I know this is an old thread but I was searching about USDT transaction and found this thread which have wrong information . So just incase someone else find it he also find correct INFO .
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Bitrrex fee for USDT is fixed for 25 USDT not 25% this have nothing to do with what type of account you have whether it is old or new basic or enchanted . Bittrex fee is crazy high when it come to USDT I would advice anyone to just buy other coin and use it to transfer such as BCC , LTC and XRP and so on .