Yobit exchange is stopped i/o operations for EGC:
"Deposit/Withdraw will be available after upgrading the source code of the wallet. Unfortunately the developers are no hurry to send us updates - therefore, in order to avoid the losses, the network is not available.
If you have updated source code of the coin, send us https://yobit.net/en/maintenance_request/ (free) and we will fix the problem with the coin."