The USDT trading mechanism is similar to futures trading structure, but with certain differences.
The underlying price of USDT Contract is built from the indexes of multiple top exchanges. For details, please refer to Index Price. All margins, profits and losses are dominated in USDT.
Please refer to USDT Perpetual Contract Description for quote unit.
If you want to long BTC with 2 BTC, but the principal is not enough. Then, through USDT Perpetual Contract, you can buy (long) 10 lot BTCUSDT Contracts (1 lot = 0.002BTC) with 100x leverage. That is, you can hold a BTC long position valuing 2BTC by providing only the USDT with a value of 0.02 BTC.
Note: Since the USDT Perpetual Contract uses a cross-margin model, the price of digital currencies can be highly volatile. Traders should be cautious and aware and select the appropriate leverage and position for trading.