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What is Last, Index, and Mark Price?

  • Updated

On the Trade page, there are three different prices under Contract Details. The top one (19505.5) represents the Last Price, the left one (19511.09) is the Index Price, and the last number on the right (19510.86) is the Mark Price:

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What is Last Price?

Last Price is the last traded price on BitMEX. This is the price your contracts are bought and sold at, and it is subject to price swings disconnected from the price of the underlying index.

 

What is Index Price?

Index Price is the price of the underlying asset based on the weighted exchange average. For XBTUSD, the Index is .BXBT. For more details on BitMEX Indices, please have a look at the BitMEX Indices page.

 

What is Mark Price?

Mark Price is a derivation of the Index Price used to avoid price manipulation, calculate position margin and Unrealised PNL, and trigger liquidations. It's the Index Price times Funding Basis [Funding Basis = Funding Rate * (Time Until Funding / Funding Period)]. Please refer to the Fair Price Marking page for exact the calculation and more details on Mark Price.

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