Create a Custom GPT with MintMCP

Build a Custom GPT that connects to MCP servers through MintMCP.

Prerequisites

• ChatGPT Plus, Pro, Team, or Enterprise account
• A MintMCP account with access to at least one MCP server

Get your API details

1. Go to MCP store in MintMCP
2. Click the MCP server you want to use
3. Go to the Custom GPT tab
4. Choose your authentication method:

Method	Best for
API Key	Personal use, simple setup
OAuth	Sharing with teammates, per-user attribution

Create the Custom GPT

1. Go to ChatGPT GPT Editor
2. Configure the basics:
   • Name: e.g., "Google Workspace Assistant"
   • Description: What this GPT does
   • Instructions: How to use the MCP tools

Configure actions

1. In the GPT Builder, go to Configure
2. Click Create new action
3. Paste the OpenAPI schema from MintMCP

API key authentication

1. Set Authentication Type to API Key
2. Set Auth Type to Bearer
3. Paste the API key from MintMCP

OAuth authentication

1. Set Authentication Type to OAuth
2. Copy these values from MintMCP:
   • Client ID
   • Client Secret
   • Authorization URL
   • Token URL
3. Set Scope to offline_access
4. Set Token Exchange Method to Basic Authorization Header

5. After saving, copy the Callback URL from ChatGPT
6. Paste it in MintMCP's Custom GPT tab and click Submit

Test and publish

1. Use the Preview panel to test your GPT
2. Verify the tools work as expected
3. Click Create and choose sharing settings:

Account type	Sharing options
Team/Enterprise	Invite only, Organization, Public
Plus/Pro	Only me, Anyone with link, Public

API key vs OAuth

Choose API key when...	Choose OAuth when...
Personal use only	Sharing with teammates
Simple setup preferred	Need per-user attribution
All activity attributed to you is fine	Each user needs their own permissions