Many observers look at a screen figure and assume it reflects every aspect of a Bitcoin perpetual contract. In practice, the last traded price and the mark price represent distinct references. The last traded price records the price of the most recent completed trade for an instrument on a venue, rather than the reference used for liquidation checks.
The mark price is a separate reference calculated under a venue's published contract rules, specifically used for liquidation checks. The last traded price and the mark price can differ and must not be treated as identical measurements. Confusing the latest trade execution with the liquidation reference leads to incorrect assessments of a contract.
A common misunderstanding involves chart readings for a Bitcoin perpetual contract. A chart showing last-trade candles does not by itself establish where the mark price was at the same moment. Candle data tracking completed trades cannot reveal the liquidation reference present at that exact second, as the two metrics follow distinct standards.
Proper comparison requires verifying essential details before evaluating any displayed numbers. The display label, selected contract, venue, and timestamp must all be identified before comparing two displayed prices. Overlooking these parameters leads to false comparisons between figures that describe different contracts, venues, or moments.
Account balances also highlight the difference between these references. Unrealized profit or loss can be displayed using different references, so the selected display setting matters for open positions. Meanwhile, realized profit or loss depends on actual opening and closing executions, not merely on the displayed mark reference on the venue.
Order execution further separates these two values. A mark-price value is not a promise that a market order will execute at that value. When entering or exiting a position, actual executions determine the transaction price rather than the mark calculation. The mark reference serves liquidation checks rather than functioning as a guaranteed trade price.
Price differences between these metrics do not indicate directional trends. A gap between last price and mark price alone is not a forecast of future Bitcoin price direction. The existence of a spread merely reflects that the two figures measure different things under venue rules, rather than signaling which way the market will move next.
