🚀 RealTime CryptoPrice MCP Server

A comprehensive Model Context Protocol (MCP) server implementation that provides real-time cryptocurrency price data from CoinGecko API. This project demonstrates both traditional MCP stdio transport and modern HTTP endpoints for enhanced testing and integration capabilities.

📋 Table of Contents

• 🎯 Overview
• ✨ Features
• 🏗️ Architecture
• 🚀 Quick Start
• 📖 Step-by-Step Tutorial
• 🔧 Usage
• 📡 API Endpoints
• 🛠️ Development
• 🧪 Testing
• 🚀 Deployment
• 🤝 Contributing
• 📄 License

🎯 Overview

This project implements a Model Context Protocol (MCP) server that serves as a bridge between AI agents and real-time cryptocurrency market data. It provides:

• Standard MCP Interface: Compatible with any MCP-compliant client
• HTTP Web Dashboard: Beautiful, responsive interface for testing and monitoring
• Real-time Data: Live cryptocurrency prices from CoinGecko API
• Dual Transport: Both stdio (standard MCP) and HTTP endpoints

What is MCP?

Model Context Protocol (MCP) is a standardized protocol that enables AI agents to access external data sources and tools in a secure, consistent manner. This server exposes cryptocurrency market data through MCP tools that AI agents can invoke.

✨ Features

🔥 Core Features

• Real-time Price Data: Live cryptocurrency prices and market data
• Multiple Cryptocurrencies: Support for Bitcoin, Ethereum, and 1000+ coins
• Currency Flexibility: Prices in USD, EUR, JPY, GBP, CAD, AUD
• Top Crypto Rankings: Market cap-based cryptocurrency listings
• Clean API Design: RESTful endpoints with JSON responses

🎨 Web Interface Features

• Responsive Dashboard: Beautiful, mobile-friendly interface
• Live Status Monitoring: Real-time server health checks
• Interactive Forms: Easy cryptocurrency price lookups
• Market Overview: Top cryptocurrencies with 24h changes
• Error Handling: Graceful error messages and loading states

🔧 Technical Features

• MCP Protocol: Standard stdio transport for AI agent integration
• Express.js Server: HTTP endpoints for web interface and API access
• TypeScript Support: Full type definitions and validation with Zod
• Error Resilience: Comprehensive error handling and recovery
• Production Ready: Optimized for deployment and scaling

🏗️ Architecture

graph TB
    A[AI Agent/Client] --> B[MCP Server - stdio]
    C[Web Browser] --> D[Express HTTP Server]
    B --> E[CoinGecko API]
    D --> E
    E --> F[Real-time Price Data]
    
    subgraph "MCP Tools"
        G[getCryptoPrice]
        H[listTopCryptos]
    end
    
    B --> G
    B --> H
    D --> G
    D --> H

Component Architecture

1. Protocol Layer: MCP stdio transport for AI agent communication
2. Service Layer: Business logic for cryptocurrency data processing
3. Data Layer: CoinGecko API integration and caching
4. Presentation Layer: HTTP server with web dashboard

🚀 Quick Start

Prerequisites

• Node.js 18+ installed
• Git installed
• Terminal/Command prompt access

Installation

# Clone the repository
git clone https://github.com/AdI-70/realtime-cryptoprice-MCP.git
cd realtime-cryptoprice-MCP

# Install dependencies
npm install

# Start the web server
npm run web

Open http://localhost:3000 in your browser to see the dashboard!

Test MCP Server

# In a separate terminal, test the MCP client
npm run client

📖 Step-by-Step Tutorial: Building from Scratch

Step 1: Project Setup

1. Create Project Directory

   mkdir crypto-mcp-server
   cd crypto-mcp-server
   

2. Initialize Node.js Project

   npm init -y
   

3. Configure ES Modules

   // Add to package.json
   {
     "type": "module",
     "scripts": {
       "start": "node server.js",
       "client": "node client.js",
       "web": "node web-server.js"
     }
   }
   

Step 2: Install Dependencies

# Core MCP dependencies
npm install @modelcontextprotocol/sdk zod node-fetch

# Web server dependencies
npm install express

Step 3: Create MCP Server (server.js)

import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { z } from "zod";
import fetch from "node-fetch";

// Create MCP server instance
const server = new McpServer({
  name: "CryptoPrice",
  version: "1.0.0"
});

