I haven't checked/played with their prediction game, but I'm giving OP a merit because I like these sorts of services - I used to bet in Binary Options before when they were very popular, and I really liked it. PumpFight is probably like betting on Binary Options but the risk and the gamble is set to the maximum possible setting. Hahaha.
When I visit your site, if I am not mistaken there is an app that similar with your site. That app predict where Bitcoin will moves in the next 5-10 seconds and we should place our order. But that is not a PvP games because we just predict the price go and wait for a while.
But your site is interesting because we can see the trader who place their prediction and who is the opponent. Besides that, we just need to connect our wallet and we can directly joining with them.
But before you play, you need to make sure that you can analyze the market so you will know what you need to choose. With a $5 as a minimum bet, you need to be careful spends your money and always make sure that you are in under control.
I am interesting with the Copy Trade but it still in Beta mode. But I see some traders on the lists that we can copy the trade.
The service might be fun to play, but be careful before signing any transaction being requested from this service.