Dynamic Fee for Degen Mode

Aster has introduced a dynamic fee model for Degen Mode, designed to tie closing fees to your position's PnL and protect users from losses.

How It Works

The closing fee rate is calculated using three inputs: the position's profit or loss, the notional value, and a minimum floor rate.

$\text{closeFeeRate} = \max \left( \frac{\text{pnl} \cdot \text{shareRate}}{\text{notinal}}, \text{closeMinRate} \right)$

Where:

• PnL is the profit or loss on the position

• shareRate is the percentage of the notional value charged as a fee

• notional is the total value used to open the position

• closeMinRate is the minimum closing fee rate: the lowest fee that can be applied when closing a position

Parameters

• shareRate: 15% (default)

• closeMinRate: 0.03% (initial)

Example

For a position with $100 in profit, a 15% share rate, and a $600 notional:

Closing fee rate = Max(100 × 15% / 600, 0.03%) = 0.03%

In this case, the minimum closing fee rate of 0.03% applies.

Execution Fee

The execution fee is charged only when opening a position. It is set at $0.50 (BNB Chain) or $0.20 (Arbitrum), consistent with the fee charged on standard perpetuals trades.