What is Arbitrage?
Betting both sides of the same market at different sportsbooks where the prices guarantee a small profit regardless of outcome.
Also known as: arb
Arbitrage exploits price differences between sportsbooks. When book A's price on side X and book B's price on side Y add to less than 100% implied probability, the math says you can bet both and bank the difference. Real-world frictions — limits, line moves, account closures — mean arbitrage is more a side hustle than a strategy at scale, but it is mathematically pure when the prices line up.
Related terms
Placing a second bet on the opposite outcome of a live ticket to lock in profit or reduce risk.
The probability of a result that a sportsbook's odds are pricing in — calculated as one divided by the decimal odds.
Comparing prices at multiple sportsbooks to bet the best available number on every play.
See arbitrage applied to a real slate
NotaSportsGuru runs the math behind every published leg — Parlay of the Day, player props, match lines — with the model’s expected value and edge on every line.