Features and Functionality The Historical Currency Converter is a simple way to access up to 31 years of historical exchange rates for 200+ currencies, metals, and cryptocurrencies. OANDA Rates® cover 38,000 FX currency pairs, and are easily downloadable into an Excel ready, CSV formatted file. OANDA is electronically connected to numerous global banks to access the best foreign exchange rates for its traders, and electronic algorithms on OANDA’s fxTrade servers update forex rates tick-by-tick, in periods of less than a second.