To facilitate better user experience, BaseFEX has just removed the minimum deposit requirements, which was 20 USDT for USDT-settled contracts and 0.002 BTC for BTC-settled contracts.
The change has already be in effect at the time of writing. Now you can deposit as little as you wish, as long as that covers the network fee.
If you have any questions, please do not hesitate to get in touch with us via live chat or email: https://www.basefex.com/docs/support
Jan 22, 2020