Yahoo API for currency exchange rate. Yahoo is providing a undocumented currency exchange rate API. Request: http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s=USDINR=X Response: in response it will return a csv file.here is the sample content of quotes.csv file. "USDINR=X",45.61,"5/7/2010","3:11pm" For more details of "f" field visit this page. http://www.gummy-stuff.org/Yahoo-data.htm