
European cadastral parcels by reference or point: coordinates, area, land use and geometry.
ParcelGPS API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Cadastre API in JSON: cadastral reference to GPS coordinates and parcel polygon in Spain (incl. Navarre and the Basque Country) and 28 more countries. MCP included. 250 free calls a month.
Details from parcelgps.com.

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The ParcelGPS API is provided by Parcel GPS (parcelgps.com). Cadastre API in JSON: cadastral reference to GPS coordinates and parcel polygon in Spain (incl. Navarre and the Basque Country) and 28 more countries. MCP included. 250 free calls a month.
Yes. The ParcelGPS API is listed in the Geocoding category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The ParcelGPS API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The ParcelGPS API supports CORS, so front-end JavaScript can call it directly.
Yes. The ParcelGPS API is served over HTTPS, so it's safe to use in production.