Web3 Assistant MCP

A secure blockchain smart contract interaction toolkit with multi-chain support.

Key Features

• 📑 Smart Contract ABI Analysis

• 📡 Contract Method Invocation (view/nonpayable/payable)

• 🔑 Local Wallet Address Management

• 🌐 Multi-chain Support

Related MCP server: Blockchain Payment MCP Server

Project Structure

web3-assistant-mcp/
├── src/
│   ├── common/
│   │   ├── clients/        # Blockchain client implementations
│   │   ├── constants/      # Network configurations
│   │   ├── services/       # Core services (contract, wallet)
│   │   └── utils/          # Helper functions
│   ├── tools/              # MCP tool implementations
│   └── types/              # TypeScript type definitions
├── test/                   # Test suites
├── .env.example            # Environment template
└── smithery.yaml           # MCP server configuration

Quick Start

Prerequisites

• Node.js 18+

• pnpm

• Configure environment variables (copy .env.example):

cp .env.example .env

Installation

pnpm install

Build

pnpm build

MCP Configuration Example

{
  "mcpServers": {
      "web3-assistant": {
          "command": "node",
          "args": [
              "***/dist/index.js"
          ],
          "env": {
              "ALCHEMY_KEY": "your_alchemy_key",
              "INFURA_KEY": "your_infura_key",
              "ANKR_KEY": "your_ankr_key",
              "PRIVATE_KEY": "your_wallet_private_key"
          }
      }
  }
}

Path Note: When using MCP locally, replace *** with the absolute path to your MCP server directory.

MCP Tools Documentation

🔍 analyze_contract_abi - ABI Analysis

{
  "abi": "[Contract ABI JSON string]"
}

Features:

• Parse contract ABI and list callable methods

• Auto-detect method types (view/pure/payable)

• Input/output parameter types

• State mutability

📞 call_contract - Contract Interaction

{
  "abi": "[Method ABI]",
  "networkName": "base|baseSepolia",
  "contractAddress": "0x...",
  "functionName": "methodName",
  "args": ["param1", param2],
  "value": 0.001 // ETH amount for payable methods (in ETH)
}

Supported Operations:

• Read contract state (view/pure)

• Send transactions (nonpayable)

• Token transfers (payable)

👜 local_wallet_address - Wallet Address

No parameters required:

{
  "address": "0x..."
}

Network Configuration

Pre-configured networks in src/common/constants/networks:

• mainnet: Ethereum Mainnet

• sepolia: Ethereum Sepolia

• base: Base Mainnet

• baseSepolia: Base Testnet

Security Guidelines

1. Private Key Management: Configure via environment variables

2. Transaction Verification: Confirm details for payable methods

3. Gas Limits: Automatic safe gas calculation