Hedera Testnet Mirror Node MCP Server

This repository contains a Model Context Protocol (MCP) server that interfaces with the Hedera Testnet Mirror Node API. The server is built using FastMCP, a TypeScript framework for creating MCP servers. It utilises Zod schemas for input validation.

Features

• Endpoint Integration: Automatically converts Hedera Mirror Node APIs, defined in OpenAPI specification format, into MCP-compatible tools.

• Server-Sent Events (SSE) Support: Clients cannot connect to this MCP server over the SSE transport.

• Schema Validation: Ensures request parameters adhere to defined schemas using Zod.

Related MCP server: Skemati.ca MCP SSE Server

Prerequisites

Before running the server, ensure you have the following installed:

• Bun, or any other environment capable of running Typescript directly.

Installation

(1) Clone the repository

git clone https://github.com/hedera-dev/mirrornode-mcp-server

(2) Navigate to the project directory

cd mirrornode-mcp-server

(3) Install dependencies

npm install

Usage

To start the MCP server:

bun mcpServer.ts

Upon successful startup, you should see:

MCP server started

The server will be accessible via the configured SSE endpoint.

http://localhost:3333/hedera-testnet-mirror-node-api/sse

Project Structure

• mcpServer.ts: The entry point that initializes and starts the MCP server.

• openApiZod.ts: Contains Mirror Node API endpoint definitions and an API client using zodios (like axios augmented with zod schema definitions).

  • Note that this file has been programmatically generated using openapi-zod-client plus some manual modifications.

How It Works

(1) API Client Creation

An API client is created for the Hedera Testnet Mirror Node using the createApiClient function. The MCP server proxies between this HTTP API client and its own SSE transport.

(2) Endpoint Conversion:

Each endpoint definition from endpointDefinitions is processed by the convertZodiosToMcp function, which:

• Validates that the endpoint uses the GET method.

• Maps parameters to Zod schemas.

• Defines an execution function that makes the corresponding API call and returns the result.

• Registers the tool with the MCP server.

(3) Server Initialization:

The MCP server is started with SSE transport.

Dependencies

• FastMCP: Framework for building MCP servers.

• Zod: TypeScript-first schema declaration and validation library.

• openapi-zod-client: Generates Zodios code from an OpenAPI specification file.

Author

Brendan Graetz

Licence

MIT