CustomGPT.ai API Authentication

How to authenticate CustomGPT.ai API requests: one Bearer API key plus a connectionId. MindCloud stores your API key securely — set it once, never resend it.

Every CustomGPT.ai API request through MindCloud needs two things: a MindCloud API Key and a connectionId for your CustomGPT.ai account. This page covers both, plus exactly how to send them, so you do not need to visit any other page to get authenticated.

Steps to authenticate

Create a MindCloud account at app.mindcloud.co if you do not already have one.
Generate a MindCloud API Key in API Keys. This is the Bearer token you send on every request. Keep it on your server.
Create a CustomGPT.ai connection in Connections. CustomGPT.ai uses an API key. You generate the key in your CustomGPT.ai account, then paste it in when you create the connection — MindCloud stores it securely and never returns it in a response.
Copy the connection’s connectionId — you will send it on every request alongside your MindCloud API Key.

How requests are authenticated

Authentication has two layers. Your MindCloud API Key authenticates the request to MindCloud, sent as a Bearer token in the Authorization header. The connectionId selects the connected CustomGPT.ai account that should run the action. MindCloud stores and refreshes the CustomGPT.ai credentials behind that connection, so you never send provider tokens with your requests.

Pass connectionId in the query string for GET and DELETE actions, and in the JSON body for POST, PUT, and PATCH actions.

For example, calling Get Current User Profile with an CustomGPT.ai connection looks like this:

curl --request POST \
  --url "https://connect.mindcloud.co/v2/universal/apps/customGPTai/actions/get-current-user-profile/run" \
  --header "Authorization: Bearer $MINDCLOUD_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "connectionId": "$CONNECTION_ID",
  "arguments": {}
}'

The Authorization: Bearer <your MindCloud API Key> header authenticates you to MindCloud; the connectionId tells MindCloud which CustomGPT.ai account to run the action against. Missing or invalid Authorization returns 401, and a missing or mismatched connectionId returns 400.

Connect your CustomGPT.ai API key

You need a CustomGPT.ai account that can sign in at app.customgpt.ai and open the Developers area.

Sign in to CustomGPT.ai
Open the CustomGPT.ai login page and sign in with the account you want MindCloud to use.
CustomGPT.ai → Log In
Open Developers
In the CustomGPT.ai app, open the Developers area where API keys are managed.
Create an API key
Click Create API Key, choose the permissions you want, and keep the first key broad enough for account-level reads such as Get Current User Profile and List Agents.
Copy the API key
Copy the generated API key and keep it secure. Rotate it in CustomGPT.ai if you think it has been exposed.
Paste the key into MindCloud
Return to MindCloud and paste the copied value into the API Key field for this connection.

Keep your key safe

Keep your MindCloud API Key on your server; do not ship it in browser code, mobile apps, public repositories, or logs. Anyone with the key can call the Universal API as your MindCloud account, across every connection you have created.