Don't they charge 0.001btc for the fee? I fucking hate Cex.io now. You have to withdraw almost $100 in every coin in order to be able to withdraw. I suggest new member of cryptocurrency, steer clear of Cex.io.
On a side note, its been 5 weeks to add a additional card to them.
.
They charge 0.001 btc but they bunch too many transactions together and dont use the full fee to transfer and cheat customers, so i am stuck because i paid the full transfer fee but due to grouping many transactions together my tx is now unconfirmed since a long time