Open data API for Chemnitz

Name: InfraNode: Open data for Chemnitz
Creator: InfraNode
License: https://www.govdata.de/dl-de/by-2-0

Open data for Chemnitz (Sachsen) through a free, keyless REST API: weather, air quality, electricity price and more, delivered as consistent JSON with source and license on every response. No API key, no sign-up.

All InfraNode GPTs.

City	Chemnitz
State	Sachsen
Population	250,681
API slug	`chemnitz`
Coverage	Auto (AGS and geo-based)

Data with a guide for Chemnitz

These data types have an in-depth guide; all are retrievable for Chemnitz via the slug:

Weather API for German cities /api/v1/cities/chemnitz/weather
Air quality API for German cities /api/v1/cities/chemnitz/air-uba
Electricity price API for Germany /api/v1/cities/chemnitz/power-price
Solar API for German cities /api/v1/cities/chemnitz/solar
Real-time public transport API for German cities /api/v1/cities/chemnitz/station-departures
Public procurement API for German cities /api/v1/cities/chemnitz/public-tenders

How to fetch data for Chemnitz

A simple GET request, no key and no sign-up:

curl https://infranode.dev/api/v1/cities/chemnitz/weather

Or air quality:

curl https://infranode.dev/api/v1/cities/chemnitz/air-uba

All 69 data types for Chemnitz

Using the same slug, all 69 city data types can be retrieved for Chemnitz. Where a source has nothing for Chemnitz (yet), the API honestly returns no_data instead of an error. Parameters and example responses for each data type are in the linked reference:

