MonzaHaus Index
Market data for collector car investors.
Proprietary quarterly indices aggregating public auction results across Bring a Trailer, Cars & Bids, Classic.com, Elferspot, RM Sotheby's and AutoScout24. Open data, CC BY 4.0. Updated hourly.
Live indices
Air-Cooled 911 Index
993, 964, G-Body, 930, early 911 — the pre-1998 era.
View index →Water-Cooled 911 Index
996, 997, 991, 992 — the modern 911 family.
View index →Porsche Turbo Index
Fifty years of 911 Turbo — 930 through 992.
View index →Porsche GT Index
GT2, GT3, GT3 RS, GT4 and air-cooled RS — track-bred lineage.
View index →Coming soon
Ferrari Modern Classics Index
Modern Ferrari classics — coming soon.
About the MonzaHaus Index
Every index uses the same methodology: quarterly median hammer prices from public auction sales, grouped by generation or trim. Median over mean to reduce the effect of outlier concours sales. Sold listings only — no-sales and dealer retail asking prices are excluded.
All data is free to use under CC BY 4.0. Attribution: “MonzaHaus Index” with link to the relevant index page. Downloadable CSV available on each index.