Setup guide
Connect ChatGPT to Lumenbase
ChatGPT connects to the same Lumenbase MCP server, with the same OAuth sign-in. Add it as a custom MCP server in ChatGPT on the web.
How do you connect ChatGPT to your CRM?
In ChatGPT on the web, open Plugins, select +, then Add custom MCP server. Name it Lumenbase, enter https://lumenbase.io/api/mcp as the server URL and set authentication to OAuth. Accept the warning, select Create as a plugin, then sign in to Lumenbase and allow access.
Before you start
- ChatGPT on the web. Custom MCP servers depend on your ChatGPT plan and workspace permissions.
- On Business, Enterprise and Edu workspaces, an admin may need to allow this or publish the app for you.
- A Lumenbase plan that includes Lumo, and a full seat.
Add Lumenbase to ChatGPT
Open Plugins
In ChatGPT, open Plugins, select +, then Add custom MCP server. If you do not see it, your account may need Developer mode turned on in Settings first.
Enter the server
Name it Lumenbase, paste the server URL and set Authentication to OAuth.
Create
Review the warning, select I understand and want to continue, then Create as a plugin.
Sign in
Sign in to Lumenbase, check the workspace, then Allow access.
https://lumenbase.io/api/mcp
Use it in a chat
Start a new chat, type @ and pick Lumenbase, then ask: List my open deals. Do not change anything.
ChatGPT asks you to confirm write actions by default. Lumenbase marks its read tools as read-only, so you confirm changes and messages, not lookups.
Common questions
Sources and scope
Steps checked against OpenAI's documentation on 13 November 2026. OpenAI renames these menus from time to time; its documentation has the current labels.
Claude is a trademark of Anthropic. ChatGPT is a trademark of OpenAI. Cursor is a trademark of Anysphere. Lumenbase is not affiliated with, sponsored by or endorsed by these companies.