A single bet on Supabets refers to the type of bet. A single bet is basically an individual bet. If it wins you'll get the payout. If it loses, you won't. This is compared to a multi bet or system bet where the results of several bets are taken together. In a multibet, for instance, if one bet out of five bets loses, the entire bet is lost. Single bets may not be glamorous, but they are safe.