Tether (USDT) deposits are possible using two transport protocols:
1) OMNI (Bitcoin/OmniLayer)
2) ETH (Ethereum/ERC20)
BitHash will add support for ERC20-based (Ethereum) Tether USDT addresses from 2019/09/01 00:00 (SGT). Tether USDT deposits and withdrawals are now available for both OMNI-based and ERC20-based tokens.