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Mark Price, Index Price, and Fair Price: Why Liquidations Don’t Trigger on the Market Price

Futures liquidations trigger on a risk reference price — not on the last trade shown on the chart.

Written byCryptoTrade Research
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Reviewed byCryptoTrade Editorial Team
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Updated

The gap between the candle price and the liquidation threshold can make a position vulnerable even when the chart “never touched” the level.

Why the Candle Price and the Futures Liquidation Price Diverge

On futures, liquidation almost never triggers on Last Price (the most recent trade). Exchanges compare collateral to maintenance margin using a risk reference price: Mark Price or Fair Price.

This guide clarifies which price is used for margin calculations and which price actually triggers forced closure: Index Price comes from spot markets, Mark Price is derived from the index plus adjustments, and on some exchanges Fair Price is effectively the same value as Mark Price.

Liquidation can look “not market-based” when the chart is drawn using Last Price, while the risk engine compares margin (the funds backing leveraged trades such as futures) to maintenance margin using Mark Price.

The gap between the candle price and the risk reference price most often appears when the order book is thin and a single trade moves the chart without confirmation from the index.

The largest divergence tends to occur with a thin order book, a widened spread (the gap between the best bid and best ask), and a series of market orders closing positions.

The chart records Last Price, while the liquidation threshold is calculated using Mark Price or Fair Price.

Divergence between market price and Mark Price, liquidation
The chart shows Last Price, while the risk engine compares margin to the threshold using Mark Price.

Understanding which price draws candles and which price drives margin calculations helps avoid stop-placement mistakes (automatic position closure at an unfavorable price) and reduces the risk of unexpected forced closure.

Three Derivatives Prices: What Index Price, Mark Price, and Fair Price Mean for Margin

A derivatives venue maintains multiple prices at once: Last Price draws candles, Index Price aggregates spot sources, and Mark Price and Fair Price define the risk reference price used for margin and liquidations.

Index Price (index price)

Index Price is the underlying asset price computed from spot quotes across multiple venues, using weights and outlier filters.

  • Source: spot quotes from multiple venues, where weights depend on depth and quote stability.
  • Use: the base reference for derivatives pricing and protection against a local skew on a single exchange.
  • Limitation: the index updates with some lag and may not immediately reflect abrupt moves.

Index Price provides the baseline for calculations, but it is not itself the liquidation threshold.

Mark Price (mark price)

Mark Price is the reference price the exchange uses to compute unrealized PnL (a position’s current profit or loss) and to check whether margin is sufficient relative to maintenance margin.

  • Source: Index Price plus adjustments that reduce the impact of single trades and short-lived spikes.
  • Use: unrealized PnL, current margin, and the moment a position enters liquidation territory.
  • Limitation: when spreads widen sharply, Mark Price can differ materially from the chart’s Last Price.

The liquidation trigger most often compares margin to the threshold using Mark Price, not Last Price.

Fair Price (fair price)

Fair Price is the name some exchanges use in the UI for the risk reference price; in typical implementations it is the same value as Mark Price.

  • Source: the same inputs used to compute Mark Price.
  • Use: margin and liquidation-threshold calculations in the risk engine.
  • Limitation: confusion arises when Fair Price is mistaken for the candle’s “market price.”

If an exchange shows Fair Price, verify whether it is used for margin and liquidations in the same way as Mark Price.

A practical Mark Price implementation on a perp venue with an oracle-based model is covered in Lighter DEX — обзор perp-биржи.

Index Price sets the baseline, Mark Price and Fair Price measure risk, and Last Price draws candles.

A single trade in a thin order book can move Last Price and create a false signal that is not confirmed by the risk reference price.

Last Price: Why the Last Trade Price Produces False Liquidation Signals

Last Price is the most recent trade price, so a single print (one trade in the order book) in sparse liquidity can shift the candle without sustained demand or supply.

The problem appears when a single trade sharply moves the chart price while the risk reference price has not changed yet.

If there are few limit orders near the market, even a small trade can “jump” through the book and print a Last Price at a level with little opposing volume.

  • Single print. One trade changes Last Price, but the next trade returns price to the prior range.
  • Series of small prints. Several rapid small trades push Last Price toward a trigger level even if order-book depth remains low.
  • Market closes. Liquidations execute with market orders and consume limit orders, so Last Price becomes a noisier source in the moment.

A stop order often triggers on Last Price. If the risk engine has already detected a threshold breach on Mark Price, the position may be forcibly closed before the candle ever reaches the stop level.

