Pisano I'll read your thread.
I couldn't help it and coded a bit.
Here it's html version of it.
It basically consume a xml from ECB http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml
And do conversions. EUR's currency pivot.
1) http://ecommerce.natopia.com/get-exp-price?value=13.10¤cy=BRL
2) http://ecommerce.natopia.com/get-exp-price?value=6.20¤cy=USD
The object's to build a WS.
Best wishes