How to retrieve exchange rate info from Yahoo! Finance API

Format:
http://quote.yahoo.com/d/quotes.csv?s={from-currency}{to-currency}=X&f=sl1&e=.csv

Example:
http://quote.yahoo.com/d/quotes.csv?s=USDAUD=X&f=sl1&e=.csv

Specify multiple currency pairs:
http://quote.yahoo.com/d/quotes.csv?s=AUDTWD=X+USDAUD=X+HKDTWD=X&f=sl1&e=.csv

For more info about the “f” field:
http://www.gummy-stuff.org/Yahoo-data.htm