We stream the prices from the exchanges we’ve partnered with and calculate a Volume Weighted Average Price (VWAP). Our derived rate takes into account other factors, such as market depth and volatility. We then apply a margin on our derived rate, which you are shown separately before you execute a transation, and afterwards in the transaction details—this is dependant on what plan you are on. (See our Fees and Charges Section for details.) The price you pay is locked in at the time of the exchange settlement.