Last Price confirms that a trade occurred, but it is not the reference price used for margin risk.

The gap between Mark Price and Last Price changes trigger order: liquidation can start before the stop and without the candle “touching” the level.

Mark Price vs Last Price: Where the Mistake Comes From — and How to Verify It on the Chart

Candles are drawn using Last Price, while unrealized PnL and the maintenance margin check are computed using Mark Price. When the lines diverge, the trigger order changes.

The chart-reading mistake happens when stops and expectations are tied to Last Price, while the liquidation threshold is calculated using Mark Price.

Last Price records the last trade, while Mark Price is the reference price the exchange uses to check whether the margin buffer is sufficient relative to the liquidation threshold.

  • Last Price reacts sharply to single prints and thin book depth.
  • Mark Price is based on Index Price plus smoothing, so it doesn’t mirror every tick.
  • Liquidation price is compared against Mark Price or Fair Price, not the candle price.
  • Execution price is formed by the order book and depends on spread and available opposing volume.

Scenario: the Mark Price line crosses the liquidation threshold because Index Price has already moved, while the candle based on Last Price shows no touch due to different price sources.

Liquidation looks “weird” when Mark Price crosses the threshold while the Last Price candle doesn’t show it.

Liquidation is tied to the risk reference price, not to the last trade on the chart.

A trigger based on the risk reference price separates risk checks from random prints, so forced closures don’t become the cause of more forced closures.

Why Liquidation Isn’t Calculated on Last Price: What the Exchange Risk Engine Does

The risk engine closes a position when margin computed on Mark Price falls below maintenance margin, not when the Last Price candle visually reaches the level.

Liquidation executes as a market order and therefore influences the order-book price. If liquidation timing were determined by the last trade, each forced close could immediately worsen conditions for other positions.

Mark Price is used for exactly this reason: it is computed from an index plus smoothing and does not depend on individual trades that temporarily move the order-book price.

Reason: if the trigger were based on Last Price, forced closures would start affecting the liquidation criterion itself, because every market trade changes the last price.

When Mark Price reaches a level where collateral no longer covers maintenance margin and fees, the exchange triggers a forced close; if execution produces a deficit, losses are covered via an insurance fund or via ADL (auto-deleveraging), which reduces opposing positions.

The deficit-coverage mechanism and the role of ADL (auto-deleveraging) are explained in Auto-Deleveraging (ADL): how exchanges reduce positions when there’s a deficit .

Using Mark Price reduces situations where single trades could directly trigger forced closures.

The quality of Index Price depends on the basket of spot sources; weak outlier filters make mark pricing vulnerable to local distortions.

Index Price: How the Index Is Built — and What to Check in the Source Basket

Index Price pulls prices from multiple spot venues and averages them, so a market-maker outage or a thin book on one venue should not immediately move the index.

Index Price serves the risk engine as a base because it dampens local distortions on any single exchange.

The index typically uses liquidity-based weights and outlier filters: a source with an abnormal deviation gets less weight or is temporarily excluded.

  • Source weights. A venue with deeper spot liquidity typically influences the index more.
  • Outlier filtering. Prices that deviate materially are weighted less or temporarily removed.
  • Update frequency. More frequent updates improve responsiveness but increase noise risk.
  • Time synchronization. Quotes are aligned to the same moment so one venue’s delay doesn’t distort the index.

Example: on one exchange, the last trade price jumps due to lack of orders, but Index Price barely moves because other venues’ prices remain unchanged.

Index Price is the base for Mark Price, but the liquidation threshold is typically compared against Mark Price.

Index Price resilience depends on the source basket and the outlier-rejection rules.

The Mark Price formula adds smoothing and caps to the index, so a brief print shouldn’t instantly shift margin risk.

Mark Price and Fair Price: What Makes Up the Risk Reference Price

Different exchanges use different formulas, but the principle is the same: Mark Price starts from Index Price and adds smoothing and caps that protect margin from single prints.

Mark Price is designed so short-lived price moves do not immediately affect margin calculations.

In perpetual futures, the contract price can deviate from spot for a long time. To prevent such a skew from persisting, exchanges use a funding rate — a periodic payment between participants.

If the futures price stays above spot for a sustained period, longs pay; if it stays below, shorts pay. This makes maintaining a persistent skew costly over time.

That’s why the risk reference price can differ from the candle price, and Fair Price in an exchange UI usually means the same value as Mark Price.

