Contract Specifications
| Instrument / symbol | USDT-PERP | 
| Contract unit | USDT | 
| Underlying asset | BIT index price | 
| Settlement | The realized profits and losses generated from user trading of contracts or options will be immediately transferred to the account balance. 
 Unrealized profits and losses will not be settled daily; users need to close positions to realize and settle profits and losses. | 
| Delivery | No delivery | 
| Mark price | BIT Index + 30 seconds EMA* of (Average of Fair Bid & Ask - BIT Index) 
 Read here for more details | 
| Trading band | +/- 3% from BIT Mark Price | 
| Leverage | 1-100x leverage (cross margin), which will be decided by position | 
| Max position | The maximum position for a single instrument cannot exceed 2,000,000 USDT | 
| Funding | Funding is calculated and charged every 10 seconds 
 | 
| Fees | Maker: 0.03% Taker: 0.06% Check VIP fee rates here 
 Forced liquidation fee: 0.5% | 
| Block trade | Supported | 
Trading rules
BIT sets trading rules for USDT margined perpetual in terms of order size, price & step, position limits, and etc. Please see BTCUSDT PERP and ETHUSDT PERP rules below as an example.
| Instrument | Min Size | Size Step | Min Price | Price Step | Max position | Max Open Orders | Upper/Lower Bound | Order Price Cap | 
| BTCUSD PERP | 0.02 BTC | 0.001 BTC | 0.1 USDT | 0.1 USDT | 2,000,000 USDT | 100 | 0.50% / 0.50% | 1.50% | 
| ETHUSD PERP | 0.01 ETH | 0.01 ETH | 0.01 USDT | 0.1 USDT | 2,000,000 USDT | 100 | 0.50% / 0.50% | 1.50% | 
For more trading rules, please visit trading center.