You have a good question there. Actually, I'm also confused about where they get their token prices, that's why I tried to research it and see where its coming and why it's different to other Ethereum blockchain explorers such as Etherscan and Etherchain. I've found out that most of their token prices are based on the API submitted to them by token providers and also the information conveyed to them from the token update here: https://docs.google.com/forms/d/e/1FAIpQLSemDE0-vqUnJ7ToRdt1qR95iTbaMfq0FRXt7INMMJrm1IO4dQ/viewform?c=0&w=1 Aside from that, they also follow the market cap chart which is somewhat similar to how CoinMarketcap get their prices for the different digital currencies ranked in their site.