InfraNode

InfraNode is a free, keyless REST API for open public data on 84 German cities: weather (DWD), severe-weather warnings, air quality (UBA), public transit and realtime departures, traffic, water levels, energy and the SMARD electricity market, land values (BORIS), demographics, elections and more, behind one consistent JSON interface with per-field source, license and required attribution. Open source (Apache-2.0), no API key, no signup. An MCP server is also available.