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Chapter 4

ChatGPT and Codex MCP

Add the Proferex MCP server to ChatGPT and Codex.

In ChatGPT, add Proferex as a custom MCP server under Plugins. In Codex, add the Proferex MCP server from the terminal. Each needs its own connection.

Add the Proferex MCP server in ChatGPT

  1. In ChatGPT, open Plugins, click Add and choose Add custom MCP server.
The ChatGPT Plugins Add menu with Create plugin, Upload plugin archive and Add custom MCP server
Choose Add custom MCP server
  1. Enter Proferex as the name, paste https://www.proferex.com/api/mcp as the server URL, and leave Authentication on OAuth.
The ChatGPT Add custom MCP server form with the name Proferex, the Proferex server URL and OAuth authentication
Fill in the name and the Proferex address
  1. ChatGPT finds the sign-in settings by itself. Open Advanced OAuth settings only to check that both read and write are ticked under Default scopes. Without write, ChatGPT can't propose changes.
ChatGPT Default scopes with read and write both ticked
Keep both read and write ticked
  1. Tick I understand and want to continue, then click Create as a plugin.
  2. Click Connect Proferex. The same Proferex page opens, this time asking Connect ChatGPT to Proferex? Check the account and click Allow access.
ChatGPT asking to Connect Proferex, with Connect Proferex and Cancel buttons
ChatGPT hands you over to Proferex to allow access

To use it, type @Proferex in the message box, pick Proferex from the list, then type your question.

The ChatGPT message box with the Proferex plugin chip added
Type @Proferex to use Proferex in a chat
ChatGPT listing the seven most profitable campaigns of the last 7 days with profit, ROI and conversions
ChatGPT answers from the same Proferex stats

When you ask for a change, ChatGPT shows Awaiting approval with a button such as Approve offer creation. The button opens the approval page in Proferex. After you approve, tell ChatGPT and it checks that the change was made.

ChatGPT showing Awaiting approval for the Summer CPA offer with an Approve offer creation button
ChatGPT links straight to the approval page
ChatGPT confirming Summer CPA was created successfully in Proferex
After you approve, ChatGPT confirms the change

Add the Proferex MCP server in Codex

In a terminal, run:

codex mcp add proferex --url https://www.proferex.com/api/mcp

Codex finds the Proferex sign-in by itself and prints a link. Your browser opens the same Proferex page, asking Connect Codex to Proferex? Click Allow access. When the browser says Authentication complete, close the tab and go back to the terminal.

Start Codex with codex and type /mcp to check that proferex is listed. Then ask your question in the same session.

If the link doesn't open by itself, copy it from the terminal into your browser. To sign in again later, run codex mcp login proferex.

Next step

See Connect Your AI App with MCP for what your AI app can read and change, how to approve its changes in Proferex, and how to disconnect it.