info about how the mark price is calculated? Thanks
Mark price is the perpetual contract price, it's the price of the last trade.
Some times it changes without any trade. Why is that?
The chart/trade history can sometimes be delayed so the mark price shown when entering the position will always be your real entry. There's also a possibility that someone can make a trade between when you confirm the trade and when it settles on-chain (Optimism has near-instant finality so this is quite uncommon).
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