Base MCP Server 🔵

A Model Context Protocol (MCP) server that provides onchain tools for AI applications like Claude Desktop and Cursor, allowing them to interact with the Base Network and Coinbase API.

Overview

This MCP server extends any MCP client's capabilities by providing tools to do anything on Base:

• Retrieve wallet addresses
• List wallet balances
• Transfer funds between wallets
• Deploy smart contracts
• Interact with Morpho vaults for onchain lending
• Call contract functions
• Onramp funds via Coinbase
• Manage ERC20 tokens
• List and transfer NFTs (ERC721 and ERC1155)
• Buy OpenRouter credits with USDC
• Resolve Farcaster usernames to Ethereum addresses

The server interacts with Base, powered by Base Developer Tools and AgentKit.

Extending Base MCP with 3P Protocols, Tools, and Data Sources

Base MCP is designed to be extensible, allowing you to add your own third-party protocols, tools, and data sources. This section provides an overview of how to extend the Base MCP server with new capabilities.

Adding New Tools

If you want to add a new tool to the Base MCP server, follow these steps:

1. Create a new directory in the src/tools directory for your tool
2. Implement the tool following the existing patterns:
   • index.ts: Define and export your tools. Tools are defined as AgentKit ActionProviders.
   • schemas.ts: Define input schemas for your tools
   • types.ts: Define types required for your tools
   • utils.ts: Utilities for your tools
3. Add your tool to the list of available tools in src/main.ts
4. Add documentation for your tool in the README.md
5. Add examples of how to use your tool in examples.md
6. Write tests for your tool

Project Structure

The Base MCP server follows this structure for tools:

src/
├── tools/
│   ├── [TOOL_NAME]/ <-------------------------- ADD DIR HERE
│   │   ├── index.ts (defines and exports tools)
│   │   ├── schemas.ts (defines input schema)
│   └── utils/ (shared tool utilities)

Best Practices for Tool Development

When developing new tools for Base MCP:

• Follow the existing code style and patterns
• Ensure your tool has a clear, focused purpose
• Provide comprehensive input validation
• Include detailed error handling
• Write thorough documentation
• Add examples demonstrating how to use your tool
• Include tests for your tool

For more detailed information on contributing to Base MCP, including adding new tools and protocols, see the CONTRIBUTING.md file.

Prerequisites

• Node.js (v16 or higher)
• npm or yarn
• Coinbase API credentials (API Key Name and Private Key)
• A wallet seed phrase
• Coinbase Project ID (for onramp functionality)
• Alchemy API Key (required for NFT functionality)
• Optional: OpenRouter API Key (for buying OpenRouter credits)

Installation

Option 1: Install from npm (Recommended)

1# Install globally
2npm install -g base-mcp
3
4# Or install locally in your project
5npm install base-mcp

Once the package is installed, you can configure clients with the following command:

1base-mcp --init

Option 2: Install from Source

1. Clone this repository:

   1git clone https://github.com/base/base-mcp.git
   2cd base-mcp

2. Install dependencies:

   1npm install

3. Build the project:

   1npm run build

4. Optionally, link it globally:

   1npm link

Configuration

Create a .env file with your credentials:

# Coinbase API credentials
# You can obtain these from the Coinbase Developer Portal: https://cdp.coinbase.com/
COINBASE_API_KEY_NAME=your_api_key_name
COINBASE_API_PRIVATE_KEY=your_private_key

# Wallet seed phrase (12 or 24 words)
# This is the mnemonic phrase for your wallet
SEED_PHRASE=your seed phrase here

# Coinbase Project ID (for onramp functionality)
# You can obtain this from the Coinbase Developer Portal
COINBASE_PROJECT_ID=your_project_id

# Alchemy API Key (required for NFT functionality)
# You can obtain this from https://alchemy.com
ALCHEMY_API_KEY=your_alchemy_api_key

# OpenRouter API Key (optional for buying OpenRouter credits)
# You can obtain this from https://openrouter.ai/keys
OPENROUTER_API_KEY=your_openrouter_api_key

# Chain ID (optional for Base Sepolia testnet)
# Use 84532 for Base Sepolia testnet
# You do not have to include this if you want to use Base Mainnet
CHAIN_ID=your_chain_id

# Neynar API Key (required for Farcaster functionality)
# You can obtain this from https://neynar.com
NEYNAR_API_KEY=your_neynar_api_key

Testing

Test the MCP server to verify it's working correctly:

1npm test

This script will verify that your MCP server is working correctly by testing the connection and available tools.

Examples

See the examples.md file for detailed examples of how to interact with the Base MCP tools through Claude.

Integration with Claude Desktop

To add this MCP server to Claude Desktop:

1. Create or edit the Claude Desktop configuration file at:

   • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
   • Windows: %APPDATA%\Claude\claude_desktop_config.json
   • Linux: ~/.config/Claude/claude_desktop_config.json

You can easily access this file via the Claude Desktop app by navigating to Claude > Settings > Developer > Edit Config.

