Spot Mark Price: median (Last Traded Price, best bid, best ask) or, if not available, the Exchange Index.
Perpetual Mark Price: the 3-second TWAP of the Last Traded Price bound to the Exchange Index +/- 0.2%. If the Market Price is not available, Exchange Index + Basis (Funding) at the last basis calculation.
The TWAP is based on the average of the open, high, low, and close of each 1-second bar.
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