Mid-Market Rate
The real exchange rate between two currencies as determined by the global market, without any markup or margin.
Full Explanation
The mid-market rate is the true, neutral exchange rate between two currencies at any given moment. It's the average of the bid and ask prices. It's called "mid-market" because it's in the middle of the market rates. When you see FX rates quoted by Google or OANDA, those are mid-market rates. However, banks and payment providers always add a margin on top of mid-market rates to profit from the transaction.