MaStR MCP Server

MaStR MCP Server is an open-source Model Context Protocol (MCP) server that connects Claude Desktop, Cowork, and Claude Code to the German energy market master data register (Marktstammdatenregister). It provides both public (JSON) and credentialed (SOAP) API access to a wide range of German energy infrastructure, actor, and facility data for search, filtering, and retrieval, supporting data-driven use cases in energy market research, analysis, and applications requiring up-to-date German energy market master data.