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Every app connects to the same address, then sends you to Oppin to approve access:
When you approve, you choose the organization. Members with view-only access connect read-only. In Oppin, the MCP tab of the Data & MCP page walks you through the same steps: click Connect Oppin and pick your app.

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Chat apps

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Claude

Every Claude plan, on the web and in the desktop app. The free plan allows one custom connector.
  1. Click Add to Claude. Claude opens with Oppin already filled in. Add to Claude
  2. In Claude, click Add, then Connect.
  3. In Oppin, pick the organization and click Connect.
  4. In any chat, turn on Oppin from the tools menu.
On a Team or Enterprise plan, an owner adds Oppin for everyone, then each person clicks Connect. To add it by hand: open Customize, then Connectors, click Add custom connector and paste https://api.oppin.ai/mcp.

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ChatGPT

Plus, Pro, Business, Enterprise and Edu plans. Set it up on chatgpt.com, not in the Mac app.
  1. On chatgpt.com, open Settings and turn on Developer mode.
  2. Create a new app named Oppin, paste this address, and choose OAuth for authentication.
  3. Click Connect. In Oppin, pick the organization and click Connect.
  4. In a chat, pick Oppin from the tools menu before you ask.
Don’t see Developer mode? On Business, Enterprise and Edu accounts, a workspace admin has to turn it on first. Deep research can only read from Oppin. To change your tracking, use a regular chat.

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Coding tools

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Cursor

Cursor Pro plans and up.
  1. Click Add to Cursor and confirm in Cursor. Add to Cursor
  2. In Cursor’s Tools & MCP settings, sign in to Oppin when it asks. Your browser opens Oppin.
  3. In Oppin, pick the organization and click Connect.
To add it by hand: in Tools & MCP, click New MCP Server and add https://api.oppin.ai/mcp as the server’s url.

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VS Code

Any GitHub Copilot plan, in agent mode. On Copilot Business and Enterprise, an admin has to allow MCP servers first.
  1. Click Add to VS Code and click Install in VS Code. Add to VS Code
  2. The first time Copilot uses Oppin, your browser opens Oppin to sign in.
  3. In Oppin, pick the organization and click Connect.
To add it by hand: run MCP: Add Server from the Command Palette, choose HTTP and paste https://api.oppin.ai/mcp.

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Claude Code

Anyone using Claude Code in the terminal or an IDE.
  1. Run this in your terminal:
  2. Start Claude Code, type /mcp, pick oppin and sign in. Your browser opens Oppin.
  3. In Oppin, pick the organization and click Connect.
--scope user makes Oppin available in every project. Leave it out to add it to the current project only.

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Codex

The Codex CLI and IDE extension, with a paid ChatGPT plan or an OpenAI API key.
  1. Run this in your terminal:
  2. Then sign in. Your browser opens Oppin.
  3. In Oppin, pick the organization and click Connect.
The IDE extension shares this setup, so Oppin shows up there too.

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Any other app

Any app that supports remote MCP servers, for example Perplexity, Mistral Le Chat, Zed, Gemini CLI or Copilot Studio.
  1. Add a custom connector (some apps call it an MCP server) and paste this address:
  2. If the app asks how to sign in, choose OAuth. In Oppin, pick the organization and click Connect.
An app that cannot sign in this way can use an API key instead, sent as a bearer token. Organization admins create keys.