This exchange Blackmoon is closed down, but up till may, it allows users to convey their BMC to USDT through they're BMC converter. The rate is at 0.0517USDT per BMC.
Blackmoon exchange had one of the lead designs in terms of interface and therefore i loved using it. Besides, it's deposit fee is zero which means it doesn't require money to deposit.
But the BMC converter that was set up for users had quite a slow working pace.
Conversions took generally 3 days. The converter is available up till 1st May, 2021. This is before the exchange finally closes down.
For now this exchange has suspended activities and the only proves running in those exchange is the BMC converter. The withdrawal fee was never constant and kept in changing depending on the price of cryptocurrencies in activity. My withdrawal limit being a certified user was 20 BTC. This is quite OK, i guess.