Mono Banking MCP Server

A comprehensive Model Context Protocol (MCP) server for Nigerian banking operations using the Mono Open Banking API. Features integrated webhook support for real-time banking events and seamless deployment on FastMCP Cloud.

Table of Contents

• Key Features
• Architecture
• Technologies Used
• Project Structure
• Webhook Integration
• Quick Start
• Usage
• Available Banking Tools
• Contributing

Key Features

• Complete Banking Operations - Account management, payments, BVN verification
• Real-time Webhooks - Integrated webhook endpoints for live banking events
• AI Assistant Ready - Seamless integration with Claude, ChatGPT, and other AI assistants
• Cloud Deployment - Ready for FastMCP Cloud with automatic scaling
• Enterprise Security - HMAC signature verification and secure API handling
• Event Monitoring - Built-in webhook event storage and debugging tools

Architecture

sequenceDiagram
    participant User as 👤 User
    participant AI as 🤖 AI Assistant<br/>(Claude/ChatGPT)
    participant MCP as ⚡ MCP Server<br/>(FastMCP + Webhooks)
    participant Client as 🔗 Mono Client<br/>(httpx)
    participant API as 🏦 Mono API<br/>(Nigerian Banks)
    participant Webhook as 📡 Webhook Events

    User->>AI: "Check my account balance"
    AI->>MCP: list_tools()
    MCP-->>AI: 12 banking tools + webhook monitoring

    AI->>MCP: get_account_balance(account_id)
    MCP->>Client: get_account_balance(account_id)
    Client->>API: GET /accounts/{id}/balance
    API-->>Client: {"balance": 50000, "currency": "NGN"}
    Client-->>MCP: Account balance data
    MCP-->>AI: {"success": true, "balance": "₦500.00"}
    AI-->>User: "Your account balance is ₦500.00"

    Note over Webhook,MCP: Real-time Events
    API->>MCP: POST /mono/webhook (account.updated)
    MCP->>MCP: Verify HMAC signature
    MCP->>MCP: Store event in database

Technologies Used

• Python 3.12+ - Modern Python with async/await support
• FastMCP 2.12+ - Simplified MCP server with custom route support
• Starlette - ASGI framework for webhook endpoints
• httpx - Modern async HTTP client for API communication
• SQLAlchemy - Database ORM for webhook event storage
• Mono Open Banking API v2 - Nigerian banking infrastructure
• python-dotenv - Environment variable management
• uv - Fast Python package manager (recommended)

Project Structure

mono-banking-mcp/
├── mono_banking_mcp/           # Main package
│   ├── server.py                 # FastMCP server with 12 tools + webhook endpoints
│   ├── mono_client.py            # Mono API client with async httpx
│   └── database.py               # SQLAlchemy database for webhook events storage
├── tests/                     # Comprehensive test suite with webhook integration tests
│   ├── conftest.py               # Test configuration and fixtures
│   └── test_mono_banking.py      # Unit and integration tests
├── pyproject.toml            # Modern Python project configuration (uv-based)
├── uv.lock                   # Dependency lock file with FastMCP 2.12+
├── pytest.ini               # Test configuration and markers
├── Makefile                  # Development workflow automation with webhook commands
├── README.md                 # This comprehensive documentation
└── .env.example              # Environment variables template

Webhook Integration

Real-time Event Processing

The server includes integrated webhook support for real-time banking events:

graph LR
    A[Mono API] -->|POST /mono/webhook| B[FastMCP Server]
    B -->|HMAC Verify| C[Signature Check]
    C -->|✅ Valid| D[Store Event]
    C -->|❌ Invalid| E[Reject]
    D --> F[SQLite Database]
    F --> G[get_webhook_events Tool]
    G --> H[AI Assistant]

Key Integration Points

• /mono/webhook - Webhook endpoint for real-time Mono events
• /health - Health check endpoint for monitoring

Supported Webhook Events

• account.connected - New account linked
• account.updated - Account information changed
• account.unlinked - Account disconnected
• job.completed - Data sync completed
• job.failed - Data sync failed

Security Features

• HMAC-SHA256 Signature Verification - Ensures webhook authenticity
• Environment-based Secrets - Secure credential management
• Request Validation - Malformed request rejection
• Event Storage - Audit trail for all webhook events

Quick Start

Ready to use immediately! Connect your AI assistant to:

https://mono-banking-mcp.fastmcp.app/mcp

Available Endpoints

• MCP Server: https://mono-banking-mcp.fastmcp.app/mcp
• Webhook Endpoint: https://mono-banking-mcp.fastmcp.app/mono/webhook
• Health Check: https://mono-banking-mcp.fastmcp.app/health

Usage

Claude Desktop Integration

Add to your Claude Desktop configuration (~/.config/claude-desktop/config.json):

{
  "mcpServers": {
    "mono-banking": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-fetch", "https://mono-banking-mcp.fastmcp.app/mcp"]
    }
  }
}

Usage Examples

Once connected to an AI assistant (Claude, Gemini, etc.), you can use natural language commands:

Account Management

• "List all my linked bank accounts"
• "Show me the balance for account abc123"
• "Get detailed information for my GTBank account"
• "Show me the last 20 transactions for account xyz789"

Payment Operations

• "Verify the account name for 0123456789 at GTBank (code 058)"
• "Initiate a payment of ₦5000 to account 1234567890 at Access Bank for John Doe"
• "Check the status of payment reference PAY_ABC123"

Banking Information

• "Show me all supported Nigerian banks and their codes"
• "Look up BVN 12345678901 for identity verification"
• "Help a new customer link their bank account"

Complete Workflow Example

1. "Show me all Nigerian banks" - Get bank codes
2. "Verify account 1234567890 at Access Bank" - Confirm recipient
3. "Initiate payment of ₦10000 to verified account for rent payment" - Start payment
4. "Check payment status for the reference you just gave me" - Verify completion

Available Banking Tools

The server provides these comprehensive banking tools (12 total):

Core Banking Operations

Tool	Description	Parameters
list_linked_accounts	List all linked bank accounts	None
get_account_balance	Get current account balance	account_id
get_account_info	Get basic account information	account_id
get_account_details	Get comprehensive account details including BVN	account_id
get_transaction_history	Retrieve transaction records with pagination	account_id, limit, page
verify_account_name	Verify recipient account details before payments	account_number, bank_code
initiate_payment	Start a payment via Mono DirectPay	amount, recipient_account_number, recipient_bank_code, customer info
verify_payment	Check payment status using reference	reference
get_nigerian_banks	List all supported Nigerian banks with codes	None
lookup_bvn	Perform BVN identity verification	bvn, scope
initiate_account_linking	Start account linking process for new customers	customer_name, customer_email

Contributing

Contributions to the Mono Banking MCP Server are welcome! For questions or help getting started, please open an issue.

Development Workflow

Quick Start for Contributors:

# Fork and clone the repository
git clone https://github.com/YOUR_USERNAME/mono-banking-mcp.git
cd mono-banking-mcp

# Set up development environment
uv sync
uv pip install -e .

# Verify installation with webhook support
python -c "from mono_banking_mcp.server import mcp; print('✅ Package installed successfully')"

# Run comprehensive tests
make test-all

# Create feature branch and start developing
git checkout -b feature/your-feature-name

# Test your changes
make test-webhook  # Test webhook functionality
make tools         # Verify all 12 tools are working