Cenogram - Polish Real Estate Transactions (RCN)

Cenogram provides 8M+ Polish real estate transactions from the national price registry (Rejestr Cen Nieruchomosci / RCN) - prices recorded in notarial deeds, not asking prices from listings Nationwide coverage from 2003, refreshed roughly every two weeks. 20+ read-only tools: transaction search by location, radius or GeoJSON polygon, price statistics and distributions, location comparison, cadastral parcel resolution, and per-property context including flood and landslide hazard, heritage register, zoning, building permits and transit access Authentication is an API key or OAuth 2.1 with dynamic client registration

First seen 2 Oct 2026. Evidence as of 2 Oct 2026.