Short answer: Index constituent adjustment itself does not directly change your liquidation price, but it can change the calculation benchmark of the mark price. When the mark price changes, the liquidation price naturally follows. It is not that the constituent change directly moves the liquidation price. It is that the constituent change shifts the reference value used to measure whether your position is safe.
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Step 1: Understand how the liquidation price is actually calculated
What to do: Understand the relationship between the mark price and the liquidation price.
For Binance Futures, liquidation is triggered when: the mark price reaches or exceeds your liquidation price. It is not the last traded price. It is the mark price.
How to do it: Open your futures position page. It will show both the mark price and the last price. The liquidation line follows the mark price, not the last price.
Completion standard: You can find the mark price field on the position page and understand that it is different from the last price.
What makes up the mark price:
Price index: A weighted average price from a basket of major spot exchanges such as Bitstamp, Coinbase, Kraken, Binance, Huobi, KuCoin, OKX, and others.
Moving average basis: The average difference between the order book and the index over the past 30 seconds.
The mark price formula takes the median of these three values:
Price 1 = Price index × (1 + funding rate × time until next funding settlement / 8)
Price 2 = Price index + 30-second moving average basis
Contract last price
Key understanding: The anchor of the mark price is the price index. When the index changes, Price 1 and Price 2 both change, the mark price changes accordingly, and the liquidation line naturally moves.
Common mistake: Some people see that the last price has not reached the liquidation price yet, but their position gets liquidated, so they think the platform is behaving abnormally. What actually happens is that the mark price reached the liquidation line first. In extreme market conditions, the mark price and the last price can diverge significantly.
Step 2: What index constituent adjustment is and what it changes
What to do: Understand the real meaning of index constituent adjustment.
Binance's index constituent adjustment mainly targets market reference indicators such as the ALL composite index. The ALL composite index tracks all USDT-margined perpetual contracts and is rebalanced every day at 08:01 UTC.
What does this adjustment affect? It affects the composition of the price index. When a trading pair's weight changes or it is removed from the constituents, the calculation basis of the price index shifts slightly.
How does this relate to you?
The price index used in the mark price is the spot index of the underlying asset, not the ALL composite index. However, composite index constituent adjustment reflects how the platform maintains its price data sources. If a coin's spot exchange weight is adjusted because of liquidity changes, that directly affects the calculated value of that coin's price index.
Completion standard: You can explain that index constituent adjustment affects the composition of the price index, not your position parameters.
Risk warning:
If index constituent adjustment causes the price index to jump up or jump down, the mark price will change at the same time. The safe distance between your liquidation price and the current mark price may suddenly narrow. This is especially true for high-leverage positions. At the moment of index adjustment, if the mark price suddenly jumps higher for a long position or lower for a short position, you may experience a non-trading liquidation. The traded price did not move, but the mark price did.
Step 3: What actually determines your liquidation price
Index constituent adjustment is not an everyday factor. The three things that really decide your liquidation price are:
| Parameter | Effect on liquidation price | Can you control it |
|---|---|---|
| Leverage | Higher leverage moves the liquidation price closer to your entry price | ✅ Yes |
| Position size | Larger positions use more margin, so the liquidation price gets closer | ✅ Yes, by reducing position size |
| Entry price | The closer your entry price is to the current price, the less room you have against volatility | ❌ Fixed when you open the position |
How to do it: If you are worried about mark price anomalies caused by index volatility, lower your leverage and keep enough margin before opening a position. With high leverage, even a 0.5% deviation in the mark price can force you out.
Completion standard: Based on your position and leverage, you can check the current distance between the mark price and the liquidation price and understand how thick your safety cushion is.
How to verify after opening a position
After opening a position, find the mark price and liquidation price on the futures position page. The difference between the two is your safety buffer. If the mark price is close to the liquidation price, for example less than 1% away, your position is in a high-risk state. Consider adding margin or reducing leverage.
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FAQ
Q: What does the ALL composite index adjustment have to do with my individual contract?
A: Very little directly. The ALL composite index is a market reference indicator that reflects the overall performance of the USDT-margined futures market. It is not the price data source used for liquidation. Liquidation uses the spot price index of the underlying asset, which is made up of prices from a basket of spot exchanges.
Q: If the mark price is higher than the last price, which one should I look at for unrealized PnL?
A: Unrealized PnL is calculated using the mark price, not the last price. So your floating profit and loss is based on the mark price and may differ slightly from the price shown on the K-line chart.
Q: Why did my liquidation price change after the index constituent adjustment?
A: Index constituent adjustment may cause a small change in the calculation basis of the price index. For example, if a spot exchange's weight is increased, its quotes have a greater influence on the index, so the price index shifts. The mark price follows the index, and the liquidation line naturally moves as well. If the change is within 0.5%, it is normal. If it suddenly jumps more than 2%, the platform usually issues an announcement.
