Obsidian Black Card like most crypto compatible card can be used for crypto transaction and fiat currency it support both currency with a very good with and overall fee of 0.39% support instant top up with monthly limit of $1000.
Interestinly cost of incurring the card is free with zero monthly fee with a 2% cashback on purchase.
To use this card a user most first follow some certain rules assign by the platform which is holding 50,000 MCO for a period of six months.
Overall I would say Obsidian Black Card is quite an amazing card that users can use to perform all their online transaction and also support offline transaction using ATM and physical commercial center for making purchase with cashback.