📌 Funding rate and Mark Price: Risk Reference Price Inputs in Perpetual Contracts
This breakdown shows how exchanges use funding rate and Mark Price to calculate margin and liquidation thresholds.
Go to the breakdown ➜

Mark Price depends on the index plus adjustments, so it does not have to match the candle price at any given moment.

Extreme funding rate accelerates position closures via rising carry costs, while market-order flow thins the book and increases cascade risk (a chain of forced closures where one liquidation triggers the next).

Funding Rate and Mark Price: How Long/Short Imbalance Increases Liquidation Risk

Funding rate transfers money between longs and shorts; at extreme levels it raises the cost of holding the dominant side and speeds up position closures.

Funding rate makes holding a position more expensive, so some participants close before the chart price even changes direction.

When periodic funding rate payments become meaningful, positions begin to close at market, increasing pressure on price action.

What to watch when funding is high:

  • How much margin buffer exceeds the minimum required level.
  • Whether the account uses cross balance or fixed collateral per position.
  • Whether there is sufficient order-book depth near the close price.
  • How far the risk reference price differs from the chart price.
  • How costly it is to hold the position at the current rate.

Funding rate is not a direct liquidation trigger, because the risk engine compares margin to the threshold using Mark Price, not the funding rate itself.

High funding rate increases risk by speeding up position closures and adding market-order pressure to the book.

Rising Open Interest without deeper order-book liquidity signals leverage buildup; on an impulse, forced closes move price more than normal flow.

Open Interest: Why Rising Open Contracts Increase Cascade Probability

Open Interest (OI) is the number of open futures positions. When OI is high but the order book is thin, forced closures move price more.

Risk rises sharply when open positions grow beyond what the market can close smoothly.

In that situation, even a small move can force positions to close at market.

  • Rising OI with flat price often means leverage is building without a clear market direction.
  • Rising OI while order-book depth deteriorates increases slippage risk (when a position closes at a worse price than expected due to insufficient liquidity).
  • Falling OI more often coincides with leverage being flushed after a wave of closures.
  • Liquidation clusters form where many positions share similar margin buffers and similar stop settings.

OI describes leverage scale, while order-book depth describes the market’s ability to absorb market orders without large price impact.

High OI with a thin order book increases the odds of a liquidation chain even on a moderate move.

Percent moves mean little without leverage; the better reference is distance to liquidation on Mark Price.

Leverage and Liquidation Risk: Distance-to-Mark-Price Benchmarks

The higher the leverage, the smaller the Mark Price move needed to trigger liquidation.

Leverage Approx. Distance to Liquidation How to Read the Risk
2× ≈ 49.5% Low risk under normal volatility
5× ≈ 19.5% Moderate risk
10× ≈ 9.5% Meaningful risk, especially around news
20× ≈ 4.5% High risk: a small move can close the position
50× ≈ 1.5% Critical: the position is almost always “on the edge”
100× ≈ 0.5% Almost any move can cause liquidation

This table is a benchmark. Actual distance to liquidation depends on maintenance margin, fees, and the exchange’s rules. The exact level is always shown as the liquidation price based on Mark Price.

Liquidation starts when margin, computed on Mark Price, no longer covers maintenance margin and fees; market execution then turns a reference level into a real fill.

The Exchange Liquidation Engine: How the Threshold Is Calculated — and How Forced Closure Executes

The risk engine compares current margin to maintenance margin using Mark Price; after the breach, the exchange executes a forced close through the order book.

Liquidation begins when funds backing the trade are no longer sufficient to close the position at market after fees.

The liquidation threshold is a check: whether collateral is enough if the position must be closed immediately.

  1. Margin and PnL calculation.
    • Unrealized PnL is calculated on Mark Price, not on Last Price.
    • Current margin is compared to maintenance margin.
    • Fees, liquidation costs, and execution costs are included.
  2. Forced-close trigger.
    • Threshold breach is detected on Mark Price or Fair Price.
    • An execution mode is selected: full close, partial liquidation, or staged deleveraging.
    • Execution goes through the order book and depends on spread and depth.
  3. Deficit coverage if execution goes “below zero.”
    • An insurance fund covers deficits under adverse execution.
    • ADL reduces opposing positions if the deficit exceeds the fund’s capacity.
    • Partial liquidation reduces the position to restore margin above the threshold.

The liquidation threshold is calculated on Mark Price, while the actual close price is determined by the order book and slippage.

The threshold marks the moment margin becomes insufficient on Mark Price, while the realized loss depends on execution through the book.

Liquidation cascades accelerate because market orders sequentially consume limit orders; when leverage concentration is high, the move speed spikes.

