MCP-Blockchain-Scanner

dericsanandres/MCP-Blockchain-Scanner

3.2

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A Python implementation of an MCP server providing Ethereum blockchain data via Etherscan's API.

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MCP Etherscan Server (Python)

A Python implementation of an MCP (Model Context Protocol) server that provides comprehensive Ethereum blockchain data through Etherscan's API. Built with modern Python tools and designed for seamless integration with Claude Desktop.

Ready for Production | Pure Python | MCP Compatible | Fast & Reliable

Features

  • ETH Balance Checking: Get real-time ETH balance for any Ethereum address
  • Transaction History: View recent transactions with detailed information
  • Token Transfers: Track ERC20 token transfers with comprehensive token details
  • Smart Contract ABI: Fetch verified smart contract ABIs for development
  • Live Gas Prices: Monitor current gas prices (Safe, Standard, Fast) in real-time
  • ENS Resolution: Resolve Ethereum addresses to ENS names
  • Input Validation: Robust address validation with clear error messages
  • Modern Architecture: Built with FastMCP and Pydantic for reliability

Prerequisites

Installation

  1. Clone the repository:
git clone [your-repo-url]
cd mcp-etherscan
  1. Create a virtual environment:
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate
  1. Install dependencies:
pip install -r requirements.txt
  1. Create a .env file in the root directory:
ETHERSCAN_API_KEY=your_api_key_here

Quick Start

Option 1: Use the setup script (recommended)

chmod +x setup.sh
./setup.sh

Option 2: Manual setup

# Create virtual environment
python3 -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install dependencies
pip install -r requirements.txt

# Copy environment template
cp .env.example .env

Testing the Installation

Before running the server, test that everything works:

# Activate virtual environment
source venv/bin/activate

# Run tests
python run.py test

Expected Output:

Testing Etherscan Service...
==================================================
1. Testing balance check for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
   Balance: 1,247.832156789012345678 ETH
   Balance check successful

2. Testing transaction history for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
   Found 3 transactions
   Latest transaction: 0xa1b2c3d4e5...
   Transaction history successful

3. Testing token transfers for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
   Found 3 token transfers
   Latest transfer: USDC
   Token transfers successful

4. Testing gas prices
   Safe: 12.5 Gwei
   Standard: 15.2 Gwei
   Fast: 18.7 Gwei
   Gas prices successful

5. Testing contract ABI fetch
   Contract ABI test completed
   All core functions working
==================================================
All tests completed successfully!
The Etherscan service is working correctly.

Running the Server

Start the server:

# Using the run script (recommended)
python run.py run

# Or directly
python src/server.py

The server will run on stdio, making it compatible with MCP clients like Claude Desktop.

How It Works

This server implements the Model Context Protocol (MCP) to provide tools for interacting with Ethereum blockchain data through Etherscan's API. Each tool is exposed as an MCP endpoint that can be called by compatible clients.

Available Tools

  1. check-balance

    • Input: Ethereum address
    • Output: ETH balance in both Wei and ETH

  2. get-transactions

    • Input: Ethereum address, optional limit
    • Output: Recent transactions with timestamps, values, and addresses

  3. get-token-transfers

    • Input: Ethereum address, optional limit
    • Output: Recent ERC20 token transfers with token details

  4. get-contract-abi

    • Input: Contract address
    • Output: Contract ABI in JSON format

  5. get-gas-prices

    • Input: None
    • Output: Current gas prices in Gwei

  6. get-ens-name

    • Input: Ethereum address
    • Output: Associated ENS name if available

Using with Claude Desktop

To add this server to Claude Desktop:

  1. Start the server using python src/server.py

  2. In Claude Desktop:

    • Go to Settings
    • Navigate to the MCP Servers section
    • Click "Add Server"
    • Enter the following configuration: 
      {
  "name": "Etherscan Tools (Python)",
  "transport": "stdio",
  "command": "python /path/to/mcp-etherscan/src/server.py"
}
    • Save the configuration

  3. The Etherscan tools will now be available in your Claude conversations

Example Usage in Claude

Once connected, you can interact with Ethereum data naturally:

Balance Queries:

Check the balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045

Transaction Analysis:

Show me the last 5 transactions for vitalik.eth

Gas Price Monitoring:

What are the current Ethereum gas prices?

Token Transfer Tracking:

Find recent USDC transfers for 0x742d35Cc6634C0532925a3b844Bc454e4438f44e

Network Focus

This server is specifically designed for Ethereum Mainnet analysis. For other networks:

  • BSC (Binance Smart Chain): Planned as separate mcp-bsc-server repository
  • Polygon: Planned as separate mcp-polygon-server repository
  • Arbitrum: Planned as separate mcp-arbitrum-server repository
  • Other chains: Each will have dedicated MCP servers for optimal performance

Why separate servers? This modular approach ensures better maintainability, independent deployments, and network-specific optimizations.

Development

To add new features or modify existing ones:

  1. The main server logic is in src/server.py
  2. Etherscan API interactions are handled in src/services/etherscan_service.py
  3. Models are defined in src/models.py

License

MIT License - See LICENSE file for details