# Contract Introduction

### Perpetual Contract mechanism

- What is Dual-Price mechanism?
- Index price calculation
- What is funding rate and predicted rate?
- Funding fee calculation
- Trading fee calculation
- What is Isolated Margin/ Cross Margin?

### USDT Contract

- What is USDT perpetual contract?
- Initial Margin (USDT Contract)
- Maintenance Margin (USDT Contract)
- Order Cost (USDT Contract)
- P&L calculations (USDT Contract)
- Adjust Margin on position (USDT Contract)

### Inverse Contract

- What is Inverse Contract?
- Initial Margin (Inverse Contract)
- Maintenance Margin (Inverse Contract)
- Order Cost (Inverse Contract)
- P&L calculations (Inverse)
- Liquidation process (Inverse Contract)