Yahoo Finance MCP Server

A Model Context Protocol (MCP) server that provides real-time stock data, historical prices, news, and comparison features using Yahoo Finance data. Built following Dedalus Labs server guidelines with streamable HTTP transport as the primary method.

Features

• Real-time Quotes: Get current stock prices and market data

• Historical Data: Retrieve OHLCV data for any time range

• News: Fetch latest news headlines for any ticker

• Comparison: Compare multiple stocks side by side

• Streamable HTTP Transport: Modern HTTP transport for production deployment

• STDIO Transport: Development-friendly transport for local testing

• Session Management: Proper session handling for HTTP connections

• Health Checks: Built-in health monitoring endpoints

Architecture

This server follows the Dedalus Labs MCP Server Guidelines with:

• Modular Architecture: Clear separation of concerns with dedicated modules

• Streamable HTTP First: Modern HTTP transport as the primary interface

• Type Safety: Full TypeScript coverage with proper interfaces

• Production Ready: Built-in error handling, logging, and configuration management

• Testable: Dependency injection and isolated components

Directory Structure

src/
├── index.ts            # Main entry point
├── cli.ts              # Command-line argument parsing
├── config.ts           # Configuration management
├── server.ts           # Server instance creation
├── client.ts           # External API client (Yahoo Finance)
├── yahoo-finance-service.ts  # Service layer
├── types.ts            # TypeScript type definitions
├── tools/
│   ├── index.ts        # Tool exports
│   └── yahoo-finance.ts # Tool definitions and handlers
└── transport/
    ├── index.ts        # Transport exports
    ├── http.ts         # HTTP transport (primary)
    └── stdio.ts        # STDIO transport (development)

MCP Tools

1. get_quote

Get current price and market snapshot for a stock.

Parameters:

• ticker (string, required): Stock ticker symbol (e.g., AAPL, GOOGL, MSFT)

Example:

{
  "ticker": "AAPL"
}

Response:

{
  "ticker": "AAPL",
  "price": 150.25,
  "change": 2.15,
  "changePercent": 1.45,
  "volume": 45000000,
  "marketCap": 2500000000000,
  "pe": 25.5,
  "high52Week": 180.00,
  "low52Week": 120.00,
  "open": 148.50,
  "previousClose": 148.10,
  "timestamp": "2024-01-15T10:30:00.000Z"
}

2. get_historical_data

Get historical OHLCV data for a stock.

Parameters:

• ticker (string, required): Stock ticker symbol

• range (string, optional): Time range - 1d, 5d, 1mo, 3mo, 6mo, 1y, 2y, 5y, 10y, ytd, max (default: 1mo)

• interval (string, optional): Data interval - 1m, 2m, 5m, 15m, 30m, 60m, 90m, 1h, 1d, 5d, 1wk, 1mo, 3mo (default: 1d)

3. get_news

Get latest news headlines for a stock.

Parameters:

• ticker (string, required): Stock ticker symbol

• limit (number, optional): Number of news items (1-50, default: 5)

4. compare_stocks

Compare multiple stocks side by side.

Parameters:

• tickers (array, required): Array of stock ticker symbols (2-10 tickers)

Installation

1. Clone the repository:

git clone <repository-url>
cd yahoo-finance-mcp

2. Install dependencies:

npm install

3. Build the project:

npm run build

Usage

STDIO Transport (Development)

For local development and testing:

# List available tools
echo '{"jsonrpc": "2.0", "id": 1, "method": "tools/list", "params": {}}' | npm run start:stdio

# Get Apple stock quote
echo '{"jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": {"name": "get_quote", "arguments": {"ticker": "AAPL"}}}' | npm run start:stdio

# Compare multiple stocks
echo '{"jsonrpc": "2.0", "id": 3, "method": "tools/call", "params": {"name": "compare_stocks", "arguments": {"tickers": ["AAPL", "GOOGL", "MSFT"]}}}' | npm run start:stdio

HTTP Transport (Production)

For production deployment with streamable HTTP:

# Start HTTP server
npm start

# Health check
curl http://localhost:8080/health

# The server supports both:
# - /mcp endpoint for streamable HTTP transport
# - /sse endpoint for SSE transport (backward compatibility)

Command Line Options

# Run with custom port
npm start -- --port 3000

# Force STDIO transport
npm run start:stdio

# Show help
npm start -- --help

Configuration

Environment Variables

• PORT: HTTP server port (default: 8080)

• NODE_ENV: Set to 'production' for production mode

Client Configuration

For MCP clients, use this configuration:

{
  "mcpServers": {
    "yahoo-finance": {
      "url": "http://localhost:8080/mcp"
    }
  }
}

For backward compatibility with SSE:

{
  "mcpServers": {
    "yahoo-finance": {
      "url": "http://localhost:8080/sse"
    }
  }
}

Testing

Run Comprehensive Tests

# Test both transports
node test-dedalus-mcp.js

# Test individual tools
echo '{"jsonrpc": "2.0", "id": 1, "method": "tools/list", "params": {}}' | npm run start:stdio

Health Monitoring

# Check server health
curl http://localhost:8080/health

# Expected response:
{
  "status": "healthy",
  "timestamp": "2024-01-15T10:30:00.000Z",
  "service": "yahoo-finance-mcp",
  "version": "0.2.0"
}

Development

Available Scripts

• npm run build: Compile TypeScript to JavaScript

• npm run watch: Watch mode for development

• npm start: Start HTTP server

• npm run start:stdio: Start STDIO server

• npm run dev: Build and start HTTP server

• npm run dev:stdio: Build and start STDIO server

Project Structure

The server follows the Dedalus Labs guidelines with:

• Modular Design: Each component has a specific responsibility

• Transport Abstraction: Easy switching between HTTP and STDIO

• Configuration Management: Environment-based configuration

• Error Handling: Comprehensive error handling throughout

• Type Safety: Full TypeScript coverage

Production Deployment

Docker Deployment

FROM node:18-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY dist/ ./dist/
EXPOSE 8080
CMD ["node", "dist/index.js"]

Environment Setup

# Production environment
export NODE_ENV=production
export PORT=8080
npm start

Dependencies

• @modelcontextprotocol/sdk: Official MCP SDK (v1.17.3+)

• yahoo-finance2: Yahoo Finance API client

• dotenv: Environment variable management

License

MIT License

Contributing

1. Fork the repository

2. Create a feature branch

3. Make your changes following the Dedalus Labs guidelines

4. Add tests if applicable

5. Submit a pull request

Support

For issues and questions, please open an issue on the GitHub repository.

References

• Dedalus Labs MCP Server Guidelines

• Model Context Protocol Documentation

• Yahoo Finance API