Win chance
The probability that a bet wins, shown by many provably fair games next to the payout multiplier.
Win chance is the probability that a single bet wins. Provably fair games such as dice and limbo usually show it next to the payout multiplier.
How it links to the payout
In a game with no edge, win chance times payout equals 1. A 2x payout would win 50% of the time. Casinos shave the win chance slightly to build in the house edge. At a 1% edge, a 2x payout wins 49.5% of the time.
You can check this yourself: multiply the win chance by the payout. The result is the game's RTP for that bet. If it differs from what the casino advertises, ask why.