ChatGPT setup

Connect ChatGPT to Marketproof MCP.

Add Marketproof as a custom MCP plugin and put NYC real estate data in every chat. Works on ChatGPT Plus and Pro, with workspace paths for Business and Enterprise. New here? Start with the general setup guide to create your account and credentials first.

Grab your credentials

In your Marketproof console, open Connect AI, choose ChatGPT, and pair it with a Connection. The wizard hands you the three values ChatGPT needs, each with a copy button, plus the exact click path for your plan (Individual, Business, or Enterprise):

Server URL: https://mcp.marketproof.com/tools
Client ID and Client Secret for the Connection.

The Connect AI wizard's ChatGPT setup step with plan tabs and copyable Server URL, Client ID, and Client Secret

The wizard's ChatGPT step. Keep this tab open while you switch to ChatGPT.

Plan check: adding a custom MCP plugin requires ChatGPT Plus or Pro on a personal account. On Business, an admin adds and publishes the plugin for the workspace; on Enterprise and Edu, an admin has to allow custom MCP plugins under Workspace Settings first.

Add the plugin in ChatGPT

Now in ChatGPT, in a separate tab:

Open Plugins. Click Plugins in ChatGPT's left sidebar.

ChatGPT's left sidebar with Plugins selected, below New chat, Scheduled, and Library

Add a custom MCP server. Click Add at the top right, then Add custom MCP server.

ChatGPT's Plugins page with the Add menu open, showing Create plugin, Upload plugin archive, and Add custom MCP server

Describe the plugin. Name it Marketproof, set the Connection to the Server URL https://mcp.marketproof.com/tools, and choose OAuth as authentication.

The Add custom MCP server dialog with the name Marketproof, the server URL, and OAuth authentication

Paste your credentials. Expand Advanced OAuth settings, choose User-Defined OAuth Client, paste the Client ID and Client Secret from step 1, check that the token endpoint auth method shows client_secret_post (it switches once the secret is in), tick I understand and want to continue, and click Create as a plugin.

OAuth advanced settings with User-Defined OAuth Client selected, the Client ID and Secret pasted, and client_secret_post as the token endpoint auth method

Install it. Back on the Plugins page, open the Personal tab. Marketproof is listed under Created by you; click the + next to it to install it.

The Personal tab of ChatGPT's Plugins page, with Marketproof under Created by you and its + install button

On a personal Plus or Pro account there's no publish step. On Business, an admin adds the plugin for the workspace and publishes it before members see it.

Use it in a chat

In any conversation, type @Marketproof and pick the plugin from the list. The first time, ChatGPT opens a Marketproof sign-in and consent screen; approve it and the connection is live for your account.

Typing @Marketproof in the ChatGPT message box with the Marketproof plugin suggested

Try it

Ask something concrete to confirm the pipeline end to end:

"@Marketproof What sold in Williamsburg in the last 90 days over $1.5M?"

"@Marketproof Pull the building profile and recent sales for 244 East 41st Street."

To see the kind of finished deliverables agents produce, browse the worked examples.

If something doesn't work

No "Add custom MCP server" option

Custom MCP plugins need ChatGPT Plus or Pro. On Business, Enterprise, or Edu workspaces, an admin has to allow custom MCP plugins and publish them. If you still see a Developer mode switch under Settings → Security and login, turn it on and look again.

Plugin stops responding or tools look stale

Open Marketproof under Plugins in the left sidebar and click Refresh so ChatGPT re-reads the tool list, then re-authorize if prompted.

"Insufficient credits"

Your Marketproof balance hit zero. Top up on the Credits page, or enable auto-recharge.

Lost the Client Secret

Rotate it in the Marketproof console under the Connection, then update the plugin in ChatGPT with the new secret. Contact us if anything else is stuck.

Not set up yet?

Account, credits, and credentials take about five minutes end to end.

Start with the setup guide See pricing