MCP ABI

Package: @iqai/mcp-abi Purpose: Smart contract ABI interactions for Ethereum-compatible blockchains

Features

Dynamically generates MCP tools based on contract ABI
Supports both read (view/pure) and write functions
Automatic tool naming with contract prefixes
Compatible with any Ethereum-compatible blockchain
Comprehensive error handling and transaction management

Available Tools

The server automatically creates tools for each function in the provided ABI:

Read Functions: Query contract state without transactions
- Example: ERC20_BALANCE_OF, ERC20_TOTAL_SUPPLY, ERC20_NAME
Write Functions: Execute state-changing transactions
- Example: ERC20_TRANSFER, ERC20_APPROVE, ERC20_MINT

Environment Variables

Variable	Description	Required
`WALLET_PRIVATE_KEY`	Private key for transaction signing	For write functions
`CONTRACT_ABI`	JSON string of the contract's ABI	Yes
`CONTRACT_ADDRESS`	Deployed contract address	Yes
`CONTRACT_NAME`	Friendly name for tool prefixes	Optional (defaults to "CONTRACT")
`CHAIN_ID`	Blockchain network chain ID	Optional (defaults to Fraxtal - 252)
`RPC_URL`	Custom RPC endpoint URL	Optional

Configuration Example

{
  "mcpServers": {
    "smart-contract-abi": {
      "command": "pnpm",
      "args": ["dlx", "@iqai/mcp-abi"],
      "env": {
        "WALLET_PRIVATE_KEY": "your_wallet_private_key_here",
        "CONTRACT_ABI": "[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"}]",
        "CONTRACT_ADDRESS": "0xaB195B090Cc60C1EFd4d1cEE94Bf441F5931C01b",
        "CONTRACT_NAME": "ERC20",
        "CHAIN_ID": "252",
        "RPC_URL": "https://rpc.frax.com"
      }
    }
  }
}

Usage Examples

ERC20 Token Contract

Check balance: ERC20_BALANCE_OF with address parameter
Transfer tokens: ERC20_TRANSFER with recipient and amount
Check allowances: ERC20_ALLOWANCE with owner and spender
Approve spending: ERC20_APPROVE with spender and amount

NFT Contract (ERC721)

Check ownership: NFT_OWNER_OF with token ID
Transfer NFT: NFT_TRANSFER_FROM with from, to, and token ID
Mint token: NFT_MINT with recipient and metadata

Response Examples

Read Function Response:

✅ Successfully called balanceOf
Result: "1000000000000000000"

Write Function Response:

✅ Successfully executed transfer
Transaction hash: 0x123abc...
You can view this transaction on the blockchain explorer.

Error Handling

Common Errors

The server provides comprehensive error handling for various blockchain interaction scenarios.

🚨 Invalid function arguments - "❌ Error parsing arguments: [specific error]"
🔄 Transaction failures - "❌ Error with [function]: [error message]"
🔒 Access control errors - "❌ Error with [function]: execution reverted"
🌐 Network errors - "❌ Error with [function]: network connection failed"
💲 Insufficient funds - "❌ Error with [function]: insufficient funds for gas"
📄 ABI parsing errors - "❌ Invalid ABI format: [specific error]"
🏠 Contract address errors - "❌ Invalid contract address: [address]"

MCP ABI

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