# Exchange Rates
Historical exchange rates data is essential for being able to interpret historical financial data published in different currencies.
There are a number of publicly available sources for exchange rates data. You can retrieve a full extract of exchange rates data from the OECD and the Federal Reserve from a single dataset which is automatically generated each night. The below badge shows the current status of this nightly update process:
|Date||The date of the exchange rate (equivalent to |
|Rate||The rate of this currency to USD|
|Currency||The currency code for this currency (according to |
|Frequency||Whether this currency is a daily date (|
|Source||The source of this data, currently OECD (|
# Selecting the best date
Because multiple sources are used, you may wish to use a formula to prefer certain sources over others. For example, you may significantly prefer the daily rates from FRED to the monthly rates from the OECD, but still have the OECD rates as a fallback option if there's nothing else available (e.g. for very old rates).