I know bet365 only supports fiat but it's my first time to hear BetOnline so I did a search and it looks like they also accept fiat but the place your in right now is bitcoin/crypto forum, are you sure that what you are looking for this time is a crypto based gambling site? But, I think there are already a few crypto gambling sites that accepts both fiat and crypto, maybe that is the one that will be better for you. You can try stake.com. not only that site have a casino games but they have adopted sports betting too. I am not really sure though if stake is considered to be the best when it comes to sportsbook only by this year but they have this title before.