About CarDossier

CarDossier operates car-dossier.com, a Polish automotive data service with two products:

Vehicle history reports — consumer reports for cars registered in Poland, generated from official registries and public sources, looked up by license plate (no VIN required).
Market Data API — a developer API serving used-car market statistics (valuations, price trends, liquidity, regional prices) computed from our own database of 1.4M+ Polish market listings, updated daily. It powers our public market statistics pages and is available to third-party developers, with a keyless demo tier and a free registration tier. Learn more.

Quick facts

Website	car-dossier.com
Operated by	Joyall Inc.
Market coverage	Poland (used-car market)
Database	1.4M+ market listings, 2.4M+ price points, updated daily
Public data pages	Poland used car market (EN) · Ceny aut (PL, 330+ model pages)
Methodology	metodologia (PL)
Developer resources	API docs · OpenAPI 3.1 · llms.txt
Contact	[email protected]

Data and methodology

Our statistics are computed from CarDossier's own database of publicly listed used-car offers in Poland, collected continuously and refreshed daily. We publish asking prices (medians, not averages), trim outliers, disclose sample sizes on every statistics page, and only publish aggregate statistics — never individual listings, sellers, or vehicles. The full methodology is documented (in Polish) at /metodologia.

Name disambiguation: CarDossier (car-dossier.com) is an independent Polish-market data service operated by Joyall Inc. It is not affiliated with cardossier.ch, a Swiss vehicle-lifecycle data consortium operated by Verein cardossier. If you are looking for the Swiss project, please visit their website directly.

Products at a glance

Vehicle history report (Polish) — check a car before you buy it.
Poland used car market data — live market statistics in English.
Used car prices in Poland — median prices by make and model.
Market Data API — programmatic access for developers and AI agents.