MidPay Server

MidPay MCP Server is a Model Context Protocol implementation that provides AI models with access to an escrow payment system. It enables AI-powered transaction management, account monitoring, and blockchain operations.

Features

• MCP Protocol: Model Context Protocol server for AI integration
• Blockchain Integration: Immutable transaction records using proof-of-work
• Digital Signatures: RSA-based cryptographic verification of transactions
• Escrow Payments: Secure fund transfers with an escrow holding system
• Transaction Management: Create, complete, confirm, and cancel transactions
• Account Tracking: Monitor balances for both parties and the escrow account
• Transaction History: Blockchain-verified transaction history

Architecture

AI Model/Client
       ↓
MCP Protocol (stdio)
       ↓
MidPay MCP Server
       ↓
MidPay Core System
       ↓
[Bank JSON Files, MongoDB, Blockchain]

Getting Started

Prerequisites

• Python 3.6 or higher
• Required packages: cryptography, pymongo, python-dotenv

Installation

1. Clone the repository:

   git clone <repository-url>
   cd midpay-mcp
   

2. Install dependencies:

   pip install -r requirements.txt
   

3. Run the MCP Server:

   Simple MCP Server:

   python simple_mcp_server.py
   

   Or use the startup scripts:

   • Windows: start_mcp_server.bat
   • Linux/Mac: ./start_mcp_server.sh

4. Test the MCP Server:

   python test_mcp_server.py
   

MCP Resources

The MCP server provides real-time access to:

• midpay://accounts - Current account balances and escrow status
• midpay://blockchain - Blockchain verification and statistics
• midpay://transactions/history - Complete transaction history

MCP Tools

The MCP server provides the following tools for AI interaction:

• create_transaction - Create new escrow transactions
• get_transaction_status - Check transaction details
• mark_service_completed - Mark services as completed
• confirm_completion - Confirm completion and release funds
• cancel_transaction - Cancel transactions
• get_balance - Get user account balances
• verify_blockchain - Verify blockchain integrity
• get_transaction_history - Get filtered transaction history

Configuration

Environment Variables

Create a .env file in the project root with optional MongoDB configuration:

MONGODB_URI=mongodb://localhost:27017
# or for MongoDB Atlas:
# MONGODB_URI=mongodb+srv://username:password

MCP Client Configuration

For integration with MCP-compatible clients, add to your configuration:

{
  "mcpServers": {
    "midpay": {
      "command": "python",
      "args": ["simple_mcp_server.py"],
      "cwd": "/path/to/midpay-mcp"
    }
  }
}

File Structure

• simple_mcp_server.py: Main MCP server implementation
• midpay.py: Core MidPay escrow system logic
• blockchain.py: Blockchain implementation with digital signatures
• test_mcp_server.py: Test suite for the MCP server
• start_mcp_server.bat: Windows startup script
• start_mcp_server.sh: Linux/Mac startup script
• requirements.txt: Python dependencies
• A_bank.json: Party A's account balance and transaction history
• B_bank.json: Party B's account balance and transaction history
• mcp_config.json: MCP client configuration example
• INTEGRATION_GUIDE.md: Detailed integration instructions
• MCP_README.md: MCP server overview

Usage Examples

Basic Transaction Flow

1. Create a transaction:

   {
     "method": "tools/call",
     "params": {
       "name": "create_transaction",
       "arguments": {
         "amount": 500,
         "description": "Website development"
       }
     }
   }
   

2. Mark service completed:

   {
     "method": "tools/call",
     "params": {
       "name": "mark_service_completed",
       "arguments": {"transaction_id": "1720000000"}
     }
   }
   

3. Confirm completion:

   {
     "method": "tools/call",
     "params": {
       "name": "confirm_completion",
       "arguments": {"transaction_id": "1720000000"}
     }
   }
   

Account Monitoring

Check account balances:

{
  "method": "resources/read",
  "params": {"uri": "midpay://accounts"}
}

Verify blockchain integrity:

{
  "method": "tools/call",
  "params": {
    "name": "verify_blockchain",
    "arguments": {}
  }
}

Documentation

For detailed information, see:

• MCP_README.md - MCP server overview and features
• INTEGRATION_GUIDE.md - Complete integration instructions
• test_mcp_server.py - Example usage and testing

Security Notes

This is a simulation designed for AI integration and not intended for real-world financial transactions. While it demonstrates blockchain concepts, a production system would require additional security measures including:

• User authentication and authorization
• Secure key storage
• Network communication encryption
• Additional validation and security checks

License

MIT License