I used wirex on the past and it was one of the best cards that i have ever used until they had a lot of issues and i had to change to okpay, it is the best card, because it is very easy to use and it has very low fees.
Xapo card is a good one too, but the fees are pretty high and this made me stop using their service because it was insane just to pay more than three dollars per every transaction with your debit card, it is more than a daily salary in a third world country.
And if i am not wrong, the okpay card is below twenty dollars each one.