Originally Posted by
CPRich
Exchange rates change every minute of the day. It's varied been between 1.291 and 1.293 in the last four hours. There should be no expectation that every hotel in the country on every day has the same exchange rate.
However as the conversion is made by marriott for the purpose of awarding points, and not for processing payments, it is a single exchange rate per currency pair worldwide. It’s the same rate they use for their site’s currency converter which is provided by bloomberg.