Work and projects
Connect Mattermost to Hypamoon
Yes. Mattermost 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 Mattermost, answered from its own docs.
- Public API docs
- Yes. Read the docs
- A key you create yourself
- Yes. Use personal access tokens or a bot account on your own Mattermost server. docs.mattermost.com
- Versions or a changelog
- Yes. API v4, described as stable and semver tracked. docs.mattermost.com
- How it signs in
- Personal access token or bot token as a Bearer token.
- Webhooks
- Yes. It can tell your app when something changes. docs.mattermost.com
- Hosting
- Cloud and self-hosted
What you can build
Post an alert in a channel when something happens in another system, and answer questions from a channel with a bot.
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.
- If you host it yourself, the API of your own installation must be reachable over HTTPS from the internet, so the adapter can call it.
Try it in your chat
Fill in what to read and write, and send it.
Build the Hypamoon recipe build-an-adapter for Mattermost. API docs: https://docs.mattermost.com/api. 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 7 November 2026.
Mattermost 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 Mattermost. Found something that changed? Tell us at support.
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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 Mattermost?
Connect your chat once, then ask it to build the adapter.
Works in Claude, ChatGPT and Copilot. Add to Claude Add to ChatGPT 
Add to Copilot