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MIDL MCP Server

Model Context Protocol server for MIDL Protocol — Bitcoin L1 + EVM L2 hybrid blockchain.

Bring AI-powered blockchain interaction to Claude Desktop, Cursor, and any MCP client.

Documentation • Main Website • GitHub

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What is This?

The MIDL MCP Server brings full MIDL Protocol capabilities to your AI assistant. Install once, and Claude (or any MCP client) can:

• Deploy smart contracts with Solidity templates
• Check balances on both Bitcoin L1 and EVM L2
• Bridge BTC between L1 and L2
• Manage Bitcoin Runes (etch, transfer, bridge to ERC20)
• Transfer tokens and native assets
• Read contract state and event logs
• Query network info and system contracts
• And 20+ more operations

All through natural conversation in Claude Desktop or Cursor.

Features

27 Tools Across 9 Categories

Category	Tools	Description
Network	3 tools	Get network info, system contracts, block data
Balance	3 tools	Query EVM balance, BTC balance, token balance
Transfer	3 tools	Transfer EVM, transfer tokens, send raw transactions
Deploy	1 tool	Compile and deploy Solidity contracts with templates
Contract	3 tools	Read contracts, verify contracts, get event logs
Bridge	2 tools	Bridge BTC↔EVM (deposit and withdrawal)
Runes	4 tools	Rune balance, transfer, bridge to/from ERC20
Bitcoin	4 tools	UTXO queries, transaction tracking, fee rates
Utility	3 tools	Convert units, lookup addresses, estimate gas

Dual Transport Architecture

• stdio: For Claude Desktop and Cursor (local development)
• HTTP: For remote clients and web integrations — live at https://mcp.midl-ai.xyz/mcp

Plugin-Based Design

Each category is a self-contained plugin with its own tools. Easy to extend, easy to maintain.

MCP UI Cards

Rich visual feedback with formatted HTML cards showing:

• Transaction details with syntax highlighting
• Status indicators (pending/confirmed/failed)
• Explorer links for transparency
• Formatted addresses and amounts

Server-Side Signing

Secure transaction signing using MIDL_PRIVATE_KEY environment variable. No private keys exposed to the client.

Installation

Prerequisites

• Node.js 18+
• pnpm (recommended) or npm
• MIDL Protocol RPC access
• Private key for transaction signing

Quick Start

# Clone repository
git clone https://github.com/midl-ai/mcp-server
cd midl-mcp-server

# Install dependencies
pnpm install

# Set up environment variables
cp .env.example .env
# Edit .env and add your MIDL_PRIVATE_KEY

# Build
pnpm build

# Test (optional)
pnpm test

Configuration

Environment Variables

Create a .env file:

# Required: Private key for signing transactions
MIDL_PRIVATE_KEY=0x...

# Optional: Custom RPC endpoint (defaults to staging)
MIDL_RPC_URL=https://rpc.staging.midl.xyz

# Optional: Network selection (mainnet or testnet)
MIDL_NETWORK=testnet

Claude Desktop Setup

Add to your Claude Desktop config file:

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

{
  "mcpServers": {
    "midl": {
      "command": "node",
      "args": [
        "/absolute/path/to/midl-mcp-server/dist/index.js"
      ],
      "env": {
        "MIDL_PRIVATE_KEY": "your-private-key-here",
        "MIDL_NETWORK": "testnet"
      }
    }
  }
}

Important: Use absolute paths, not relative paths like ~/.

Cursor Setup

Add to .cursor/config.json in your project:

{
  "mcpServers": {
    "midl": {
      "command": "node",
      "args": [
        "/absolute/path/to/midl-mcp-server/dist/index.js"
      ],
      "env": {
        "MIDL_PRIVATE_KEY": "your-private-key-here"
      }
    }
  }
}

Restart Claude Desktop or Cursor after configuration.

Usage Examples

Once installed, you can use natural language in Claude:

Deploy a Contract

User: Deploy an ERC20 token called MyToken with symbol MTK and 1 million initial supply

Claude: I'll deploy that contract for you...
[Uses midl_deploy_contract tool]
Contract deployed at 0xabc...

