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 ??
The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??
You should look at the value of your coin in the exchange you are trading not in livecoinwatch website. A coin like exchange have different exchange for trading, the value of ethereum in every exchange are not the same. You should look first at the value of your coins before you going to sell it out.