MasterCard authorisations do indeed use a live bid rate which is frequently updated throughout the day. :slight_smile:

Settlements are processed together in batches. There are several clearing cycle batches each week day. A transaction normally settles a few days after the original authorisation, during which time the exchange rate can change. This is why Monzo shows the exchange rate as pending. :hourglass_flowing_sand:

Each clearing cycle uses a single exchange rate determined by MasterCard. This means that although your two ATM transactions are showing different rates after they have been authorised, it is likely they will be have the same exchange rate after settlement because they will be processed in the same clearing cycle.

Multiple clearing cycles per day also means that sometimes the exchange rate you see for a settled transaction varies slightly from the official MasterCard daily exchange rate webpage. (Because the webpage displays an average across of all of the clearing cycles).

Rozliczane po kursie organizacji do PLN:
Mastercard Citi Ultime
Karta debetowa i kredytowa VISA Noble Banku (tu przy karcie debetowej wypłaty za granicą są bez prowizji dla Banku)
Karta debetowa i kredytowa VIsa Getin
Karta debetowa i kredytowa Visa Banku Pocztowego
Karty debetowe PEKAO S.A. - zarówno VISA jak i Mastrercard (tu w zależności od wariantu konto można mieć wypłaty za granicą są bez prowizji dla Banku)
Karta kredytowa Mastercard BGŻ BNP Mam Bonus - ta wydawana w punktach dawnego Sygma Banku, ta co w oddziałach banku ma inne przeliczenie.
Poza tym:
Karty walutowe kantoru i T-mobile Usługi Bankowe - do tego jest oddzielny wątek
Revolut