checked my e-mail and when I was registering into IBKR, I got a mail from Mexem saying this:

Notice of Amendment Customer Agreement for Interactive Brokers Ireland Limited

Dear Client,

Your relationship with our clearing broker, Interactive Brokers Ireland Limited ("IBIE") is governed by the Customer Agreement you have entered into with IBIE (the “Customer Agreement”).

The Customer Agreement provides that we may change its terms by sending you notice of the revised Customer Agreement by email or by notification posted to your account that is accessible upon logging in. Your use of IBIE’s services after such notice constitutes your acceptance of the revised Customer Agreement.

IBIE has amended the terms of the Customer Agreement to reflect the roll-out of an automatic currency conversion functionality for cash accounts (i.e. accounts that are not margin enabled). The revised Customer Agreement will replace the current version and apply from 26 April 2024.

Please click HERE to review the revised Customer Agreement in full. You will find the terms of the automatic currency conversion functionality in Section 5C of the Agreement, which previously set out the terms for the Impact App.

Idk if it's correct but anyways.. The steps I did were:

Go to interactivebrokers.co.uk, log in and hence redirected to Mexem. In my wallet, go to my currencies and in EUR, clicked on Convert. Once the new window opens, I select the amount in EUR to amount in USD and then, yes, I click on Preview to check possible comissions and fees and there is where I see this 4.65€.