I remember hearing something about a bitcoin credit card. Like, one that you pay for everything with fiat on credit, and then you pay off your bill in bitcoin. So you never have to hold fiat if you don't want to.
What's the best/most reliable credit card that does this?
Well, Bitcoin credit card I think its impossible to happen because the value of bitcoin is always change and it dont have definite value. Then, the bank doesnt know what bitcoin is and they didnt also accept it as deposit of their client or costumer. But I think in the near future there will be a credit system in all bank in the world also they will accept that as deposit of their client.
If the problem is because of the volatility of bitcoin. The issuer could simply just set USD as their main currency and for every transaction to make it simple and resolve all of these matters.
The only main reason of why bitcoin "credit card" hasn't been existed yet is because there's no guarantee that people who use the "credit card" will want to pay back without make some fraud requests or even just drop the bills blindly.
We're not talking about debit card but the real "credit card" ones which don't require you to load the cards but to pay the bills based on agreement and within time intervals.