eth-labels

Look up 170,000+ labeled crypto addresses and tokens across EVM chains (Ethereum, Base, Arbitrum, Optimism, BSC, and more). Identify who owns an address, search for labeled accounts, check balances, and discover token metadata — all via the eth-labels MCP server.

When to use

Use this skill when:

• User asks "who owns this address" or "what is this address"
• Looking up wallet labels (exchanges, protocols, DAOs, known entities)
• Identifying token contracts and metadata
• Searching for addresses by label/name
• Checking balances across EVM chains
• Researching crypto transactions or addresses

Setup

Install via GitHub (recommended)

Clone the repository and build the MCP server:

git clone https://github.com/dawsbot/eth-labels.git
cd eth-labels/mcp
npm install
npm run build

Then add to your MCP client config (e.g., Claude Desktop ~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "eth-labels": {
      "command": "node",
      "args": ["/path/to/eth-labels/mcp/dist/index.js"]
    }
  }
}

Replace /path/to/eth-labels with the actual path where you cloned the repo.

Alternative: Run directly from source

For development or testing, you can run the MCP server directly without building:

cd eth-labels/mcp
npx tsx index.ts

Add to MCP config:

{
  "mcpServers": {
    "eth-labels": {
      "command": "npx",
      "args": ["tsx", "/path/to/eth-labels/mcp/index.ts"]
    }
  }
}

Available tools (via MCP)

The MCP server provides these tools:

lookup_account

Look up an address to find its label and metadata.

Parameters:

• address (string, required): Ethereum address (0x...)
• chainId (number, optional): Chain ID to filter results (1=Ethereum, 8453=Base, 42161=Arbitrum, 10=Optimism, 56=BSC)

Returns: Array of account labels with chain info

lookup_token

Look up a token contract address to get metadata (name, symbol, website, image).

Parameters:

• address (string, required): Token contract address (0x...)
• chainId (number, optional): Chain ID to filter results

Returns: Array of token metadata

search_labels

Search for addresses by label/name (e.g., "Coinbase", "Uniswap").

Parameters:

• query (string, required): Search term (case-insensitive, partial match supported)
• chainId (number, optional): Chain ID to filter results
• limit (number, optional): Max results to return (default: 20)

Returns: Array of matching accounts

get_balance

Check ETH balance for an address on any EVM chain.

Parameters:

• address (string, required): Address to check
• chainId (number, optional): Chain ID (default: 1 for Ethereum mainnet)
• rpcUrl (string, optional): Custom RPC endpoint

Returns: Balance in ETH (formatted)

Supported chains

• Ethereum (chainId: 1)
• Base (chainId: 8453)
• Arbitrum (chainId: 42161)
• Optimism (chainId: 10)
• Binance Smart Chain (chainId: 56)

View all labeled accounts by chain at: https://eth-labels.com/accounts

Public API alternative

If you prefer REST API over MCP, use the public API:

• Swagger docs: https://eth-labels.com/swagger
• View labeled accounts: https://eth-labels.com/accounts?chainId=1

Data sources

Labels are scraped from blockchain explorers (Etherscan, Basescan, Arbiscan, Optimistic Etherscan, BscScan) and refreshed regularly.

Examples

Look up Vitalik's address:

lookup_account(address="0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", chainId=1)

Search for Coinbase addresses:

search_labels(query="Coinbase", limit=10)

Check balance on Base:

get_balance(address="0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", chainId=8453)

Repository

https://github.com/dawsbot/eth-labels

License

MIT