Etherscan MCP Tool

Instructions

Implementation Reference

• index.ts:307-349 (handler)

  The handler function that implements the core logic of the 'get_token_holders' tool by querying the Etherscan API for the top 10 token holders and formatting the response.
  async function handleGetTokenHolders(req: any, apiKey: string) { const chainId = req.params.arguments.chain_id; const tokenAddress = req.params.arguments.token_address; try { const response = await axios.get( `https://api.etherscan.io/v2/api?chainid=${chainId}&module=token&action=tokenholderlist&contractaddress=${tokenAddress}&page=1&offset=10&apikey=${apiKey}` ); if (response.data.status === "1") { const tokenHolders = response.data.result.map((holder: any) => { return `${holder.TokenHolderAddress}: ${holder.TokenHolderQuantity}`; }).join("\n"); return { content: [ { type: "text", text: `Token holders for token ${tokenAddress} on chain ${chainId}: ${tokenHolders}`, }, ], }; } else { return { content: [ { type: "text", text: `Failed to get token holders: ${response.data.message}`, }, ], }; } } catch (error) { return { content: [ { type: "text", text: `Failed to get token holders: ${error}`, }, ], }; } }
• index.ts:154-171 (schema)

  The ToolDefinition object defining the schema, name, description, and input parameters for the 'get_token_holders' tool.
  const getTokenHolders: ToolDefinition = { name: "get_token_holders", description: "Get the token holders for a given token address", inputSchema: { type: "object", properties: { chain_id: { type: "integer", description: "The chain ID", }, token_address: { type: "string", description: "The address of the token", }, }, required: ["chain_id", "token_address"], }, };
• index.ts:487-488 (registration)

  The switch case in the main tool handler that routes calls to 'get_token_holders' to its specific handler function.
  case getTokenHolders.name: return await handleGetTokenHolders(req, apiKey);
• index.ts:221-222 (registration)

  Registration of the tool definition in the toolDefinitions map used by the MCP server.
  [getTokenHolders.name]: getTokenHolders, [getTokenHoldersCount.name]: getTokenHoldersCount
• index.ts:509-511 (registration)

  The server capabilities section that registers all tool definitions, including 'get_token_holders', for the MCP protocol.
  capabilities: { tools: toolDefinitions, }