Since the launch of Cryptokitties.co, KittyExplorer.com has provided trade information on kitties. KittyExplorer.com was therefore one of the first websites to do so.
At a high level, kitties are traded at a higher price when they are of a low generation (implying a higher fertility) and / or are good looking, and / or have rare characteristics also called rare cattributes and /or are earmarked as fancy or even exclusive.
KittyExplorer enables you to differentiate between these factors, plus it gives you an overview of the general market trend. Enjoy!