Why Does My Position Margin Decrease Without Reducing My Position?
Many perpetual contract traders may notice that their position margin fluctuates — even though they haven’t reduced their position size. This is mainly due to the funding fee mechanism and market price movements.
Funding Fee Mechanism
Perpetual contracts use funding fees to keep contract prices aligned with the spot market.
Funding is charged every 8 hours at 08:00, 16:00, and 24:00 (HKT).
You only pay or receive funding if you hold an open position at the settlement time.
If you close your position before the funding time, no fee is charged.
Formula: Funding Fee = Position Value × Funding Rate
When the funding rate is positive, longs pay shorts.
When the funding rate is negative, shorts pay longs.
The actual amount you receive depends on how much can be collected from counterparties.
Price Movements and Margin
In Cross Margin Mode, your required margin is calculated as:
Position Margin = Contract Value × Mark Price ÷ Leverage
This means your margin will automatically increase or decrease as the mark price changes.
Price fluctuations affect your position margin directly.
Funding fees may further reduce (or add to) your margin.
Important Notes
YUBIT does not charge or profit from funding fees.
Funding fees are exchanged directly between users (longs and shorts).
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