The hedge option has nothing to do with the price of an item. That function is for a vendor to use to insure they will get the same price for their BTC when the item is finalized as they did when the item was purchased since it could take up to 2 weeks before someone finalizes an order. The answer to your question is SR works on a 24hr average on BTC price. So it is always adjusting. You can pit an item into your cart and see the current rate SR is using at that time. Hope that helps