Administrative boundary per city (BKG VG250, Tier A) /api/v1/cities/chemnitz/geo
Air quality per city (Federal Environment Agency) /api/v1/cities/chemnitz/air
Air quality per city (Federal Environment Agency) /api/v1/cities/chemnitz/air-uba
Autobahn webcams per city (Autobahn API, Tier A) /api/v1/cities/chemnitz/webcams
Bathing water quality near a city (EEA, Tier A) /api/v1/cities/chemnitz/bathing-water
Bicycle counting stations per city (municipal open data, Tier A) /api/v1/cities/chemnitz/bike-counts
Bike/scooter sharing per city, aggregated (GBFS, Tier A) /api/v1/cities/chemnitz/sharing
Building permits per city (GENESIS, Tier A) /api/v1/cities/chemnitz/construction
Business registrations/deregistrations per district (Regionalstatistik, Tier A) /api/v1/cities/chemnitz/business-registrations
Car stock and electric share per city (KBA, Tier A) /api/v1/cities/chemnitz/vehicle-registrations
City master data from Wikidata /api/v1/cities/chemnitz/base
City overview (catalog of all data types + live highlights) /api/v1/cities/chemnitz/overview
City station catalog, all DB stations (StaDa, Tier A) /api/v1/cities/chemnitz/stations
Current fuel prices per city, aggregated (Tankerkönig/MTS-K, Tier A) /api/v1/cities/chemnitz/fuel-prices
Day-ahead wholesale electricity price, nationwide (SMARD, Tier A) /api/v1/cities/chemnitz/power-price
Demographic time series per city (GENESIS/Regionalstatistik, Tier A) /api/v1/cities/chemnitz/demographics
District-heating / heat-network supply per city, federated (Tier A) /api/v1/cities/chemnitz/district-heating
Education facilities per city (OSM, Tier B) /api/v1/cities/chemnitz/education
Election result per city (Federal Returning Officer, Tier A) /api/v1/cities/chemnitz/election
Electricity consumption (grid load) per city's control zone (SMARD, Tier A) /api/v1/cities/chemnitz/power-load
Elevator/escalator status at stations per city (DB FaSta, Tier A) /api/v1/cities/chemnitz/station-facilities
Energy installations per city (MaStR, Tier A) /api/v1/cities/chemnitz/energy
EV charging-station locations per city (BNetzA, Tier A) /api/v1/cities/chemnitz/charging
Events per city (destination.one) /api/v1/cities/chemnitz/events
Filed insolvencies per district (Regionalstatistik, Tier A) /api/v1/cities/chemnitz/insolvencies
Flood warning levels per city (LHP, Tier A) /api/v1/cities/chemnitz/flood
Forest-fire and grassland-fire danger index per city (DWD, Tier A) /api/v1/cities/chemnitz/fire-danger
Government office wait times per city (live, keyless, Tier A) /api/v1/cities/chemnitz/office-wait-times
Government offices per city (OSM, Tier B) /api/v1/cities/chemnitz/government-offices
Heritage/listed monuments per city (state WFS, Tier A) /api/v1/cities/chemnitz/heritage
Hospital locations per city (Bundes-Klinik-Atlas, fail-closed) /api/v1/cities/chemnitz/hospitals-atlas
Hospital master data per city (Destatis directory, Tier A) /api/v1/cities/chemnitz/health
Inner-city roadworks and closures per city (Tier A) /api/v1/cities/chemnitz/road-events
Live arrival board for a city's main station, all categories (DB Timetables, Tier A) /api/v1/cities/chemnitz/station-arrivals
Live departure board for a city's main station, all categories (DB Timetables, Tier A) /api/v1/cities/chemnitz/station-departures
Live EV charging occupancy per city (eRound, CC0/Tier A) /api/v1/cities/chemnitz/charging-status
Live ICU bed occupancy per city (DIVI, Tier C) /api/v1/cities/chemnitz/icu-live
Local business/property tax rates per municipality (Regionalstatistik, Tier A) /api/v1/cities/chemnitz/tax-rates
Markets per city (OSM, Tier B) /api/v1/cities/chemnitz/markets
Municipal council information per city (OParl, Tier A) /api/v1/cities/chemnitz/council-papers
Official BBK NINA civil protection warnings per city (Tier A) /api/v1/cities/chemnitz/civil-protection-warnings
Official DWD weather warnings per city (Tier A) /api/v1/cities/chemnitz/weather-warnings
Official land values per city, aggregated (BORIS, Tier A) /api/v1/cities/chemnitz/land-values
Overnight stays and arrivals per city (GENESIS, Tier A) /api/v1/cities/chemnitz/tourism
Parcel lockers per city (OSM, Tier B) /api/v1/cities/chemnitz/parcel-lockers
Parking occupancy/catalogue per city (one endpoint, source fallback) /api/v1/cities/chemnitz/parking
Playgrounds per city (OSM, Tier B) /api/v1/cities/chemnitz/playgrounds
POIs per city, filtered by type (OSM/Overpass, Tier B) /api/v1/cities/chemnitz/pois
Police crime statistics per city (BKA PKS, Tier A) /api/v1/cities/chemnitz/crime-stats
Pollen and UV index per city (DWD opendata, Tier A) /api/v1/cities/chemnitz/pollen-uv
Population density per city (Census 2022 grid, Tier A) /api/v1/cities/chemnitz/population-density
Post boxes per city, with collection times (OSM, Tier B) /api/v1/cities/chemnitz/post-boxes
Post offices per city (OSM, Tier B) /api/v1/cities/chemnitz/post-offices
Public drinking water fountains per city (OSM, Tier B) /api/v1/cities/chemnitz/drinking-water
Public holidays and school vacations per city (seed, public domain) /api/v1/cities/chemnitz/holidays
Public procurement notices per city (oeffentlichevergabe.de, Tier A) /api/v1/cities/chemnitz/public-tenders
Public toilets per city (OSM, Tier B) /api/v1/cities/chemnitz/public-toilets
Public Wi-Fi locations per city (OSM, Tier B) /api/v1/cities/chemnitz/public-wifi
Public-transit stops per city (DELFI and HVV GTFS) /api/v1/cities/chemnitz/transit
Recycling centres per city (OSM, Tier B) /api/v1/cities/chemnitz/recycling-centres
Road traffic accidents per city (accident atlas, Tier A) /api/v1/cities/chemnitz/accidents
Roadworks and traffic warnings per city (Autobahn API) /api/v1/cities/chemnitz/traffic
Rooftop solar cadastre per city, federated (Tier A) /api/v1/cities/chemnitz/solar-roofs
Socioeconomic indicators per city (INKAR/BBSR, Tier A) /api/v1/cities/chemnitz/indicators
Solar irradiation + PV yield per city (PVGIS, Tier A) /api/v1/cities/chemnitz/solar
Street-tree cadastre per city (municipal WFS, Tier A) /api/v1/cities/chemnitz/tree-cadastre
Unemployment count and rate per city (GENESIS, Tier A) /api/v1/cities/chemnitz/unemployment
Water level per city (PEGELONLINE, Tier A, partial coverage) /api/v1/cities/chemnitz/water-level
Weather per city (DWD via Bright Sky) /api/v1/cities/chemnitz/weather

An overview of all cities is on the cities page. InfraNode is also available as an MCP server for AI assistants.

Chemnitz via MCP server in Claude and ChatGPT

All open data for Chemnitz is also available through the free, keyless InfraNode MCP server for AI agents. Connect it once to Claude or ChatGPT and ask in natural language, for example "Give me an overview of Chemnitz" (calls get_city_overview, the catalog of all data types with live highlights) or more specifically "What is the weather in Chemnitz?". Here is how to set it up: set up the MCP server.