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

• http://freeapis.blogspot.com/2010/05/yahoo-api-for-currency-exchange-rate.html
• http://www.gummy-stuff.org/Yahoo-data.htm
• 雅虎API Data本地版本

• 中文， 英语
• http://www.xe.com/symbols.php
• http://xurrency.com/currencies
• http://www1.jctrans.com/tool/sjhb.htm

• http://www.currency-converter-calculator.com/
• http://www.currencyconverterrate.com/
• 汇率