Sub Killer MCP Server

MCP server for Dead Subscription Killer — scan wallets, detect crypto subscriptions, manage approvals on Monad.

The first MCP server for blockchain subscription management.

What Is This?

An MCP (Model Context Protocol) server that lets AI agents (Claude, Cursor, Windsurf, etc.) scan wallets for forgotten token approvals and subscriptions on the Monad blockchain.

Use Cases

• "Scan my wallet for risky approvals" — agent calls scan_wallet

• "What is this spender address?" — agent calls identify_spender

• "How much would I save on Monad vs Ethereum?" — agent calls estimate_gas_savings

• "Do a security audit of my wallet" — agent uses security_audit prompt

Related MCP server: Monad MCP Tutorial

Tools

Resources

Prompts

Setup

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "sub-killer": {
      "command": "node",
      "args": ["/path/to/sub-killer-mcp/src/index.js"]
    }
  }
}

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "sub-killer": {
      "command": "node",
      "args": ["/path/to/sub-killer-mcp/src/index.js"]
    }
  }
}

With npx (after publishing)

{
  "mcpServers": {
    "sub-killer": {
      "command": "npx",
      "args": ["-y", "sub-killer-mcp"]
    }
  }
}

Install & Run

npm install
node src/index.js

Test

node src/test.js

Known Protocols Database

Includes 40+ known DeFi protocols across categories:

• DEX: Uniswap, SushiSwap, PancakeSwap, 1inch

• Lending: Aave, Compound

• Staking: Lido, Rocket Pool, Coinbase

• NFT: OpenSea, Blur

• Derivatives: dYdX, GMX

• Bridges: Base, Optimism, Arbitrum

Architecture

sub-killer-mcp/
├── src/
│   ├── index.js          # MCP server entry point
│   ├── test.js            # Test suite
│   ├── tools/
│   │   └── index.js       # Tool definitions & handlers
│   ├── lib/
│   │   └── scanner.js     # Blockchain scanner (viem)
│   └── data/
│       └── protocols.js   # Known protocols DB
├── package.json
└── README.md

Why Monad?

Batch-cancelling 10 subscriptions costs ~$300 on Ethereum. On Monad: $0.01.

License

MIT