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Web Builder

mcp.ucai.tech — Generate MCP servers directly in your browser, with built-in security scanning and plain English contract explanations.

Features

🛡️ Security Scanner

Before creating an MCP server, the security scanner analyzes the contract for 50+ risk patterns:

  • Critical risks: selfdestruct, arbitrary delegatecall, tx.origin auth
  • High risks: Hidden mint functions, pause/freeze, blacklists, adjustable fees
  • Medium risks: Transfer restrictions, proxy patterns, assembly code
  • Low risks: Timestamp dependence, unchecked math

The scanner produces a risk score (0-100) and categorizes the contract:

Score Level Meaning
80-100 🟢 Safe Low risk, standard patterns
60-79 🟡 Caution Some concerns, review carefully
40-59 🟠 Warning Multiple risks detected
0-39 🔴 Danger High risk, proceed with extreme caution

📖 Contract Whisperer

The Contract Whisperer explains what a smart contract does in plain English:

  • Summary: One-sentence description
  • Main functions: What each function does
  • Permissions: Who can do what (owner, admin, anyone)
  • Tokenomics: Mintable, burnable, fees
  • Risk summary: Plain English explanation of risks

⚡ Pro Templates

Pre-built multi-contract bundles for advanced use cases:

Template Contracts Use Case
Flash Loan Playground Aave V3, Uniswap Flash loan arbitrage
Multi-DEX Arbitrage Uniswap, Sushi, Curve Cross-DEX price comparison
Yield Aggregator Intel Yearn, Convex, Aura Yield farming opportunities
Liquidation Bot Intel Aave, Compound Liquidation monitoring
Base DeFi Starter Aerodrome, BaseSwap L2 DeFi on Base
Arbitrum Perps Suite GMX, Camelot Perpetual futures

🔧 Custom Contract Builder

  1. Connect wallet (optional) — Saves your servers to localStorage
  2. Select network — Ethereum, Polygon, Arbitrum, Base, Optimism, BSC, Avalanche
  3. Enter contract address — Or paste an ABI
  4. Fetch ABI — Automatically retrieves from block explorer
  5. Security scan — Auto-runs after fetching ABI
  6. Download — ZIP with server.py, requirements.txt, README.md

Usage

Quick Start

  1. Go to mcp.ucai.tech
  2. Enter a contract address (e.g., 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D for Uniswap)
  3. Click Fetch ABI
  4. Review the security scan results
  5. Click Generate & Download Server
  6. Unzip and follow the included README

Using Pro Templates

  1. Click the ⚡ Pro Templates tab
  2. Browse templates by category
  3. Click Generate X-Contract Bundle
  4. Wait for ABIs to be fetched
  5. Download the ZIP containing all servers

Share a pre-filled form with anyone:

https://mcp.ucai.tech?address=0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D&network=ethereum

Parameters: - address — Contract address - network — Network ID (ethereum, polygon, arbitrum, base, optimism, bsc, avalanche)

Dark/Light Mode

Toggle between light and dark themes using the sun/moon switch in the header.

Export/Import Servers

If you've connected a wallet, your generated servers are saved to localStorage:

  • Export: Download your server list as JSON
  • Import: Restore servers from a JSON backup

Downloaded Files

Each generated server includes:

my-contract-mcp-server/
├── server.py           # MCP server implementation
├── requirements.txt    # Python dependencies
├── README.md           # Setup instructions
└── abi.json            # Contract ABI

server.py

A complete MCP server with:

  • All view/read functions as tools
  • All write functions as tools (with simulation)
  • Events as queryable resources
  • Proper type mappings (address, uint256, bytes, etc.)

requirements.txt

mcp>=1.0.0
web3>=6.0.0
python-dotenv>=1.0.0

README.md

Step-by-step setup instructions:

  1. Install dependencies
  2. Set RPC_URL environment variable
  3. Add to Claude Desktop config
  4. Example prompts to try

Supported Networks

Network Explorer API
Ethereum Mainnet Etherscan
Polygon Polygonscan
Arbitrum One Arbiscan
Base Basescan
Optimism Optimistic Etherscan
BNB Smart Chain BSCScan
Avalanche C-Chain Snowtrace
Custom RPC Manual ABI entry required

API Routes

The web builder uses the following API endpoints:

POST /api/analyze

Analyzes a contract for security risks and generates explanations.

Request: 

{
  "address": "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D",
  "network": "ethereum"
}

Response: 

{
  "success": true,
  "address": "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D",
  "contractName": "UniswapV2Router02",
  "isVerified": true,
  "isProxy": false,
  "securityReport": {
    "overallScore": 85,
    "riskLevel": "safe",
    "risks": [...],
    "positives": [...]
  },
  "explanation": {
    "summary": "Uniswap V2 Router - Decentralized exchange",
    "purpose": "...",
    "mainFunctions": [...],
    "permissions": [...],
    "riskSummary": "..."
  }
}

Privacy

  • No backend storage — All server configs are stored in your browser's localStorage
  • Wallet optional — Connect only if you want to save servers across sessions
  • No tracking — We don't track which contracts you analyze
  • Open source — View the code on GitHub