It is not very clear regarding what is going on right now.
The question is how long this will last to prove stability at the current exchange rates? People are going insane trying to catch some of these profits, and it is easy for those selling at high prices will leave the coin and who bought them will suffer.
Time will reveal.
Yes I agree there should be a reason why this pumps,if there are no great news about a particular that's pumping we can easily tell that whales are behind it and you should be very carefully not to be left behind,when they dump it.
Bytecoin in particular has achieved 500% increase today, but nothing new with its platform and that leads to the conclusion it is just the big holders of these coins decided to get as much liquidity from it and leave it behind. Unless of course, there is something proven with its platform to be doing something that users are adopting. It just makes no sense for this pump.
At its difficulty rate, anyone could easily mine 1000 - 2000 bytecoins a day, keeping these rates on high will make anybody make some cash money on daily basis if it keeps increasing.
So logically, it is not as good as it seems to be.