Check Balances

User: What's my balance on MIDL?

Claude: Let me check both layers...
[Uses midl_get_btc_balance and midl_get_evm_balance]
Bitcoin L1: 1.5 BTC
EVM L2: 0.3 BTC

Bridge Assets

User: Bridge 0.1 BTC from L1 to L2

Claude: I'll initiate the bridge transaction...
[Uses midl_bridge_btc_to_evm]
Bridge initiated. Transaction ID: 0x...
Waiting for confirmations...
Complete! Your L2 balance has been updated.

Manage Runes

User: Transfer 50 UNCOMMON•GOODS rune to kaspa:qr...

Claude: Transferring rune...
[Uses midl_transfer_rune]
Rune transferred. TX: abc123...

Read Contracts

User: Read the totalSupply from the ERC20 at 0x123...

Claude: Reading contract...
[Uses midl_read_contract]
Total Supply: 1,000,000 tokens

Project Structure

midl-mcp-server/
├── src/
│   ├── plugins/              # All 9 plugin categories
│   │   ├── base/             # Base classes (PluginBase, ToolBase)
│   │   ├── network/          # 3 network tools
│   │   ├── balance/          # 3 balance tools
│   │   ├── transfer/         # 3 transfer tools
│   │   ├── deploy/           # 1 deploy tool + templates
│   │   ├── contract/         # 3 contract tools
│   │   ├── bridge/           # 2 bridge tools
│   │   ├── runes/            # 4 runes tools
│   │   ├── bitcoin/          # 4 bitcoin tools
│   │   └── utility/          # 3 utility tools
│   ├── ui/                   # MCP UI card generators
│   │   ├── index.ts          # Base card creators
│   │   ├── tx-cards.ts       # Transaction cards
│   │   └── card-generators.ts # Maps tools to UI
│   ├── wallet.ts             # EVM wallet client (viem)
│   ├── btc-wallet.ts         # Bitcoin wallet client (@midl/node)
│   ├── config.ts             # Constants and configuration
│   ├── types.ts              # Shared TypeScript types
│   └── server.ts             # MCP server entry point
├── dist/                     # Built artifacts (generated)
├── tests/                    # Unit tests
├── .env.example              # Environment template
├── package.json              # Dependencies
├── tsconfig.json             # TypeScript config
└── vitest.config.ts          # Test configuration

Development

Build

# Type check
pnpm typecheck

# Build for production
pnpm build

# Watch mode (rebuilds on changes)
pnpm build:watch

Testing

# Run all tests
pnpm test

# Watch mode
pnpm test:watch

# Coverage report
pnpm test:coverage

Linting

# Check for issues
pnpm lint

# Auto-fix
pnpm lint:fix

Tool Reference

Network Tools

• midl_get_network_info - Get chain ID, block height, RPC endpoints
• midl_get_system_contracts - Query system contract addresses
• midl_get_block - Fetch block data by number or hash

Balance Tools

• midl_get_evm_balance - Query EVM native balance
• midl_get_btc_balance - Query Bitcoin UTXO balance
• midl_get_token_balance - Query ERC20 token balance

Transfer Tools

• midl_transfer_evm - Send native BTC on EVM L2
• midl_transfer_token - Send ERC20 tokens
• midl_send_raw_transaction - Submit pre-signed transaction

Deploy Tools

• midl_deploy_contract - Compile and deploy Solidity contracts

Templates:

• erc20 - Standard fungible token
• counter - Simple counter contract
• storage - Key-value storage

Contract Tools

• midl_read_contract - Call read-only contract methods
• midl_get_logs - Query contract event logs
• midl_verify_contract - Verify contract on explorer

Bridge Tools

• midl_bridge_btc_to_evm - Deposit BTC from L1 to L2
• midl_bridge_evm_to_btc - Withdraw BTC from L2 to L1

