Answer
Yes, it was stated that a Prex card can be topped up directly from Russian banks without a fee and at a favorable exchange rate. It was also noted that funds can be transferred from PayPal to a Prex card for further use.
For users, this makes Prex a convenient interim tool: the card can help with everyday payments when a full local bank account has not yet been opened or is not used for all transactions in Uruguay.
However, the way the card is topped up does not eliminate financial risks. Limits, the exchange rate, possible restrictions related to the source of funds, and how incoming funds will appear in subsequent banking transactions should all be considered. It is best not to mix large sums with everyday expenses without clear documentation.