unfortunately, I don't have any USD in Coinbase Pro right now to send over to Coinbase to mimic your situation. all I know, is to get approximately $1200 of USDT into Bitmart (originating from my local bank account) cost me just over $8 ZERO fee to send $1200 via ACH from checking account to Coinbase PRO (but have to wait 3-5 business days to send out of Coinbase PRO) about $5.50 fee to buy $1200 worth of XLM in Coinbase PRO (from usd fiat) Zero fee to send the XLM to Bitmart approximately $2.69 to "sell" (convert XLM to USDT) in Bitmart