The rate changes every few minutes as they follow the market rate plus some %.
So will the rate Mastercard give you. The rate on Mastercard's site is a daily indicative rate. If the rate plunges at noon Mastercard won't give you the morning rate if you happened to check their website in the morning. Mastercard will also 'round' their rate, meaning that they'll clip you a bit on the conversion.
Yes, I'm fully aware that exchange rates change and they change much more frequently than every few minutes.
The fact of the matter is the site you posted has a much larger spread than the Mastercard rates and gives you a worse deal.
You have the option of fixing your rate up front by drawing cash out, or being exposed the currency risk by using whatever the spot rate is when you use your card, but I'll wager than the average consumer isn't in a position to decide on which way will give them a better deal so they should use the option with smaller spreads.
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