Mark Price vs Last Price

Why the Difference Matters for Your Positions

1. Two Different Prices You Will See

On the futures trading interface you will notice two important prices:

• Last Price: The most recent traded price of the contract on the exchange.
• Mark Price: A fair-value reference price calculated by the platform to reduce the impact of short-term manipulation or abnormal spikes.

2. Why Mark Price Exists

In perpetual futures, it is possible for the last traded price to temporarily deviate significantly from the broader market (for example during thin liquidity or sudden large orders). If liquidations were based solely on Last Price, traders could be liquidated by temporary, artificial price spikes.

Mark Price is designed to be more stable and representative of the true market value. It is the primary price used for:

• Calculating Unrealized PnL
• Determining whether a position reaches the liquidation threshold
• Certain risk and margin calculations

3. Practical Implications for Traders

You may sometimes see your Unrealized PnL look different from what you expect if you only look at Last Price. This is normal.

Key points to remember:

1. Liquidation is triggered based on Mark Price (and maintenance margin requirements), not simply the last traded price.
2. A sudden spike in Last Price that quickly reverses may not liquidate you if Mark Price remains more stable.
3. Conversely, if Mark Price moves against you steadily, you can still be liquidated even if the last few trades look better.
4. Always monitor the Mark Price and the liquidation price shown on your position panel.

4. Simple Tips

• When checking your open positions, pay attention to Mark Price more than Last Price for risk assessment.
• Do not assume that a brief favorable Last Price means your position is safe.
• If the gap between Mark Price and Last Price becomes unusually large, it often indicates high volatility or low liquidity — reduce risk.
• Use lower leverage and proper position sizing so that normal Mark Price fluctuations do not threaten your account.

5. Key Takeaways

Mark Price is the more important reference for risk management on USDT-margined perpetual futures. Last Price shows recent trading activity, but Mark Price is what the system primarily uses to calculate your floating PnL and to decide liquidation. Understanding this difference helps prevent unpleasant surprises.