cal_) sent as a Bearer token, or OAuth. Every v2 request needs a cal-api-version header.
- Webhooks
- Yes. It can tell your app when something changes. cal.com
- Hosting
- Cloud and self-hosted
What you can build
Look up event types, available slots and bookings, and create or confirm bookings from your chat.
Your chat writes it as a Hypamoon adapter from the docs above. Reading starts after you click Allow in the portal, and every write waits for your approval, one call at a time. How adapters work
Good to know
- Your adapter uses a fixed key: you paste it once in the Hypamoon portal, never in the chat, and it only goes to the API host you allow.
- Self-hosted: your installation must be reachable from the internet over HTTPS, and the API depends on the version you run.
- The right cal-api-version value differs per endpoint; check the endpoint page. API key requests are limited to 120 per minute by default.
Try it in your chat
Fill in what to read and write, and send it.
Build the Hypamoon recipe build-an-adapter for Cal.com. API docs: https://cal.com/docs/api-reference/v2/introduction. Read: [what]. Write: [what, or nothing].
In Claude, or another chat with the full Hypamoon connection; adapters are not in ChatGPT yet. You paste the key in the portal, never in the chat. The full recipe
Sources
Checked on 1 November 2026.
- cal.com/docs/api-reference/v2/introduction
- cal.com/docs/agents
- cal.com/docs/api-reference/v2/v1-v2-differences
- cal.com/help/webhooks
Cal.com is a name of its owner, used here only to describe the software. This page is not an official integration and Hypamoon has no partnership with Cal.com. Found something that changed? Tell us at support.
Tool not listed? Ask the chat to check its API.
The same three checks work for any software. Your chat reads the vendor's own docs and tells you what it found.
Check if [software] has an open API that a Hypamoon adapter can use: public API docs, a key or token I can create myself without asking the vendor, and versions or a changelog. Link the pages you used.
Fill in the name of your software. Checking needs no connection to Hypamoon.
Ready to connect Cal.com?
Connect your chat once, then ask it to build the adapter.
Works in Claude and ChatGPT. Add to Claude Add to ChatGPT