Hello I dont understand I bought for 4000 Eur one hour ago of Ethereum when it was going up, it stayed around the 10-20%, it started to decrease 5 minutes ago so I sold it and now cex.io just gave me 3500eur for it... wtf... 
The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??
If you want to play short term, coin you choose is wrong. Everyone already knows that Ethereum is a long-term coin and is not suitable when trading in a short-term way.The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??
And try trading on a large volume exchange like Bittrex Binance or Huobi.
That makes more sense and you will not be confused to choose a great coin because there are so many great coins.