# User Tutorial

## **How it Works**

Shield Mode differs from Aster Perpr, offering an easier, faster, and more streamlined trading experience. Users can trade more quickly and find it simpler to operate and start trading. Some guidelines:

**Long:** Indicating an uptrend. If users expect the price to increase, they can select LONG as the direction. Users will then gain profit when the price rises.

**Short:** Indicating a downtrend. If users expect the price to decrease, they can select SHORT as the direction. Users will then gain profit when the price drops.

**Leverage:** The minimum leverage supported in Perp Shield is 20x, while the highest leverage is 1001x. The higher the chosen leverage, the greater the risk.

**Funding Rate:** The Funding Rate is calculated hourly. It may be adjusted based on market performance.

**Note**:

* The higher the leverage of the positions, the greater the risk. Users will be charged a funding fee if they hold a position for more than 1 hour. The funding rate and funding fee, which users pay to (or receive from) traders on the opposite side of the trade, depend on market conditions.
* To maintain market stability, if a user's profit from a single position trading pair exceeds the threshold, the system will automatically close the position for the user. After settling without any issues, the system will release the profit funds to the user.

#### **Automatic close threshold:**

* BTC symbol≥ 50,000 USDT
* ETH symbol≥ 50,000 USDT
* RWA symbol≥ 3000 USDT
* Stocks symbol≥ 3000 USDT

### **Calculation of Profit and Loss (PNL), Return on Equity (ROE), and Liquidation Price**

**PNL** = Size of position × (Mark Price - Entry Price) × Direction

**Size of position** = Initial Margin × Leverage / Entry Price

If the position direction is LONG, the calculation of position direction will be 1, whereas if the position direction is SHORT, the calculation of position direction will be -1.

**ROE%** = PNL / Initial Margin

#### **Example**

**Unrealized PNL** =  (5\*200/26,266) \*(26,250 - 26,266) = - 0.6091 USDT

**ROE%** = - 0.6091/5 = -12.18%

**Forced Liquidation Price** = (Position Size \* Open Price - Accumulated Funding Rate - Initial Margin \* Liquidation. Lost Rate) / Position Size \* Position Direction