Base Blockchain

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)

# Install globally
npm install -g base-mcp

# Or install locally in your project
npm install base-mcp

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

base-mcp --init

Option 2: Install from Source

1. Clone this repository:

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

2. Install dependencies:

   npm install
   

3. Build the project:

   npm run build
   

4. Optionally, link it globally:

   npm 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:

npm 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:

   {
     "mcpServers": {
       "base-mcp": {
         "command": "npx",
         "args": ["-y", "base-mcp@latest"],
         "env": {
           "COINBASE_API_KEY_NAME": "your_api_key_name",
           "COINBASE_API_PRIVATE_KEY": "your_private_key",
           "SEED_PHRASE": "your seed phrase here",
           "COINBASE_PROJECT_ID": "your_project_id",
           "ALCHEMY_API_KEY": "your_alchemy_api_key",
           "PINATA_JWT": "your_pinata_jwt",
           "OPENROUTER_API_KEY": "your_openrouter_api_key",
           "CHAIN_ID": "optional_for_base_sepolia_testnet"
         },
         "disabled": false,
         "autoApprove": []
       }
     }
   }
   

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 ERC7

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README truncated. View full README on GitHub.