Every perpetual futures platform shows two prices. One is what the market last traded at. The other is what actually controls your liquidation — and they are not the same.
Mark price vs last price is one of the most important distinctions in perpetual futures trading — and one of the least explained. Most new traders assume the price shown on their chart is the price that matters for everything. It is not.
Perpetual futures platforms display two separate prices simultaneously:
Understanding which price controls which function — and why — directly affects how you set stops, how you read your unrealized PnL, and whether your liquidation price is what you think it is.
Last price is exactly what it sounds like: the price at which the most recent trade was executed on that specific exchange's order book.
Last price is what you see on the candlestick chart. It reflects real supply and demand on that exchange — but only that exchange. If a large market order moves the order book on one exchange, the last price spikes even if the broader market (across all exchanges) barely moved.
Last price is used for:
The problem with using last price for everything: it can be manipulated. A coordinated large order or a liquidity vacuum can spike last price briefly — long enough to trigger stop losses or liquidations — without reflecting any real change in the broader market price of the asset.
Mark price is a fair value calculation designed to be resistant to manipulation on any single exchange. It is derived from a combination of:
The exact formula varies by exchange, but the principle is consistent: mark price tracks the broader market value of the asset, not just the activity on one exchange's order book.
Mark price is used for:
Your unrealized profit and loss number is calculated using mark price — not last price. This means your PnL display can show a loss even if last price has not moved, if mark price diverges from last price.
Liquidation is triggered by mark price — not last price. This is the most important practical consequence of the mark price / last price distinction.
What this means in practice:
This is why reputable exchanges use mark price for liquidation — it protects traders from being liquidated by temporary, exchange-specific price anomalies that do not reflect real market moves.
Always check the mark price on your exchange's position panel — not just the chart price — when evaluating how close you are to liquidation. The two can diverge by 0.1% to 1%+ during volatile periods.
How liquidation is calculated → The Math of Perpetual Futures Liquidation
Before mark price became the standard, exchanges using last price for liquidation created an obvious attack vector: a large trader could place coordinated orders to briefly spike or crash the last price on a single exchange, triggering mass liquidations, then reverse the position and profit from the liquidation cascade.
This was not a theoretical concern. It happened repeatedly on early crypto derivatives platforms.
Mark price eliminates this attack vector. To move mark price, an actor would need to simultaneously move the spot price across multiple major exchanges — a far more difficult and expensive operation. Manipulation of a single exchange's order book no longer affects liquidations.
For retail traders, this means:
Here is where it gets practical: most exchanges trigger stop loss orders based on last price, not mark price. This means:
The implication for stop placement: stops set too tight are vulnerable to last price wicks — brief, sharp moves that snap back immediately. If your stop is within the typical wick range of the asset, you will be stopped out of valid trades by noise.
Using volatility-based stop placement (1.5× ATR from entry) provides a buffer that accounts for typical wick depth. A stop placed outside the noise range is less likely to be triggered by last price anomalies that do not reflect real market direction.
Some exchanges offer the option to trigger stop losses based on mark price rather than last price. If this option is available and your strategy involves tight stops, mark-price stops reduce false stop-outs from wicks.
Stop loss placement guide → How to Set a Stop Loss in Perpetual Futures
Three mark price checks before entering any perpetual futures position:
Mark price is the single source of truth for your financial position. Last price is what the chart shows. Know which one controls which — every time.
The complete risk management framework → Perpetual Futures Risk Management
How to evaluate exchange liquidation mechanics → How to Choose a Perpetual Futures Exchange
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ChartsMeanCash™ is not a registered investment advisor. All content is for informational and educational purposes only and does not constitute financial, investment, or trading advice. Trading involves substantial risk of loss. Leveraged trading amplifies both gains and losses and is not appropriate for all investors. Hypothetical backtest results referenced on this page are not a guarantee of future performance. Never trade more than you can afford to lose.