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Scheduling

Connect Google Calendar to Hypamoon

Yes, with one catch. Google Calendar has an open API that you can use yourself, but it signs in with OAuth only, and that takes more work in a Hypamoon adapter today.

Open

The check

Three questions about the API of Google Calendar, answered from its own docs.

Public API docs
Yes. Read the docs
A key you create yourself
Yes. Create an OAuth client or a service account yourself in your own Google Cloud project; for Workspace, a Super Admin can grant domain-wide delegation. developers.google.com
Versions or a changelog
Yes. Versioned REST API, v3. developers.google.com
How it signs in
OAuth 2.0 with a client from your own Google Cloud project, or a service account with domain-wide delegation in a Workspace domain.
Webhooks
Yes. It can tell your app when something changes. developers.google.com
Hosting
Cloud

Your own booking and planning flow on Google Calendar, with your real free times.

  • Calendars, events and free or busy times, straight from Google Calendar.
  • AI that finds a good slot and prepares each meeting with what it knows.
  • A booking page on your own site and a text message reminder.

Ask your chat

Answers straight from your Google Calendar data, in Claude or another chat with the full Hypamoon connection.

  • When am I free for an hour next week?
  • Which customer meetings are on the calendar tomorrow?

On a schedule

An agent checks Google Calendar every 15 minutes and decides what happens next.

  1. Every 15 minutes

    Every morning at seven.

    AI decides

    AI reads the day's events and adds what you need to know about each guest.

    Then

    You get the agenda with short notes by email.

Add Hypamoon

Text messages, email, phone, payments and agents run in the same project as the adapter.

  • Text message, Netherlands for now

    The day before an appointment, the guest gets a reminder by text message.

  • Phone, Netherlands for now

    Your number is answered by the voice AI, which books a slot in your calendar for you to approve.

    AI proposes, you approve

Google Calendar stays the core: your chat builds the rest on its API, as an adapter plus an app and agents in your Hypamoon project. Reading starts after you click Allow in the portal. Every change an agent or a chat makes in Google Calendar waits for your approval, one call at a time. How adapters work

Good to know

  • Google Calendar signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Google Calendar takes more work: ask your chat to check this first.
  • Part of Google Workspace, which has its own entry; this entry is for people looking for this app on its own. Push channels expire and must be renewed with a new watch call; notifications carry no body, so you fetch the change yourself.

Try it in your chat

Fill in what to read and write, and send it.

Say this in your chat

Build the Hypamoon recipe build-an-adapter for Google Calendar. API docs: https://developers.google.com/workspace/calendar/api/guides/overview. Read: [what]. Write: [what, or nothing].

Open in Claude

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 7 November 2026.

Google Calendar 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 Google Calendar. Found something that changed? Tell us at support.

More in scheduling

All 1094 tools

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.

Say this in your chat

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.

Open in Claude Open in ChatGPT

Fill in the name of your software. Checking needs no connection to Hypamoon.

Ready to connect Google Calendar?

Connect your chat once, then ask it to build the adapter.

Start free

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