How to connect your systeme.io account with ChatGPT using MCP keys

In this article, you will learn how to integrate the systeme.io MCP server with ChatGPT so you can interact with your account data using AI.

What you will need:

A systeme.io account
An MCP key generated from your systeme.io account (How to use the systeme.io MCP server (Model Context Protocol)
A ChatGPT plan or workspace that supports connecting to external MCP servers

Note: Systeme.io does not currently have an official ChatGPT application, and access to the MCP server is in beta mode. Therefore, the server can only be integrated into ChatGPT via its "Developer mode." Depending on your ChatGPT plan and workspace settings, some actions (like create/update/delete) may be restricted or require additional confirmation. See ChatGPT permissions and action restrictions.

1. Enable Developer Mode in ChatGPT

To use custom MCP integrations, you must first enable Developer Mode in your ChatGPT account.

Open ChatGPT and navigate to the Settings (1) menu.

Go to the Apps & Connectors (2) section and scroll down to Advanced settings (2).

Toggle the Developer mode (4) switch to "On".

2. Add the Systeme.io MCP Server

Once Developer Mode is enabled, you can add the Systeme.io MCP server as a new application.

In the Apps & Connectors menu, click the Create app (1) button.

Configure the integration with the following details:

Icon (Optional) (2).
Name (3): Systeme.io
Description (Optional) (4): Systeme.io official MCP server
MCP Server URL (5): https://mcp.systeme.io/mcp?mcpKey=YOUR_KEY Replace YOUR_KEY with your key.
Authentication (6): Select No Auth (as the key is provided in the URL).
Acknowledge the warning by marking the "I understand and want to continue" checkbox (7).
Click Create (8).

3. Usage

After successfully adding the server, you can start using it in your chats.

Create a new chat and enable the added MCP server for your chat.

You can now issue commands to interact with your data. For example: List the last 20 contacts.

4. Managing Contacts

The MCP server allows you to perform CRUD operations on your contacts directly from the chat. Just provide the required details and confirm the action.

a. Create a Contact:

b. Update a Contact:

c. Remove a Contact:

5. Troubleshooting

If the server fails to connect, ensure that:

Your MCP key is valid and not expired, and you correctly provided it to the server.
Developer Mode is active in your ChatGPT settings.