• Google Finance
  応答が XML や JSON じゃない､というのがちょっと不細工ですが

http://finance.google.com/finance/converter?a=1&from=IDR&to=JPY … IDR → JPY
http://finance.google.com/finance/converter?a=1&from=JPY&to=IDR … JPY → IDR

php のﾗｯﾊﾟｰです｡
http://www.chazzuka.com/php-currency-converter-via-google-finance-104/

• Yahoo Finance は､csv でもらえる

http://download.finance.yahoo.com/d/quotes.csv?s=IDRJPY=X&f=nl1d1t1 … IDR → JPY
http://download.finance.yahoo.com/d/quotes.csv?s=JPYIDR=X&f=nl1d1t1 … JPY → IDR

"IDR to JPY",0.0083,"7/30/2012","3:17am"

• Google Calculator は､JSON でもらえる

http://www.google.com/ig/calculator?hl=en&q=1IDR=?JPY … IDR → JPY
http://www.google.com/ig/calculator?hl=en&q=1JPY=?IDR … JPY → IDR

{lhs: "1 Indonesian rupiah",rhs: "0.00833071361 Japanese yen",error: "",icc: true}

月次と年次のﾙﾋﾟｱｰ円 のﾃﾞｰﾀ取得可能です



http://ecodb.net/exchange/idr_jpy.html