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Foreign currency conversion for international visitors to ecommerce web site?
You probably can get away with only updating the exchange rates once a day and specify that any prices quoted in units other than your home currency are estimates only. If you're planning to accept more than one currency as payment, I'd (a) see about whatever regulations there are for doing so, and (b) build in a nice spread for yourself if you're allowed to, since it is a service you're providing to your customers.  If you Google currency converter the first result is just that: a currency converter.