Connect to JSON-RPC Services via OpenRPC

OpenRPC MCP Server gives an AI assistant the ability to call arbitrary JSON-RPC methods on any server and discover what methods a server exposes, using the OpenRPC specification's rpc.discover convention.

Use it when you're working with a JSON-RPC API and want Claude to call specific methods with parameters, or to first discover what methods and parameters a given JSON-RPC server supports before calling them. Do not use it for REST or GraphQL APIs - this server is scoped specifically to the JSON-RPC protocol and OpenRPC-compatible discovery.

• rpc_call: call an arbitrary JSON-RPC method by specifying the server URL, method name, and parameters, returning JSON-formatted results.
• rpc_discover: discover all available JSON-RPC methods on a given server using OpenRPC's rpc.discover specification.

Add to your Claude Desktop config (claude_desktop_config.json):

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

For local development, clone the repo and run npm install then npm run build (or npm run watch for auto-rebuild). Debug with the MCP Inspector via npm run inspector, which provides a browser-based debugging URL.

Developers working with JSON-RPC APIs who want Claude to discover and call available methods conversationally instead of manually crafting JSON-RPC requests.