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 ??
In the days before you can easily see that bitocin prices are constantly fluctuating and difficult to guess so failure of commerce is very easy to understand. But you can see that in recent days bitocin prices have been increasing and stabilizing, so this is the time for you to start trading and the success rate will be much higher.The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??