The Historical Currency Converter is a simple way to access up to 25 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. Currency Exchange Rates. An exchange rate is the rate at which one currency may be converted into another, also called rate of exchange of foreign exchange rate or currency exchange rate. Below are government and external resources that provide currency exchange rates. Note: The exchange rates referenced on this page do not apply when making payments of U.S. taxes to the IRS. If the IRS receives U.S. tax payments in a foreign currency, the exchange rate used by the IRS to convert the foreign