OpenRPC MCP Server (Updated)

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

> Note: This is an updated fork of the original openrpc-mcp-server by shanejonas. The primary improvement is the updated @modelcontextprotocol/sdk dependency (v1.18.1) for compatibility with newer MCP clients.

Original Work

This package is based on the excellent work by:
- Original Author: shanejonas
- Original Repository: https://github.com/shanejonas/openrpc-mpc-server
- Original npm Package: openrpc-mcp-server

What's Updated

- ✅ Updated @modelcontextprotocol/sdk from v0.6.0 to v1.18.1 for compatibility with newer MCP clients
- ✅ Maintained full backward compatibility with existing features

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

Features

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- 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:

``bash
npm install
`

Build the server:

`bash
npm run build
`

For development with auto-rebuild:

`bash
npm run watch
`

Installation

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Install the updated package:

`bash
npm install -g openrpc-mcp-server-updated
`

Or use with npx:

`bash
npx openrpc-mcp-server-updated
`

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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

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

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

`bash
npm run inspector
``

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