It’s simple. We do our best to make PrimeBit exchange manipulation proof. That is why, when your position is open we calculate the profit and loss (potential, because not yet realized) using Fair Price.
In case there’s a significant difference between the Fair Price and the Order Book price (the actual price available to trade), the unrealized profit or loss may be significantly different from the actual profit or loss - the one you get after closing your position.
In our WebTrader, you can monitor your unrealized profit or loss with reference to Order Book price and Fair Price in real-time.