Index Price and Mark Price

Created by Amber Chen, Modified on Tue, 9 May, 2023 at 2:40 PM by Amber Chen

Index Price is an important reference when you are investing. It's the average market price of cryptocurrencies on major exchanges. It’s also the primary component of the mark price.


Mark Price is the price used for mark-to-market PnL calculation and platform liquidation; Mark price is designed to be fair and manipulation resistant.


Perpetual Futures Index Price

Perpetual Futures Index Price = Average Spot Liquidity Mid Price of Major Exchanges.

  • Spot Liquidity Mid Price = (Bid Price x Ask Size + Ask Price x Bid Size) / (Bid Size + Ask Size)

Reference values are provided by the following 5 exchanges: Bitfinex, Binance, Huobi and Coinbase Pro.

  • In order to ensure the stability of the index price, the average value will be calculated after removing the highest and lowest reference values.

  • The reference feeds corresponding to each currency may be different.

* When there are 5 reference values, remove the highest and lowest values, then calculate the average of the remaining 3 values.

Perpetual Futures Mark Price

Perpetual Futures Mark Price = (Spot Liquidity Mid Price x 75% + Transexchange Impact Mid Price x 25%)

  • Spot Liquidity Mid Price = (Bid Price x Ask Size + Ask Price x Bid Size) / (Bid Size + Ask Size)

  • Impact Mid Price = Average (Impact Bid Price, Impact Ask Price)

  • Impact Bid Price: The average buy price of the first 10,000 highest bid orders in the Order Book


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