Crypto
Mark Price
Definition
Mark price is an exchange’s fair-value estimate used to calculate unrealized PnL and trigger liquidations, reducing the impact of short-term price spikes.
What is mark price?
Mark price is a “fair price” that a derivatives exchange uses to value open positions and manage risk, especially in perpetual futures. Instead of relying on the most recent trade, the platform computes a mark price designed to be harder to manipulate and less sensitive to brief wicks. In practice, mark price is the number used to calculate your unrealized profit and loss (PnL) and to determine whether the mark price has reached your [liquidation price](internal:glossaryEntry:WOYqfww722ZCma57EBdzTP). If you’re learning what are crypto perpetual futures, understanding mark price is essential because it explains why your chart price and your account’s risk metrics can move differently.
Mark price crypto
In mark price crypto markets, the goal is to estimate what the contract “should” be worth right now, not simply what someone last paid. Most venues start from an index price, which aggregates spot prices from multiple exchanges to represent a broader market consensus. They then adjust that reference using contract-specific inputs such as the order book mid-price (best bid/ask midpoint), a smoothing mechanism like a moving average of the contract’s basis versus spot, and sometimes the funding rate component that keeps perpetuals anchored near spot over time. The exact formula varies by exchange and contract, but the design principle is consistent: mark price should track fair value while resisting one-off prints and thin-liquidity distortions.
Mark price vs last price
Mark price vs last price is mainly a difference of purpose. Last price is the most recent traded price on that venue—useful for showing what just happened and for matching orders, but it can jump on a single aggressive trade or a momentary liquidity gap. Mark price is a risk-engine input: it’s used to compute unrealized PnL and to decide whether a position is eligible for liquidation when it crosses the liquidation price threshold. This separation helps prevent “unfair” liquidations caused by a brief wick that never reflected the broader market. In calm, liquid conditions, mark price and last price may be close; in volatile or thin conditions, they can diverge meaningfully, and that divergence is intentional.
Why mark price matters
Mark price matters because it protects both traders and exchanges from cascading liquidations driven by noise rather than true market moves. For traders, it reduces the chance that a single off-market trade forces a liquidation even though the broader market (as reflected by the index price) never traded there. For exchanges, it stabilizes margining and helps keep the perpetual futures system orderly by tying risk checks to a fair-value estimate rather than the most easily distorted print. It also clarifies a common confusion: your realized PnL depends on the price where you actually close a position, but your unrealized PnL and liquidation logic are typically based on mark price. If you’re studying what are crypto perpetual futures, mark price is one of the key mechanisms that makes leveraged perpetual trading workable at scale.
Frequently Asked Questions
How is mark price calculated in crypto?
Most exchanges derive mark price from an index price built from multiple spot markets, then apply adjustments such as order book mid-price and smoothing. Some venues also incorporate the funding rate or a basis component so the mark price reflects fair contract value rather than a single trade.
Is liquidation based on mark price or last price?
On many derivatives platforms, liquidation is triggered when the mark price reaches or crosses your liquidation price. Last price is primarily for trade execution and can be too noisy to use safely for risk checks.
What is the difference between index price and mark price?
Index price is a reference for the underlying asset’s broader spot-market value, typically aggregated across exchanges. Mark price is the exchange’s fair-value estimate for the derivative contract, often built from the index price plus contract-specific adjustments.
Can mark price be manipulated?
It’s designed to be harder to manipulate than last price because it relies on aggregated references and smoothing rather than a single print. However, extreme dislocations across multiple markets can still affect it, which is why exchanges add safeguards and filters.
Does mark price affect my realized profit and loss?
Usually no—realized PnL is determined by the price at which you actually close the position. Mark price mainly affects unrealized PnL, margin calculations, and liquidation conditions.
