Yes, there is. It's called arbitrage betting.
Essentially you are simply taking advantage of different competitive prices that different bookies may offer at the same time. You bet x% of your balance on one outcome and x% of your balance on another - if you win either of these outcomes then you are guaranteed to win a fixed percentage of profit. It's basically +EV gambling. But right now these odds are quite hard to find.
it works only on sportsbetting isn't it?
you will have no chance to lose with this arbitrage betting , as you bet on both sides ,
more than just a safe method actually , you just need to have a wide network ,
you need more than 1 sportsbetting account, it is not big deal i can say yes this is the safe methodin sportsbetting.