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 believe current trade is extremely difficult, as can be seen that bitcoin prices have been fluctuating sharply and sharply over the past three months. Bitcoin market capitalization accounts for 45% of the total market capitalization so ETH is also unlikely to decrease with bitcoin. I believe you should pull out of the wall at this point to avoid loss.The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??