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 ??
I think you have failed the trade you have chosen the wrong time to trade, you can see that bitocin prices in your trading time are volatile and are going down, so you trade Failure is very easy to understand. I believe that this new point is appropriate for you to trade, the price of bitcoin and altcoin is rising very strongly.The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??