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OpenRPC MCP Server

OpenRPC MCP Server

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github.com/shanejonasDeveloper Tools43Updated 79w ago
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About OpenRPC MCP Server

OpenRPC MCP Server is an MCP server that provides JSON-RPC calls through the OpenRPC specification. It is aimed at developers who want an AI client to discover and call methods on JSON-RPC services.

Key features

  1. 01Calls arbitrary JSON-RPC methods
  2. 02Takes server URL, method name and parameters
  3. 03Lists methods using the rpc.discover specification
  4. 04Returns results formatted as JSON

Use cases

  1. 01Letting an AI client explore methods offered by a JSON-RPC service
  2. 02Sending test calls to a JSON-RPC service and reviewing results

MCP support

The project runs as an MCP server and exposes two tools, rpc_call and rpc_discover, to MCP clients.

#openrpc#json-rpc#api-discovery

Configuration

Local server config is the same for every client. Copy it into your client’s MCP config file.

mcp.json · Universal config
{
  "mcpServers": {
    "openrpc-mpc-server": {
      "command": "npx",
      "args": [
        "-y",
        "openrpc-mcp-server"
      ]
    }
  }
}
Run commandnpx -y openrpc-mcp-server

Local servers need a runtime on your machine (e.g. Node.js 18+). Config file locations differ by client; see your client’s docs.

Packages
npmopenrpc-mcp-server

Tools

2

Saved tool list · updated 3w ago

ParameterTypeRequiredDescription
serverstringYesServer URL
methodstringYesJSON-RPC method name to call
paramsstringNoStringified Parameters to pass to the method

Details

From the project README

OpenRPC MCP Server

A Model Context Protocol (MCP) server that provides JSON-RPC functionality through OpenRPC.

https://github.com/user-attachments/assets/3447175a-f921-4ded-8250-b611edb2fb67

Features

Tools
  • rpc_call - Call arbitrary JSON-RPC methods
    • Specify server URL, method name, and parameters
    • Returns JSON-formatted results
  • rpc_discover - Discover available JSON-RPC methods
    • Uses OpenRPC's rpc.discover specification
    • Lists all methods on a given server

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "openrpc": {
      "command": "npx",
      "args": ["-y", "openrpc-mcp-server"]
    }
  }
}
Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

Comments

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An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.