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.