> ## Documentation Index > Fetch the complete documentation index at: https://docs.baselayer.com/llms.txt > Use this file to discover all available pages before exploring further. # ChatGPT > Connect Baselayer to ChatGPT and run business verification from a chat. You sign in with your Baselayer account, so you don't need an API key. > [!NOTE] > > You need a Baselayer account with an active plan. If you do not have one, the sign-in page links to [self-serve sign-up](https://console.baselayer.com/signup). > > Custom connectors in ChatGPT require Developer mode, which is available on Plus, Pro, Business, Enterprise, and Edu plans. Turn it on in ChatGPT's settings **before** you add the connector. > > On Business, Enterprise, and Edu workspaces an admin must enable connectors for members. | Setting | Value | | - | - | | **Server URL** | `https://api.baselayer.com/mcp` | | **Authentication** | OAuth (sign in with your Baselayer account) | ## ChatGPT Desktop & Web ### Entry point > [!WARNING] > > Make sure Developer mode is on before you continue. * ChatGPT web ([chatgpt.com](https://chatgpt.com)): open **Plugins** from the left sidebar, then click **+ New Plugin**. * ChatGPT Desktop: you can't create or configure MCP plugins here. Set up the Baselayer plugin on the web, and it then works in the desktop app too. ### Add Baselayer as a connector 1. Open **Plugins** from the left sidebar, then click **+ New Plugin**. Don't use the "Connect to a custom MCP" quick-add form on the separate MCPs tab. It only supports Bearer-token or header authentication and has no OAuth fields, so it won't work for this integration. 2. Fill in the form: | Field | Value | | - | - | | Name | Baselayer | | Description | Search and verify businesses with Baselayer | | Connection | Server URL | | | `https://api.baselayer.com/mcp` | | Authentication | OAuth | 3. Expand **Advanced OAuth settings**. 4. Under **Registration method**, select **User-Defined OAuth Client**. 5. Enter the following values: | Field | Value | | - | - | | OAuth Client ID | chatgpt-connector | | OAuth Client Secret | (leave empty) | | Token endpoint auth method | none | 6. Leave the remaining advanced OAuth settings unchanged. 7. Check **I understand and want to continue**. 8. Click **Create**. 9. In the popup, click **Sign in with Baselayer**. 10. Sign in with your Baselayer credentials. If you do not have an account, use the **Sign up** link on that page. 11. Click **Allow** on the consent screen ("Search and verify businesses with Baselayer on your behalf"). The browser returns you to the Baselayer plugin's detail page, showing it connected with its tools listed. Click **Try in chat** to start a new conversation with Baselayer enabled and try it with one of the **Example prompts** below. ### Remove Baselayer as a connector To sign out without deleting your configuration, open **Plugins**, find **Baselayer**, click the **'⋯'** menu, and choose **Disconnect**. This revokes your session but keeps the connector's configuration. To remove the connector entirely (required before you can change the Registration method or other stored OAuth settings), use the same **'⋯'** menu and choose **Manage** instead. This opens the plugin's settings page. Click the **'⋯'** menu there and choose **Delete**. ## Codex CLI Codex CLI is not supported. It registers with the identity provider in a way Baselayer's provider does not accept. For terminal workflows, use [Claude Code](https://docs.baselayer.com/docs/claude.md#claude-code). ## Example prompts * "Verify Acme Holdings LLC at 500 Main St, Austin TX 78701 and tell me whether the EIN 12-3456789 matches." * "Run a full KYB on Acme Holdings LLC with website analysis and industry classification, then summarize the risk signals." * "Screen Jane Doe against OFAC and PEP." * "Check for UCC filings, tax liens, litigation, and bankruptcies against Acme Holdings LLC in Texas." * "Find Ray's Famous Pizza's website and social profiles and summarize what customers say in reviews." ChatGPT chooses the right tool from the [tool list](https://docs.baselayer.com/docs/mcp-tools.md). Tools that start paid work, such as a new search, ask for your confirmation before running unless you approve them for the conversation; read tools run without a prompt. ## Organization and application ChatGPT does not let you attach headers to a connector, so tool calls always run in your default organization's production application. If you belong to several organizations, or want sandbox data, use [Claude Code](https://docs.baselayer.com/docs/claude.md#claude-code) or the REST API instead. ## Troubleshooting If you see "Your admin has not enabled developer mode" and the Developer mode toggle is greyed out, your ChatGPT workspace is on Business, Enterprise, or Edu, and a workspace admin has not turned on Developer mode for members yet. You cannot enable this yourself. Ask your workspace admin to turn it on, then return to Settings → Security and login. If you get "Client not found" or a login error after entering the URL, the OAuth Client ID was mistyped, or something was entered in the Client Secret field. That field must stay empty. Re-enter Client ID `chatgpt-connector` exactly and leave Client Secret blank. If the Baselayer sign-in page says "We are sorry... Client Metadata fetch failed", go back and check that the Connection URL and Authentication method from step 2 are correct. Then open the plugin's Advanced OAuth settings and set Registration method to User-Defined OAuth Client with Client ID chatgpt-connector, secret blank, and Token endpoint auth method none, as described above. If sign-in completes but the connector shows an error, your account must belong to an organization with at least one enabled application. Sign in to the [Console](https://console.baselayer.com) to confirm, then reconnect. If a tool returns "Caller lacks the required permission", your role does not include that product. The [permissions table](https://docs.baselayer.com/docs/mcp-tools.md#permissions) names the permission each tool needs; an organization admin can grant it in the Console under Members. For anything else, email [support@baselayer.com](mailto:support@baselayer.com). This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.