How much is fee there and what is the exchange rate used by Wirex?
tx.
Their help page displays almost no fees (excepting ATM fee and account management).
However, their exchange rate earns them some % (I cannot tell exactly, it's somewhere between 1-3%, I didn't check for quite some time). And if your local currency is not EUR nor GBP you'll have to pay some extra fees (may be to cover forex, I don't know). Unless your local currency is USD, it's not worth having USD card since it has some more fees.
The issue with Wirex has always been the exchange rates. In my opinion, they employ a very dishonest practice of not disclosing that they have a fixed fee within their exchange rate. They advertise 0% fees for Crypto-fiat conversions but that's simply not true. Their prices have a stable deviation from live prices.