>Don't know where this website is getting its exchange rates from.
>Money market exchange rates vary by the minute twentyfour hours a day. On the other hand most banks set their 'tourist-rates' just once a day (and these vary between banks). IAC, the only 'real' exchange rate is what you get when you do the deal.

Yes, I know about the real exchange rate is when we process the payment. But, I need to have this as close as possible to the actual rate when the payment will be done. So, if I have it ok at every 5 minutes, for exemple, this will be good enough for me. It was just surprising for me to learn that this is changing overnight as well when the markets are closed between those two countries. I was trying to understand what could affect that.

But, the most important issue is why this value returned by the Web Service was different from two different routes. I mean, the value were not close at all. The Web server located in Montreal returned something like 1.1502 to 1.1515 for about an hour. But, my PC in New Brunswick, was returning always something like 1.1530 to 1.1534 during the same period.