Why Liquidations Accelerate Moves: A Chain of Triggers and Market Orders

Liquidations execute as market orders, so they consume limit orders and widen spreads — especially under high leverage concentration.

Each forced close adds market volume in the direction of the move, so a series of liquidations accelerates the impulse.

  1. The risk reference price reaches risk levels across multiple positions.
    • The check is done on Mark Price, not on a single trade price.
    • Positions with similar margin buffers can be closed at the same time.
  2. Positions close at market and worsen execution.
    • Market closes remove available orders from the book.
    • With weak liquidity, price shifts more than usual.
  3. The next price shift impacts the next set of positions.
    • Positions with nearby margin buffers move into risk.
    • The process stops when sufficient opposing liquidity appears.

A series of liquidations accelerates the move because market-close orders repeatedly “eat” the order book in one direction.

Liquidations don’t dampen impulses — they amplify them through market execution and slippage.

A “no candle touch” liquidation happens because risk checks and chart candles are sourced from different prices.

“No Candle Touch” Liquidation: Five Causes to Verify on an Exchange

By “candle touch,” people usually mean the moment the chart price reaches a stop or liquidation level. But exchanges compute risk using a different price, so liquidation can trigger before the candle visually reaches the level.

  • Different prices for chart vs risk. Candles are built from Last Price, while liquidation is computed on Mark Price.
  • The risk price is smoothed. Mark Price doesn’t react to every single trade as quickly as the chart price.
  • Weak liquidity. A single trade can briefly move the candle price without a broader market move.
  • Market execution. Forced closure executes against available orders and can fill worse than the reference level.
  • Position costs. Fees and margin mode reduce available collateral and pull liquidation closer.

Example: the book is thin, market closures push execution, Mark Price crosses the risk level, while the Last Price candle never visually reaches it.

Cascade drivers and the role of derivatives load are covered in Crypto market phases: accumulation, growth, and distribution .

A “no candle touch” liquidation is not a chart bug — it’s a consequence of risk being computed on a different price than the candle displays.

Maximum vulnerability appears when leverage, OI, and a thin order book coincide; in that setup, one impulse can turn into a chain of forced closures.

Pre-Entry Check: When Forced-Liquidation Risk Is at Its Highest

Risk increases when leverage and open positions build faster than the order book can absorb market orders without slippage.

Before entering a position, it makes sense to check not only the scenario, but also the margin buffer relative to the threshold on Mark Price.

Signs liquidation risk is maximal:

  • Sharp, brief price moves with weak order-book depth.
  • A large gap between bid and ask near the liquidation level.
  • Many positions with similar margin buffers that could close at the same time.
  • Very high funding rate, making positions expensive to hold.
  • Rising Open Interest without an increase in order-book liquidity.
  • A news impulse after which orders disappear from the book faster than usual.

If a stop and a liquidation level are too close, market execution can close the position at a worse price than expected.

Maximum risk appears where a thin book and high OI turn closures into a cascade of market orders.

A stop may not trigger first if it’s tied to one price while risk is computed on another.

Stop Orders and Trigger Price Source: Why Trigger Order Matters

A stop order typically reacts to the chart price, while liquidation is computed on a risk reference price.

A stop limits losses, but the risk engine has priority: if margin is insufficient, the position is forcibly closed.

When the stop is too close to the liquidation level and is tied to the candle price, the position can be closed earlier — on the risk reference price.

  • The price source that triggers the stop. Order settings may use chart price or a reference price.
  • Buffer to liquidation. There should be a gap between the stop and the risk level.
  • Close method. Market closes can produce worse execution than expected.
  • Margin mode. With cross balance, losses in other positions reduce available buffer.

A stop placed near the liquidation level may not have time to trigger if the risk reference price reaches the threshold first.

Why funding rate amplifies risk and doesn’t work on its own is explained in Funding rate: why it doesn’t work without context .

For a stop to do its job, it must be placed with the price the exchange uses to compute risk in mind.

Margin mode determines which capital participates in liquidation: only the position or the entire account balance.

Cross Margin vs Isolated Margin: How Mode Changes Liquidation

With cross margin, risk is computed on the full account balance; with isolated margin, only the position collateral is used, so liquidation timing on Mark Price differs.

  • Cross margin. The entire account balance backs liquidation; the position can survive longer, but one mistake can impact other trades.
  • Isolated margin. Risk is limited to position collateral; liquidation happens sooner, but the rest of the balance is not affected.