// Define getCryptoPrice tool
server.tool("getCryptoPrice", {
  id: z.string().describe("Cryptocurrency ID (e.g., bitcoin, ethereum)"),
  currency: z.string().default("usd").describe("Currency (usd, eur, etc.)")
}, async ({ id, currency }) => {
  try {
    const response = await fetch(
      `https://api.coingecko.com/api/v3/simple/price?ids=${id}&vs_currencies=${currency}`
    );
    const data = await response.json();
    
    if (!data[id]) {
      return { content: [{ type: "text", text: `Cryptocurrency '${id}' not found.` }] };
    }
    
    const price = data[id][currency];
    return {
      content: [{ type: "text", text: `${id}: ${price} ${currency.toUpperCase()}` }]
    };
  } catch (error) {
    return {
      content: [{ type: "text", text: `Error: ${error.message}` }]
    };
  }
});

// Define listTopCryptos tool
server.tool("listTopCryptos", {
  limit: z.number().default(10).describe("Number of top cryptocurrencies")
}, async ({ limit }) => {
  try {
    const response = await fetch(
      `https://api.coingecko.com/api/v3/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=${limit}&page=1`
    );
    const data = await response.json();
    
    const cryptoList = data.map(crypto => 
      `${crypto.name} (${crypto.symbol}): $${crypto.current_price}`
    ).join('\n');
    
    return { content: [{ type: "text", text: cryptoList }] };
  } catch (error) {
    return {
      content: [{ type: "text", text: `Error: ${error.message}` }]
    };
  }
});

// Start server with stdio transport
const transport = new StdioServerTransport();
console.log("Starting CryptoPrice MCP server...");
await server.connect(transport);
console.log("CryptoPrice MCP server running");

Step 4: Create MCP Client (client.js)

import { Client } from "@modelcontextprotocol/sdk/client/index.js";
import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";

async function main() {
  // Create transport to connect to server
  const transport = new StdioClientTransport({
    command: "node",
    args: ["server.js"]
  });

  // Create client
  const client = new Client({
    name: "crypto-price-client",
    version: "1.0.0"
  });

  // Connect and test
  await client.connect(transport);
  
  try {
    console.log("Connected to CryptoPrice MCP server\n");

    // Test Bitcoin price
    const bitcoinPrice = await client.callTool({
      name: "getCryptoPrice",
      arguments: { id: "bitcoin", currency: "usd" }
    });
    console.log("Bitcoin Price:", bitcoinPrice.content[0].text);

    // Test top cryptocurrencies
    const topCryptos = await client.callTool({
      name: "listTopCryptos",
      arguments: { limit: 5 }
    });
    console.log("\nTop 5 Cryptocurrencies:");
    console.log(topCryptos.content[0].text);
    
  } catch (error) {
    console.error("Error:", error.message);
  }
}

main().catch(console.error);

Step 5: Create Web Server (web-server.js)

import express from 'express';
import path from 'path';
import { fileURLToPath } from 'url';
import fetch from 'node-fetch';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const app = express();
const PORT = 3000;

// Middleware
app.use(express.json());
app.use(express.static('public'));

// API Routes
app.get('/api/crypto/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const { currency = 'usd' } = req.query;
    
    const response = await fetch(
      `https://api.coingecko.com/api/v3/simple/price?ids=${id}&vs_currencies=${currency}`
    );
    const data = await response.json();
    
    if (!data[id]) {
      return res.status(404).json({ error: `Cryptocurrency '${id}' not found` });
    }
    
    res.json({
      id,
      currency: currency.toUpperCase(),
      price: data[id][currency],
      formatted: `${id}: ${data[id][currency]} ${currency.toUpperCase()}`
    });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

app.get('/api/top-cryptos', async (req, res) => {
  try {
    const { limit = 10 } = req.query;
    
    const response = await fetch(
      `https://api.coingecko.com/api/v3/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=${limit}&page=1`
    );
    const data = await response.json();
    
    const cryptoList = data.map(crypto => ({
      id: crypto.id,
      name: crypto.name,
      symbol: crypto.symbol.toUpperCase(),
      price: crypto.current_price,
      change_24h: crypto.price_change_percentage_24h
    }));
    
    res.json({ cryptos: cryptoList, count: cryptoList.length });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Health check
app.get('/api/health', (req, res) => {
  res.json({ 
    status: 'healthy', 
    server: 'CryptoPrice MCP Web Server',
    timestamp: new Date().toISOString()
  });
});

app.listen(PORT, () => {
  console.log(`🚀 Server running at http://localhost:${PORT}`);
});

