Weird as all my fees were Coinbase fees. No charge from Bitmart to send in the USDT from Coin Base. From my email from Coinbase "You just sent 971.292641 USDT ($971.54 USD)" that's exactly what was added to my Bitmart USDT.
Coinbase really screwed me. Sent $2,000 to Bitmart by converting it to USDT first on Coinbase. (not Pro) $73 in fees. Bitmart has a big warning that you must use the code and "a memo" when you are sending XLM. If no memo you could lose your funds it said. What kind of memo?