TokenLab OpenAI Apps Model Explorer

Lightweight TokenLab Model Explorer prototype for ChatGPT/OpenAI Apps SDK. It exposes an MCP Streamable HTTP endpoint plus an interactive MCP Apps widget for:

• browsing TokenLab models from /models.json

• comparing pricing from /pricing.json

• generating copyable examples for Chat Completions, Responses, Anthropic Messages, and Gemini generateContent

This repository is intentionally small so it can be used as a public discoverability asset and a starting point for a hosted ChatGPT app.

Live MCP endpoint: https://tokenlab-model-explorer.vercel.app/mcp

Run locally

npm install
npm test
npm start

The server listens on http://localhost:8000.

• MCP endpoint: http://localhost:8000/mcp

• Widget preview: http://localhost:8000/widget

For ChatGPT local testing, expose the MCP endpoint with a tunnel such as ngrok, then add the /mcp URL as a connector in ChatGPT developer mode.

The Express app is also exported as the default module, so Vercel can deploy this repository without a custom adapter.

Related MCP server: OpenRouter MCP Server

Environment

TOKENLAB_API_BASE=https://api.tokenlab.sh
PORT=8000

Tools

Discovery inputs

• https://api.tokenlab.sh/models.json

• https://api.tokenlab.sh/pricing.json

• https://api.tokenlab.sh/integrations.json

• https://docs.tokenlab.sh/openapi.json

Notes

• This app does not require a TokenLab API key for discovery tools.

• Inference tools should use @tokenlab/mcp-server; this repo focuses on model exploration and endpoint examples.

• The widget follows the MCP Apps pattern: tools are registered with UI metadata, and the HTML resource is served as an MCP app resource.