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Connect ChatGPT to Aries so you can use the Aries API (portfolio, market data, orders) from ChatGPT. You create an app in ChatGPT with the Aries MCP server URL and OAuth, add your Client ID in User-Defined OAuth Client settings, then click Connect — your browser opens the Aries OAuth screen where you sign in with your Aries credentials and grant access (same flow as other platforms).

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What you need

  • An Aries account and access to Client Center.
  • Access to ChatGPT with developer mode (or app/connector settings) so you can create and configure apps.

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Step 1: Get your Client ID from Client Center

Create an OAuth client in Client Center and copy your Client ID. You will paste it into ChatGPT in Step 2. Use the same redirect URI as other MCP platforms; you do not need to add any callback URL from ChatGPT into Client Center. Do this first: Create an OAuth client in Client Center. Set the redirect URI to https://mcp.aries.com/auth/callback. Copy your Client ID. You only need to add this Client ID in ChatGPT.

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Step 2: Create the app in ChatGPT and add your Client ID

Create the app in ChatGPT, then in Advanced settings select User-Defined OAuth Client and paste your Client ID. ChatGPT handles the OAuth flow.
  1. Open ChatGPT and go to Settings (or your profile/settings).
  2. Find Apps (or Connectors / Developer). If you need developer mode, enable it in settings so you can create custom apps.
  3. Click Create app or Add to add a new app.
  4. Fill in the app details:
    • Name — e.g. aries (or any name you prefer).
    • MCP Server URL — Enter this exact URL (fixed for all users): 
      https://mcp.aries.com/mcp
    • Authentication — Select OAuth.
  5. Open Advanced settings (expand the section). In OAuth advanced settings:
    • For Registration method, select User-Defined OAuth Client.
    • In OAuth Client ID (Optional), paste your Client ID from Step 1. For Aries, the Client ID is required.
  6. Read the warning about custom MCP servers. Check I understand and want to continue if shown.
  7. Click Create (or Add) to create the app.
Token endpoint auth method — If shown, client_secret_post is typically used. You do not need to change it when using only Client ID.

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Step 3: Click Connect and complete the Aries OAuth screen

Once the app is created, connect it to your Aries account.
  1. In ChatGPT, find your Aries app and click Connect (or the equivalent action to start the connection).
  2. Your browser opens the Aries OAuth screen (sign-in and consent page). This is the same flow as on other platforms (Claude, Cursor, etc.).
  3. Sign in with your Aries email and password.
  4. Review the permissions and click Allow or Approve to grant access.
First-time permission grant: This screen appears only the first time you connect. If you close it without clicking Allow, it may not appear again. Complete sign-in and click Allow or Approve before closing the tab.
After you approve, Aries redirects back to ChatGPT and the token exchange completes. You will see a success message or return to ChatGPT.

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Step 4: You’re connected

ChatGPT is now linked to your Aries account. You can ask in natural language for portfolio info, market data, or to place orders — same as on other platforms. ChatGPT uses the Aries API with the permissions you granted.

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Troubleshooting

IssueWhat to do
”redirect_uri_mismatch”In Client Center, set the OAuth redirect URI to https://mcp.aries.com/auth/callback (same as other MCP platforms).
“invalid_client”Confirm your Client ID is correct and the client is active in Client Center. Ensure you selected User-Defined OAuth Client and pasted the Client ID in the OAuth Client ID field in ChatGPT.
Permission screen didn’t appear or I missed itThe grant screen only appears the first time. Complete sign-in and click Allow before closing the browser tab. If you missed it, remove the app and add it again, then Connect and complete the OAuth screen.
More help: OAuth2 Guide — Troubleshooting.

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Next steps

MCP Authentication

Common steps and all supported platforms.

Claude.ai (Web)

Connect Claude in the browser to Aries.

Cursor

Add Aries MCP server in Cursor.

Claude Desktop

Connect Claude Desktop to Aries.

Perplexity

Connect Perplexity to Aries via MCP.

Microsoft Copilot Studio

Add Aries MCP tool in Copilot Studio.