2. Add the following configuration:

   1{
   2  "mcpServers": {
   3    "base-mcp": {
   4      "command": "npx",
   5      "args": ["-y", "base-mcp@latest"],
   6      "env": {
   7        "COINBASE_API_KEY_NAME": "your_api_key_name",
   8        "COINBASE_API_PRIVATE_KEY": "your_private_key",
   9        "SEED_PHRASE": "your seed phrase here",
   10        "COINBASE_PROJECT_ID": "your_project_id",
   11        "ALCHEMY_API_KEY": "your_alchemy_api_key",
   12        "PINATA_JWT": "your_pinata_jwt",
   13        "OPENROUTER_API_KEY": "your_openrouter_api_key",
   14        "CHAIN_ID": "optional_for_base_sepolia_testnet"
   15      },
   16      "disabled": false,
   17      "autoApprove": []
   18    }
   19  }
   20}

3. Restart Claude Desktop for the changes to take effect.

Available Tools

get-address

Retrieves the address for your wallet.

Example query to Claude:

"What's my wallet address?"

list-balances

Lists all balances for your wallet.

Example query to Claude:

"Show me my wallet balances."

transfer-funds

Transfers funds from your wallet to another address.

Parameters:

• destination: The address to which to transfer funds
• assetId: The asset ID to transfer
• amount: The amount of funds to transfer

Example query to Claude:

"Transfer 0.01 ETH to 0x1234567890abcdef1234567890abcdef12345678."

deploy-contract

Deploys a smart contract to the blockchain.

Parameters:

• constructorArgs: The arguments for the contract constructor
• contractName: The name of the contract to deploy
• solidityInputJson: The JSON input for the Solidity compiler containing contract source and settings
• solidityVersion: The version of the solidity compiler

Example query to Claude:

"Deploy a simple ERC20 token contract for me."

check-address-reputation

Checks the reputation of an address.

Parameters:

• address: The Ethereum address to check

Example query to Claude:

"What's the reputation of 0x1234567890abcdef1234567890abcdef12345678?"

get_morpho_vaults

Gets the vaults for a given asset on Morpho.

Parameters:

• assetSymbol: Asset symbol by which to filter vaults (optional)

Example query to Claude:

"Show me the available Morpho vaults for USDC."

call_contract

Calls a contract function on the blockchain.

Parameters:

• contractAddress: The address of the contract to call
• functionName: The name of the function to call
• functionArgs: The arguments to pass to the function
• abi: The ABI of the contract
• value: The value of ETH to send with the transaction (optional)

Example query to Claude:

"Call the balanceOf function on the contract at 0x1234567890abcdef1234567890abcdef12345678."

get_onramp_assets

Gets the assets available for onramping in a given country/subdivision.

Parameters:

• country: ISO 3166-1 two-digit country code string representing the purchasing user's country of residence
• subdivision: ISO 3166-2 two-digit country subdivision code (required for US)

Example query to Claude:

"What assets can I onramp in the US, specifically in New York?"

onramp

Gets a URL for onramping funds via Coinbase.

Parameters:

• amountUsd: The amount of funds to onramp
• assetId: The asset ID to onramp

Example query to Claude:

"I want to onramp $100 worth of ETH."

erc20_balance

Gets the balance of an ERC20 token.

Parameters:

• contractAddress: The address of the ERC20 contract

Example query to Claude:

"What's my balance of the token at 0x1234567890abcdef1234567890abcdef12345678?"

erc20_transfer

Transfers an ERC20 token to another address.

Parameters:

• contractAddress: The address of the ERC20 contract
• toAddress: The address of the recipient
• amount: The amount of tokens to transfer

Example query to Claude:

"Transfer 10 USDC to 0x1234567890abcdef1234567890abcdef12345678."

list_nfts

Lists NFTs owned by a specific address.

Parameters:

• ownerAddress: The address of the owner whose NFTs to list
• limit: Maximum number of NFTs to return (default: 50)

Example query to Claude:

"Show me the NFTs owned by 0x89A93a48C6Ef8085B9d07e46AaA96DFDeC717040."

transfer_nft

Transfers an NFT to another address. Supports both ERC721 and ERC1155 standards.

Parameters:

• contractAddress: The address of the NFT contract
• tokenId: The token ID of the NFT to transfer
• toAddress: The address of the recipient
• amount: The amount to transfer (only used for ERC1155, default: 1)

Example query to Claude:

"Transfer my NFT with contract 0x3F06FcF75f45F1bb61D56D68fA7b3F32763AA15c and token ID 56090175025510453004781233574040052668718235229192064098345825090519343038548 to 0x1234567890abcdef1234567890abcdef12345678."

buy_openrouter_credits

Buys OpenRouter credits with USDC.

Parameters:

• amountUsd: The amount of credits to buy, in USD

Example query to Claude:

"Buy $20 worth of OpenRouter credits."

Security Considerations

• The configuration file contains sensitive information (API keys and seed phrases). Ensure it's properly secured and not shared.
• Consider using environment variables or a secure credential manager instead of hardcoding sensitive information.
• Be cautious when transferring funds or deploying contracts, as these operations are irreversible on the blockchain.
• When using the onramp functionality, ensure you're on a secure connection.
• Verify all transaction details before confirming, especially when transferring funds or buying credits.

Troubleshooting

If you encounter issues:

1. Check that your Coinbase API credentials are correct
2. Verify that your seed phrase is valid
3. Ensure you're on the correct network (Base Mainnet)
4. Check the Claude Desktop logs for any error messages

License

MIT License

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

For detailed guidelines on contributing to Base MCP, including:

• Reporting bugs
• Suggesting enhancements
• Development setup
• Coding standards
• Adding new tools, protocols, and data sources (see also the Extending Base MCP section above)
• Testing requirements
• Documentation standards

Please refer to our comprehensive CONTRIBUTING.md guide.

Basic contribution steps:

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

Please make sure your code follows the existing style and includes appropriate tests.