Oanda and Yahoo Finance are two services that offer historical currency charts, as noted by the official website of each organization. Upon visiting each website, a user is prompted to select the associated currencies and time periods to view the historical exchange rates.
Oanda is unique in that it allows a user to compare one currency against multiple currencies at a given time. For instance, the website prompts a user to enter the currency he has, and then there are five additional fields to select the currency output. Other fields on the Oanda currency conversion page are date range, price option, rate and frequency. The output is an interactive graph that charts the output currency on the vertical axis and the time period on the horizontal axis.
Yahoo Finance has a similar structure; however, the main page consists of the major and most frequent currency converts. As of March 2015, some of the more common currency pairings are EUR/USD, AUD/USD, GBP/USD and USD/JPY. Certain financial metrics are also available related to the most recent currency data. Price change, percentage change, day range and 52 week range are the basic financial metrics available. Given that currency rates change on a daily basis, the metrics are updated in real-time. In addition, a detailed chart is available that allows a user to specify a currency and a relevant period to analyze the exchange rate.