There is such a service: historiapojazdu.gov.pl/strona-glowna
In greece it is very common for the car dealers to decrease the imported car's real KMs thats why i am asking.
In Poland it is also very common. Driving from Berlin towards PoznaĆ (and Warsaw), shortly after crossing the border, you can even see bilboards advertising such services... And the majority of cars in Poland came from Germany as second-hand.
Before buying a car imported from Poland, examine it really in detail.
Take the car to a local garage or dealer and pay for someone to check the chassis over.
But not to a garage recommended by the person who is selling that car.
Have the paint on the car checked to verify if the car didn't have any accident (so that it had to be repainted).