Screener Server

An MCP server for Screener.in — search Indian listed companies, pull key ratios, multi-year financial statements, peer comparisons, and run custom fundamental screens, all from Claude (or any MCP client).

Important: no official API

Screener.in explicitly states they don't provide an API — only CSV export from the UI. This server works by reading the same public, signed-out pages a browser would see (search, company pages, and the /screen/raw/ query endpoint). It does not require login for the core tools.

Because this isn't an official API:

• Please keep request volume reasonable — the server throttles and caches requests for you (5 min cache, ~600ms min gap between requests), don't work around that.
• Guest (logged-out) access to custom screens is capped by Screener to a small number of result rows. If you want more rows or CSV-export-only data, set SCREENER_SESSION_COOKIE (see below) to a cookie from your own logged-in session.
• Screener's HTML structure can change without notice; if a tool starts erroring, the CSS selectors in src/services/scraper.ts likely need a small update.
• Review Screener's Terms before heavy or commercial use.

Tools

Tool	What it does
screener_search_companies	Look up a company's Screener ID/URL by name or ticker
screener_get_company_overview	Key ratios (Market Cap, P/E, ROE, ROCE, etc.), About text, Pros/Cons
screener_get_financial_statement	Quarterly results, P&L, balance sheet, cash flow, or ratios — multi-year table
screener_get_peer_comparison	The peer-comparison table shown on a company's page
screener_run_custom_screen	Run a Screener query-builder screen (e.g. Market Capitalization > 500 AND Return on equity > 22) across the whole market
technical_get_indicator	RSI, SMA, EMA, or MACD for an NSE/BSE stock, via Alpha Vantage

Why compute indicators ourselves instead of using Groww or Alpha Vantage?

• Groww's official MCP (mcp.groww.in) is account-linked via OAuth (it's built to read your portfolio/trades). Folding it into this server would mean building a full OAuth pass-through proxy — a much bigger project, and unnecessary for public technicals like RSI.
• Alpha Vantage's NSE/BSE coverage (NSE:TICKER format) turned out to be unreliable in practice — it often only returns NASDAQ data despite documentation claiming Indian exchange support.

Instead, technical_get_indicator pulls raw historical close prices from Yahoo Finance's public chart endpoint (ticker + .NS/.BO suffix — the same data source most community NSE tooling, like yfinance, relies on) and computes RSI (Wilder's method), SMA, EMA, and MACD (12/26/9) server-side using standard formulas. No API key, no OAuth, no external rate limits — just one more tool in the same connector.

Since this is an unofficial-but-widely-used endpoint (not a documented Yahoo API), if it ever breaks, check src/services/yahoo.ts — the fix is usually just adjusting the URL or response shape to match Yahoo's current chart endpoint.

Setup

npm install
npm run build

Run locally (stdio) — for Claude Desktop / Claude Code

Add to your MCP client config (e.g. claude_desktop_config.json):

{
  "mcpServers": {
    "screener": {
      "command": "node",
      "args": ["/absolute/path/to/screener-mcp-server/dist/index.js"]
    }
  }
}

Run as a remote HTTP server

TRANSPORT=http PORT=3000 npm start

Then point your MCP client at http://localhost:3000/mcp.

Optional: logged-in session for more screen results

export SCREENER_SESSION_COOKIE="csrftoken=...; sessionid=..."

Grab this from your browser's DevTools → Network tab → any request to screener.in → Cookie request header, while logged into your own Screener account. Never share this value; it's your personal session.

Development

npm run dev    # tsc --watch

If Screener changes their page markup and a tool starts failing, check the selectors in src/services/scraper.ts (#top-ratios, .pros/.cons, #profit-loss/#balance-sheet/etc. table sections, #peers table) against the current HTML.