What Is Mark Price?
Mark price is a fair price estimate used by derivatives exchanges to calculate unrealized P&L and trigger liquidations. Instead of using the last traded price (which can be manipulated by a single large trade), mark price typically combines the spot index price with a moving average of the funding basis to create a more stable, manipulation-resistant reference.
How Mark Price Works
The formula varies by exchange but generally: Mark Price = Spot Index Price + Exponential Moving Average of (Futures Price - Spot Index Price). This prevents "scam wicks" — brief, extreme price deviations on the derivatives market — from causing mass liquidations. Your unrealized P&L fluctuates with the mark price, but liquidation only triggers when the mark price hits your liquidation level.
Why It Matters for Traders
Understanding mark price is essential for managing leveraged positions. A large deviation between the last traded price and the mark price suggests the futures market is dislocated from the index — either a temporary inefficiency or a manipulation attempt. Always check whether your exchange uses mark price or last price for liquidation calculations, as this directly affects your effective liquidation level.
How It Works on CEX Perps
On centralized perpetual futures venues, mark price shows up in the position panel, the funding timer, or the liquidation engine rather than as a separate product. Traders usually check it next to mark price, margin mode, and open interest so they do not size a trade from last price alone.
Example numbers only (not a live quote): if you hold a $10,000 notional long with 5x leverage, your initial margin is about $2,000. A move against you of roughly 20% of that notional can push the position near maintenance margin depending on the venue formula. Always read the venue's own liquidation rule before you size.
Formula and Worked Example
Use this only as a labeled example. It is not a live market print.
- Notional = coin size × mark price.
- Initial margin ≈ notional ÷ leverage.
- Distance to liquidation depends on maintenance margin, fees, and whether you use cross or isolated margin.
Example: 0.1 BTC long, mark $60,000, leverage 10x → notional $6,000, initial margin about $600. If maintenance margin is near 0.5% of notional, a modest adverse move can close the trade even when your thesis is still intact.
Common Mistakes
- Treating a single print of mark price as a trade signal without checking funding, open interest, and your liquidation price.
- Mixing venue conventions (coin-margined vs USDT-margined, cross vs isolated) and reading the wrong mark.
- Copying example numbers from a glossary into live size without checking the current book depth and fee schedule.
- Ignoring related terms that change the meaning of the print on a given day.
