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What is Last, Index, and Mark Price?

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What is Last Price?

Last Price is the most recently traded price on BitMEX. This is the price at which contracts are bought and sold, and it can deviate from the underlying index price.

 

What is Index Price?

Index Price is the weighted average price of the underlying asset, based on prices from multiple exchanges. For XBTUSD, the Index is .BXBT. See the BitMEX Indices page for details.

 

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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