Runes Tools

• midl_get_runes - List all runes
• midl_get_rune_balance - Check rune balance
• midl_transfer_rune - Transfer runes
• midl_bridge_rune_to_erc20 - Bridge rune to ERC20 token

Bitcoin Tools

• midl_get_utxos - Query UTXOs for address
• midl_get_transaction - Get transaction details
• midl_get_transaction_receipt - Get transaction receipt
• midl_get_fee_rate - Get current fee rate

Utility Tools

• midl_convert_btc_to_evm - Convert BTC units to wei
• midl_get_rune_erc20_address - Lookup rune's ERC20 address
• midl_estimate_gas - Estimate gas for transaction

Architecture Details

Plugin System

Each plugin extends PluginBase and uses the @Tool decorator:

export class NetworkPlugin extends PluginBase {
  @Tool({
    name: 'midl_get_network_info',
    description: 'Get MIDL network information',
    inputSchema: networkInfoSchema,
    readOnlyHint: true,
    destructiveHint: false
  })
  async getNetworkInfo(): Promise<ToolResponse<NetworkInfo>> {
    // Implementation
  }
}

Wallet Clients

EVM Wallet (src/wallet.ts):

• Uses viem for EVM operations
• Custom MIDL chain configuration
• Transaction signing with private key

Bitcoin Wallet (src/btc-wallet.ts):

• Uses @midl/node for Bitcoin operations
• UTXO selection and transaction building
• KeyPair connector for signing

Error Handling

All tools return standardized responses:

type ToolResponse<T> = {
  success: true;
  data: T;
} | {
  success: false;
  error: string;
  code?: ErrorCode;
};

Type Safety

Full TypeScript strict mode. No any types. All inputs validated with Zod schemas.

Security

Private Key Management

• Never commit .env to version control
• Use environment variables for production
• Consider hardware wallets for mainnet
• Rotate keys regularly

RPC Security

• Use secure HTTPS endpoints only
• Consider rate limiting for production
• Monitor for unusual activity

Input Validation

All tool inputs are validated using Zod schemas before execution.

Troubleshooting

Server Not Starting

Issue: Claude Desktop can't connect to the MCP server

Solutions:

1. Check absolute paths in config (no ~/)
2. Verify Node.js is in PATH
3. Check dist/index.js exists (run pnpm build)
4. Review Claude Desktop logs

Private Key Issues

Issue: "Invalid private key" error

Solutions:

1. Ensure key starts with 0x
2. Check key length (64 hex characters + 0x)
3. Verify key has testnet funds
4. Test key with a simple transaction

Network Connection

Issue: "Failed to connect to RPC" error

Solutions:

1. Check MIDL_RPC_URL is correct
2. Verify network connectivity
3. Test RPC with curl: curl https://rpc.staging.midl.xyz
4. Check firewall settings

Tool Execution Failures

Issue: Tools return errors

Solutions:

1. Check transaction has sufficient gas
2. Verify address formats are correct
3. Ensure wallet has sufficient balance
4. Review error message for specifics

Contributing

We welcome contributions! Here's how:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-tool)
3. Add your tool or fix
4. Write tests
5. Submit a pull request

Adding a New Tool

1. Create tool file in appropriate plugin directory
2. Extend ToolBase and use @Tool decorator
3. Add Zod schema for input validation
4. Implement execute() method
5. Add unit tests
6. Update plugin's index.ts

Related Projects

• MIDL Frontend - AI chat interface
• MIDL Protocol - Bitcoin+EVM hybrid chain
• @midl-js - Official MIDL SDK

Resources

• Documentation
• MCP Protocol Spec
• MIDL Protocol Docs
• Claude Desktop
• Cursor IDE

License

MIT License - 100% open source.

Acknowledgments

Built for MIDL VibeHack 2026 hackathon (Feb 9-28, 2026).

Special thanks to:

• MIDL Protocol Team - For the hybrid chain architecture
• @midl-js - For the comprehensive SDK
• Anthropic - For Claude and MCP specification
• Community - For feedback and testing

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Website • Documentation • GitHub

MIDL MCP Server: Bring AI to Your Blockchain

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