Choosing a margin mode doesn’t change the liquidation formula, but it determines how much capital is considered when checking the threshold on Mark Price.

Even when metrics share the same names, exchanges differ in reference-price inputs and smoothing rules, so risk-trigger timing can vary.

Exchange Differences: What to Compare in Mark Price, Index Price, and Stop Triggers

Key exchange differences come from how Index Price is built, how Mark Price is formed, and which price is used for stops and liquidations.

UI metric names may match, but the internal logic and data sources can differ.

On each contract, it’s worth checking three things: which price is used to compute unrealized PnL, which price determines the liquidation threshold, and which price triggers stop orders.

Metric What it is Where it’s used Strength Limitation
Last Price Last trade price Candles, some stop orders Reflects trades quickly Can be briefly distorted under weak liquidity
Index Price Average spot price Base for reference prices Reduces local distortion impact Responds slower than single prints
Mark Price / Fair Price Risk reference price PnL, margin, liquidations Fewer false triggers Requires understanding how it’s computed

Practical test: enable the Mark Price overlay and compare it to the candle price — the divergence often explains unexpected forced closures.

For risk control, it helps to monitor Mark Price, liquidation price, maintenance margin, and the stop-order trigger source.

Understanding the price sources and triggers on a specific contract matters more than identical UI labels.

Lower leverage and higher margin buffer reduce liquidation probability, but a thin order book and overheated derivatives demand can bring risk back within minutes.

Mark-Price Risk Management: How to Reduce Liquidation Risk on Futures

Liquidation depends on leverage, margin buffer, and order-book depth, because the threshold is set on Mark Price while execution happens through the market.

Reducing liquidation risk starts with leverage and margin-buffer settings, not with trying to guess reversals.

What reduces liquidation risk fastest:

  • Lower leverage to increase distance to the threshold on Mark Price.
  • Increase margin buffer so fees and slippage don’t “eat” remaining collateral.
  • Reduce position size on instruments with thin order books and wide spreads.
  • Separate stop level and liquidation threshold using the reference price, not candles.
  • Monitor funding rate and Open Interest in overheated moments when cascades are more likely.
  • Take partial profits if rising volatility starts worsening execution through the book.

If the stop level is close to the liquidation threshold, risk management is effectively handed to the risk engine and market execution.

How perp DEXs compute Mark Price via oracles, order books, and smoothing is covered in Pacifica on Solana: perp exchange.

Smaller size, larger margin buffer, and a correct stop-trigger source reduce liquidation odds during wicks and cascades.

Answers to common questions help explain why liquidations look different from what the chart suggests.

FAQ: Mark Price, Index Price, and Futures Liquidations

Why does the liquidation price differ from the chart’s market price?

Candles are built on Last Price, while liquidation thresholds are computed on Mark Price or Fair Price. If Mark Price crosses the threshold due to Index Price movement and smoothing, liquidation can trigger without the candle touching the level.

Can a stop-loss be set to trigger on Mark Price?

On some venues, you can choose the stop trigger source: Last Price, Mark Price, or Index Price. A stop on Mark Price reduces the risk that the risk engine sees a breach while a Last Price-based stop has not triggered yet.

What matters more for cascade risk: funding rate or open interest?

Funding rate reflects the cost of holding an imbalance, while Open Interest reflects leverage scale. Cascade probability rises when high OI coincides with a thin order book and market closures start moving price harder than normal trade flow.

Why is the actual close price worse than the liquidation reference price?

The reference price defines the trigger, but execution happens through the order book as a market order. With wide spreads and low depth, fills move worse than the trigger level due to slippage.

What actions reduce liquidation risk the most?

The fastest effect comes from lower leverage and higher margin buffer because they increase distance to the threshold on Mark Price. Further improvement comes from reducing size on thin books and using a stop trigger source that doesn’t conflict with Mark Price.

Most “weird” liquidations are explained by different price sources and market execution through the order book.

This summary ties price sources to forced-close risk: candles, margin, and execution run on different prices, and the gap is always paid for by margin.

Mark Price and Liquidations: Which Price Triggers Risk — and Which Price Draws Candles

Last Price shows the price of the most recent trade and is used to draw candles, so a single trade can briefly shift the chart price.

For risk calculations, the exchange uses a different price — Mark Price (or Fair Price), which is used to compute a position’s current result and to check whether collateral is sufficient.

If stops and expectations are tied to Last Price, while the liquidation threshold is computed on Mark Price, a position can be forcibly closed without the candle ever touching the level.

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