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Depends. Think there's a limit on Monzo for withdrawals now before they start charging per transaction. I have one and have used in Europe but also have Halifax Clarity credit card which was good in America but it's slower to show up on a statement. Think both tend to give you the previous day rate once transaction is 'official'.
Sorry if this is less than helpful, I'm in the pub.
Should we get one of these to preload before trips and save on int. fees?