ChainFETCH MCP Server

A Model Context Protocol (MCP) server that provides access to ChainFETCH API - an AI-powered Ethereum blockchain intelligence platform with advanced semantic search capabilities.

Features

ChainFETCH combines real-time blockchain streaming with AI-powered analysis to provide:

• 🔥 Live Block Streaming: Real-time Ethereum block processing every ~12 seconds
• 🧠 AI-Powered Semantic Search: Vector similarity search using Qwen3-Embedding-0.6B model
• 🤖 LLM-Enhanced Queries: LLaMA 3.2 3B model for intelligent parameter selection
• ⚡ Multi-Modal Search: Semantic, LLM, and JSON search options
• 🎯 Comprehensive Coverage: Addresses, transactions, blocks, tokens, and smart contracts

Available Tools

Address Analysis

• search_addresses_semantic - AI-powered vector similarity search
• search_addresses_json - 150+ parameter filtering
• search_addresses_llm - Natural language to smart parameter selection
• get_address_summary - AI-generated address summaries
• get_address_info - Detailed address information

Transaction Intelligence

• search_transactions_semantic - Semantic transaction search
• search_transactions_json - 254+ curated parameters
• search_transactions_llm - Natural language transaction queries
• get_transaction_summary - AI transaction summaries
• get_transaction_info - Detailed transaction data

Block Analysis

• search_blocks_semantic - AI-powered block search
• search_blocks_json - 120+ block parameters
• search_blocks_llm - Natural language block queries
• get_block_summary - AI block summaries
• get_block_info - Detailed block information

Token Intelligence

• search_tokens_semantic - Semantic token search
• search_tokens_json - Comprehensive token filtering
• search_tokens_llm - Natural language token queries
• get_token_summary - AI token summaries
• get_token_info - Detailed token information
• get_nft_instance_info - NFT instance details

Smart Contract Analysis

• search_smart_contracts_semantic - AI contract search
• search_smart_contracts_json - 50+ contract parameters
• search_smart_contracts_llm - Natural language contract queries
• get_smart_contract_summary - AI contract summaries
• get_smart_contract_info - Detailed contract information

Installation

Prerequisites

• Node.js 18.0.0 or higher
• ChainFETCH API token from chainfetch.app

Option 1: NPM Install (Recommended)

npm install -g chainfetch-mcp-server

Option 2: From Source

git clone https://github.com/chainfetch/chainfetch-mcp-server.git
cd chainfetch-mcp-server
npm install
npm run build
npm link

Configuration

Environment Variables

Set your ChainFETCH API token:

export CHAINFETCH_API_TOKEN="your_api_token_here"

For Claude Desktop

Add to your Claude Desktop configuration file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "chainfetch": {
      "command": "npx",
      "args": ["chainfetch-mcp-server"],
      "env": {
        "CHAINFETCH_API_TOKEN": "CHAINFETCH_API_TOKEN"
      }
    }
  }
}

For Claude via ngrok (HTTP Mode)

Start the server in HTTP mode:

MCP_HTTP_MODE=true chainfetch-mcp-server

In another terminal, start ngrok:

ngrok http 8000

Configure Claude MCP Connector with:

• Server URL: https://your-ngrok-url.ngrok.app/streamable-http
• API Key: Your ChainFETCH API token

Usage Examples

Semantic Search

// Find whale addresses
search_addresses_semantic({
  query: "whale addresses with high ETH balance and DeFi activity",
  limit: 10
})

// Find suspicious transactions
search_transactions_semantic({
  query: "high gas transactions with failed status",
  limit: 5
})

Natural Language Queries

// LLM-powered address search
search_addresses_llm({
  query: "Show me verified smart contracts deployed in the last month"
})

// LLM-powered transaction search
search_transactions_llm({
  query: "Find large value transfers between exchanges"
})

Structured Filtering

// JSON search with specific parameters
search_addresses_json({
  eth_balance_min: "10.0",
  is_contract: true,
  is_verified: true,
  transactions_count_min: 1000,
  limit: 20
})

Detailed Analysis

// Get comprehensive address information
get_address_info({
  address: "0x742D35Cc6335C06576BE5A1D5E2A7df9e7B0E8df"
})

// Get AI-generated summary
get_address_summary({
  address_hash: "0x742D35Cc6335C06576BE5A1D5E2A7df9e7B0E8df"
})

API Coverage

This MCP server provides access to ChainFETCH's comprehensive API including:

• 150+ Address Parameters: Balance, contract status, transaction counts, token holdings
• 254+ Transaction Parameters: Value, gas, addresses, block info, token transfers
• 120+ Block Parameters: Height, gas usage, transaction counts, miner info
• Token Analysis: ERC-20, ERC-721, ERC-1155 support with metadata
• Smart Contract Intelligence: Verification status, proxy patterns, ABI analysis

Error Handling

The server provides detailed error messages for common issues:

• Missing API token
• Invalid addresses/hashes
• Rate limiting
• Network connectivity issues

Development

Local Development

# Install dependencies
npm install

# Run in development mode
npm run dev

# Run in HTTP mode for testing
npm run dev:http

Testing with Claude

1. Set up your API token
2. Configure Claude Desktop or use ngrok
3. Test with simple queries first
4. Use the semantic search for exploratory analysis

Support

• Documentation: ChainFETCH API Docs
• API Access: Get API Token
• Issues: GitHub Issues

License

MIT License - see LICENSE file for details.

Changelog

v1.0.0

• Initial release
• Full ChainFETCH API integration
• Semantic, LLM, and JSON search modes
• Address, transaction, block, token, and smart contract tools
• Claude Desktop and ngrok HTTP support