It's actually a chrome extension and it adds the genes to your Axies on site. Just instal it and hover over "Stats" to reveal their genes. Also works on the marketplace but it is somewhat slow to load so you'll have to have some patience.

https://chrome.google.com/webstore/detail/freaks-axie-extension/copjnifcecdedocejpaapepagaodgpbh?hl=en