justetf-mcp

A local Model Context Protocol (MCP) server for read-only justETF data.

This server wraps the third-party druzsan/justetf-scraping Python scraper and exposes a compact MCP tool surface for ETF search, profiles, charts, comparisons, and live quotes.

Caveat: justETF does not publish a stable public API for these endpoints. The upstream scraper relies on justETF web-app endpoints/page structure, so tools can break if justETF changes its site. Use conservative request volumes and review justETF terms for your use case. This is not investment advice.

Tools

• search_etfs — query the justETF screener with filters and pagination.

• get_etf_profile — profile/details for one ISIN, including holdings and country/sector allocations.

• get_chart — historical chart/performance series for one ISIN.

• compare_charts — compare performance series for multiple ISINs.

• get_live_quote — latest gettex/EUR quote via justETF's WebSocket feed.

There is also a justetf://help resource with brief usage notes.

Related MCP server: polygon-mcp

Install

uv sync

Or install as a Python package:

pip install .

Run locally

uv run justetf-mcp

The server communicates over stdio, which is the usual transport for local MCP clients.

MCP client configuration

Example configuration for a stdio MCP client:

{
  "mcpServers": {
    "justetf": {
      "command": "uv",
      "args": ["--directory", "/absolute/path/to/justetf-mcp", "run", "justetf-mcp"]
    }
  }
}

If you install the package globally/in a dedicated venv, use the justetf-mcp executable directly.

Example prompts

• "Search justETF for MSCI World accumulating ETFs and show TER and fund size."

• "Get the profile for IE00B4L5Y983 without live quote."

• "Compare IE00B4L5Y983 and IE00B3RBWM25 over the last 5 years."

• "Fetch the last 30 chart rows for IE00B5BMR087."

Development

uv sync --dev      # install runtime + dev dependencies
uv run pytest -q   # run the test suite
uv run ruff check . # lint

How the underlying scraper reaches justETF

The upstream justetf-scraping package currently uses:

• Screener: https://www.justetf.com/en/search.html with Wicket AJAX POST requests.

• Chart data: https://www.justetf.com/api/etfs/{isin}/performance-chart.

• Live quote: wss://api.mobile.stock-data-subscriptions.justetf.com/?subscription=trend&parameters=isins:{isin}/currency:EUR/language:en.

• Profile pages: https://www.justetf.com/en/etf-profile.html?isin={isin} plus AJAX expansion for allocations.

Acknowledgements

Data access is provided by the third-party druzsan/justetf-scraping package, which is MIT licensed. This project is not affiliated with or endorsed by justETF.

License

MIT © Paolo Gentili. The bundled dependency justetf-scraping is also MIT licensed, so the two are license-compatible.