Step 6: Create Web Dashboard

1. Create public directory

   mkdir public
   

2. Create public/index.html (Beautiful responsive dashboard)

   • Complete HTML with CSS styling
   • JavaScript for API interactions
   • Real-time updates and error handling

Step 7: Configure Git

1. Create .gitignore

   node_modules/
   *.log
   .env
   .DS_Store
   

2. Initialize Git repository

   git init
   git add .
   git commit -m "Initial commit: CryptoPrice MCP server"
   

Step 8: Create MCP Configuration

Create mcpserver.json

{
  "servers": [{
    "name": "CryptoPrice",
    "command": "node",
    "args": ["server.js"],
    "description": "Cryptocurrency price data from CoinGecko",
    "metadata": {
      "version": "1.0.0",
      "tools": [
        {
          "name": "getCryptoPrice",
          "description": "Get current price of a cryptocurrency"
        },
        {
          "name": "listTopCryptos", 
          "description": "List top cryptocurrencies by market cap"
        }
      ]
    }
  }]
}

🔧 Usage

MCP Server (stdio transport)

# Start MCP server
npm start

# Test with client
npm run client

Web Interface

# Start web server
npm run web

# Open browser
open http://localhost:3000

API Integration

// Get Bitcoin price
fetch('http://localhost:3000/api/crypto/bitcoin')
  .then(response => response.json())
  .then(data => console.log(data));

// Get top 5 cryptocurrencies
fetch('http://localhost:3000/api/top-cryptos?limit=5')
  .then(response => response.json())
  .then(data => console.log(data));

📡 API Endpoints

Example Responses

GET /api/crypto/bitcoin

{
  "id": "bitcoin",
  "currency": "USD",
  "price": 43250.50,
  "formatted": "bitcoin: 43250.50 USD"
}

GET /api/top-cryptos?limit=3

{
  "cryptos": [
    {
      "id": "bitcoin",
      "name": "Bitcoin",
      "symbol": "BTC",
      "price": 43250.50,
      "change_24h": 2.5
    }
  ],
  "count": 3
}

🛠️ Development

Project Structure

crypto-mcp-server/
├── server.js              # MCP server (stdio transport)
├── client.js              # MCP client for testing
├── web-server.js          # HTTP server with API endpoints
├── package.json           # Dependencies and scripts
├── mcpserver.json         # MCP server configuration
├── .gitignore            # Git ignore rules
├── public/
│   └── index.html        # Web dashboard
└── README.md             # This file

Adding New Features

1. Add new MCP tool

   server.tool("newTool", {
     param: z.string().describe("Parameter description")
   }, async ({ param }) => {
     // Implementation
     return { content: [{ type: "text", text: "Result" }] };
   });
   

2. Add new API endpoint

   app.get('/api/new-endpoint', async (req, res) => {
     // Implementation
     res.json({ result: "data" });
   });
   

Environment Variables

Create .env file for configuration:

PORT=3000
API_BASE_URL=https://api.coingecko.com/api/v3
CACHE_DURATION=60000

🧪 Testing

Manual Testing

# Test MCP server
npm run client

# Test web server
curl http://localhost:3000/api/crypto/bitcoin
curl http://localhost:3000/api/top-cryptos?limit=5

Automated Testing

# Install testing dependencies
npm install --save-dev jest supertest

# Run tests
npm test

🚀 Deployment

Local Deployment

# Install PM2 for process management
npm install -g pm2

# Start with PM2
pm2 start web-server.js --name "crypto-mcp-web"
pm2 start server.js --name "crypto-mcp-server"

Docker Deployment

FROM node:18-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["npm", "run", "web"]

Cloud Deployment

• Heroku: Use Procfile with web: node web-server.js
• Vercel: Deploy as serverless functions
• Railway: Direct Git deployment
• DigitalOcean: Use App Platform

🤝 Contributing

1. Fork the repository
2. Create feature branch (git checkout -b feature/amazing-feature)
3. Commit changes (git commit -m 'Add amazing feature')
4. Push to branch (git push origin feature/amazing-feature)
5. Open Pull Request

Development Guidelines

• Follow ES6+ standards
• Add JSDoc comments for functions
• Test all new features
• Update documentation

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🔗 Links

• Repository: https://github.com/AdI-70/realtime-cryptoprice-MCP
• CoinGecko API: https://www.coingecko.com/en/api
• MCP Protocol: https://modelcontextprotocol.io
• Express.js: https://expressjs.com

Built with ❤️ by AdI-70