As you know, GHash.IO pool has been closed for a month now, and NMC and DOGE coins are no more traded on CEX.IO. Therefore, CEX.IO exchange will stop supporting wallets for these currencies in the nearest time.
Please be informed that storage fee will be applied for all DOGE and NMC wallets, as of December, 7th. This fee will be used for running the support of these wallets and will be charged in amount of 25,000 DOGE and 25 NMC per day respectively.
We recommend withdrawing your DOGE and NMC funds from CEX.IO before that date, to avoid losses.