@zeno This is also still my experience using the Mastercard currency converter.
* The MC tool does not work anymore. Does not matter if try Ars to usd or usd to ars.
1 Argentine Peso = 0.0051779 United States Dollar
Your transaction amount of 335.00 ARS = 1.73 USDin your card currency
* Using Visa website for their card does work.
335 ARS = 1.008159 USD
1 ARS = 0.003009 USD
1 USD = 332.289004 ARS