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DERIVATIVES · MARK PRICE

Mark Price vs Last Price: Why Liquidation Can Surprise You

Your chart shows the last traded price. Your liquidation is decided by the mark price. They can differ, especially in fast markets.

By ChartsPod Editorial Team · Reviewed by ChartsPod Research
Published · Updated · 5 min read

Short answer

Exchanges use a mark price, derived from an index of spot prices and a premium component, to calculate unrealised P&L and trigger liquidations, rather than the last traded price, which can spike on thin trading. Bybit documents that liquidation triggers on mark price and depends on margin mode; Binance's premiumIndex endpoint reports mark and index prices. Liquidation can surprise you when your chart's last price never reached your liquidation level but the mark did, or the reverse. Keep a margin buffer and watch the mark price, not just the candle.

Last vs mark vs index

PriceSourceUsed for
Last priceLatest trade on that contractCharts, fills
Index priceWeighted spot prices across venuesMark price input, funding
Mark priceIndex plus premium componentUnrealised P&L, liquidation
Why they divergeWhy they diverge. Left, Last price spikes: Thin book wicks; Large market orders; Not used for liquidation; Visible on chart. Right, Mark price moves: Spot index moves; Premium changes; Triggers liquidation; Often not on chart.LAST PRICE SPIKESThin book wicksLarge market ordersNot used for liquidationVisible on chartMARK PRICE MOVESSpot index movesPremium changesTriggers liquidationOften not on chart
Watch the one that controls your risk. Original ChartsPod editorial graphic.

Two surprises

Liquidated without the chart reaching your level: spot moved on other venues, the index and mark followed, and the mark crossed your liquidation level while the perp's last price lagged.

Survived a wick past your level: a brief spike on the perp's last price did not move the mark enough.

Liquidation via mark price (illustrative)Liquidation via mark price (illustrative): 14:00: Last 60,000; mark 60,010; 14:02: Spot drops on other venues; 14:03: Mark 58,950 crosses liq 59,000; 14:03: Last still 59,200: position liquidated.14:00Last 60,000; mark 60,01014:02Spot drops on other venues14:03Mark 58,950 crosses liq 59,00014:03Last still 59,200: positionliquidated
The chart's low never reached the liquidation price. Original ChartsPod editorial graphic.

Protecting yourself

Mark-price risk checksMark-price risk checks: Know your liquidation price and margin mode; Add mark price to your chart if available; Keep a buffer beyond normal index–last spread; Use stops based on mark or with margin; Reduce leverage in fast markets.MARK-PRICE RISK CHECKSKnow your liquidation price and margin modeAdd mark price to your chart if availableKeep a buffer beyond normal index–last spreadUse stops based on mark or with marginReduce leverage in fast markets
Your liquidation follows the mark. Original ChartsPod editorial graphic.

See Stop-Loss Trigger vs Fill Price: Plan for Slippage in Fast Markets for stop trigger vs fill and Leverage vs Risk per Trade: Why a Small Margin Can Still Lose More for leverage vs risk.

Example: margin buffer sizing

Illustrative: on a perpetual, the gap between last price and mark price is usually under 0.1%, but during fast moves it has reached 0.6%. A trader whose stop is 1% from entry and whose liquidation is 1.3% away has only 0.3% of buffer between stop and liquidation. In a fast move, the mark can reach liquidation before the stop executes at the last price.

Increasing margin so liquidation sits 3% away, or reducing leverage, restores a buffer larger than the worst observed gap. The stop then has room to work.

Conclusion

Track the mark price and keep a margin buffer; the last-price chart does not decide your liquidation.

Check mark-related context and liquidations alongside the chart.

Open the ChartsPod terminal

Review Mark Price vs Last Price with bar replay before using it live.

Open ChartsPod replay

Questions readers ask

What is mark price?

An exchange-calculated price from an index plus premium, used for P&L and liquidation.

Why was I liquidated when price didn't reach my level?

The mark price crossed your liquidation level even if the last price didn't.

Does a wick on the chart liquidate me?

Only if the mark price also crosses your level.

Sources and methodology

Derivatives definitions come from Binance's USD-M market data documentation, Hyperliquid's funding documentation, Bybit's liquidation rules and Deribit Insights, as read on 17 October 2026. ChartsPod features were checked on its public pages. Examples use illustrative numbers.

  1. Bybit: Liquidation process — mark price and margin modes.
  2. Binance: USD-M market data (long/short ratios, OI statistics, klines) — ratio definitions, 30-day retention, kline open/close time.
  3. Hyperliquid docs: Funding — hourly payments, 1/8 of the 8-hour rate, oracle price for notional.

This article explains research tools and workflows. It is not financial advice, does not recommend buying or selling any asset and does not predict prices. Crypto derivatives carry a risk of rapid and total loss of margin.

CHARTSPOD EDITORIAL EDITION · RESEARCH AND EDUCATION ONLY · NOT FINANCIAL ADVICE.