Don't risk with these two coins. When I checked Xtrabytes in coinmarketcap, what I saw is a shady coin with incomplete data. What is most interesting to me is that it has recorded a 6,399.65% ROI. I don't know how true is this. Safex is another interesting coin that records 1,689.40% ROI but it is still a shitcoin. Do not buy it. Its volume is even very low, less than 100$. This is enough to say no to it.