I just used the AEON ATM in Big C on Pattaya Klang. It allows up to 20,000 Thai Baht to be withdrawn. I took out 15,000 baht. My account at Etrade bank showed $480.72 deducted. Etrade does not charge me any ATM fees except for the international ones. That was $4.80. Ignoring that for exchange comparison purposes, the exchange rate was: 15,000/480.72 = 31.20.

This is in line with the daily exchange rates I have seen around the city.

If 3 business days go by and the acct. still shows $480.72 ..only then are you in the clear.

Sometimes it takes the banks on the foreign end time to take their fees.

Otherwise on Oct. 14th that would be a great rate.

AFAIK it is not AEON bank that sets the exchange rate for your transaction. It is your own bank.

MasterCard and Visa sets the exchange rates and charge a 1% fee for their inconvenience.

MasterCards rates: https://www.mastercard.com/global/currencyconversion/

Then your bank can add a fixed fee, a percentage on the exchange rate or a combination of both.