How is the currency exchange rate calculated? September 22, 2022 15:21 Our currency exchange rates are based on mid-market rates by the world’s trusted currency authority XE.com. We charge no markups to the exchange rate. Related articles Is there a fee for exchanging currencies? How do I exchange currencies? Which currencies can I exchange? What are the risks of investing in a currency different from my home currency? How does tax withholding work on Mintos?