Yes. ČÚZK provides RÚIAN data free through its public remote access portal, as files and as WMS and WFS services.

Does the baseray API return RÚIAN codes?

Not yet, and no completion dates either. If you need them, use the ČÚZK services.

Can I use it from ChatGPT or Claude?

Yes, through the baseray MCP server. The MCP docs have setup steps per client.

A RÚIAN API for Czech buildings and addresses.

The baseray API returns the whole building record for an area or one building over REST, with no exports to download and join.

API reference Open the live map

GET /buildings

curl "https://api.baseray.ai/v1/buildings?bbox=25.55,45.60,25.68,45.70&sort=volume&limit=25&offset=0&category=residential_house&building_type=&roof_shape=gabled&address_corroboration=corroborated&measured_height_only=false&existing_solar_panels=detected&has_solar_potential=false&has_3d_model=false&has_registered_business=false&registered_business_turnover_currency=RON&has_annual_heating_estimate=false&has_thermal_assessment=false&has_peak_heat_load=false&has_recent_climate_trend=false&has_recent_temperature_extremes=false&has_recent_precipitation=false" \
  -H "Authorization: Bearer $BASERAY_API_KEY"

{
  "data": [
    {
      "building_id": "c9eefd1b-8c8d-48fe-8b72-e015374d7720",
      "address": "5th Avenue 120",
      "locality": "Brașov",
      "country": "RO",
      "latitude": 45.64988,
      "longitude": 25.61044,
      "category": "commercial"
    }
  ]

baseray-leads.csv

address	category	footprint_m2	height_m	solar_panels	registered_office
River Road 33	Commercial	17054	18.0	None seen	Registered office
Queen Street 5	Public	11427	~10.0	Not checked
High Street 101	Commercial	11138	3.0	Not checked
Lake View 3	Commercial	9586	~9.0	Not checked
Cedar Lane 27	Industrial	9262	~14.2	Not checked

One request. The largest buildings in part of Prague, by volume.

Create an API key in the app under Settings → API keys. Each key may make 60 requests a minute; a workspace 5,000 a day.

Request

curl "https://api.baseray.ai/v1/buildings?bbox=14.40,50.07,14.45,50.09&sort=volume&limit=10" \
  -H "Authorization: Bearer $BASERAY_API_KEY"

What the API returns. A building record, not just an address point.

GET /buildings

curl "https://api.baseray.ai/v1/buildings?bbox=25.55,45.60,25.68,45.70&sort=volume&limit=25&offset=0&category=residential_house&building_type=&roof_shape=gabled&address_corroboration=corroborated&measured_height_only=false&existing_solar_panels=detected&has_solar_potential=false&has_3d_model=false&has_registered_business=false&registered_business_turnover_currency=RON&has_annual_heating_estimate=false&has_thermal_assessment=false&has_peak_heat_load=false&has_recent_climate_trend=false&has_recent_temperature_extremes=false&has_recent_precipitation=false" \
  -H "Authorization: Bearer $BASERAY_API_KEY"

{
  "data": [
    {
      "building_id": "c9eefd1b-8c8d-48fe-8b72-e015374d7720",
      "address": "5th Avenue 120",
      "locality": "Brașov",
      "country": "RO",
      "latitude": 45.64988,
      "longitude": 25.61044,
      "category": "commercial"
    }
  ]

Buildings in an area

Address, category, floors, dwellings and entrances, footprint, height and volume. Unknown values are null, never guessed.

Measured or estimated

Every height and volume says how it was obtained.

Roof and panels

Solar potential where the roof has been modelled, and a panel check with the date of the photo.

Businesses at the address

Entities registered at the building’s official address, with their IČO. Never shown as owners.

From a key to your first buildings. Three steps.

01

Create a key

In the app, under Settings → API keys.
02

Send a request

GET /v1/buildings with an area, a sort and a limit, the key in the Authorization header. Everything is in the API reference.
03

Or ask in a chat

Through the MCP server, ask about buildings in ChatGPT or Claude.

API questions. What the record holds, and what it does not yet.

Is RÚIAN free?: Yes. ČÚZK provides RÚIAN data free through its public remote access portal, as files and as WMS and WFS services.
Does the baseray API return RÚIAN codes?: Not yet, and no completion dates either. If you need them, use the ČÚZK services.
Can I use it from ChatGPT or Claude?: Yes, through the baseray MCP server. The MCP docs have setup steps per client.

Romania building data API One record per building in Romania, over REST.

A RÚIAN API for Czech buildings and addresses.

One request. The largest buildings in part of Prague, by volume.

What the API returns. A building record, not just an address point.

Buildings in an area

Measured or estimated

Roof and panels

Businesses at the address

From a key to your first buildings. Three steps.

Create a key

Send a request

Or ask in a chat

API questions. What the record holds, and what it does not yet.

Is RÚIAN free?

Does the baseray API return RÚIAN codes?

Can I use it from ChatGPT or Claude?

Related guides

Bring baseray to your territory. Tell us your regions and what you sell. We load the data and build your first segments with you.