Arbitrage betting, explained.

Bet both sides of the same game at two different books. Win either way.

Sounds fake. It's arithmetic.

Why it exists: every sportsbook bakes a fee into every price. The vig. Exchanges like Novig and the prediction markets don't, and when a no-vig price drifts far enough from a juiced one, the two prices contradict each other. Bet the contradiction and the market pays you for noticing.

The check is one line of math: turn both prices into implied win probabilities. Under 100% combined, it's an arb. Our finder runs that check on every game, every market, every book pair on the slate, and prints the stakes pre-split so both payouts match your unit.

Now the honest part, because there's always an honest part

Most arbs are 1–3%, not 11.

They vanish in minutes, and a stale line is how you end up holding one leg of a bet you never wanted. Never place leg one without confirming leg two.

And books limit accounts that only arb. They're allowed. It's their casino.

Arbitrage is finding a twenty in an old coat. Take it every time it happens. Just don't build the budget around the coat.

Related, same honesty: middle betting, explained · +EV betting, explained · the whole betting desk

Everything on this page describes mechanics, never a promise of profit. Lines move between our polls; always verify every price with the sportsbook before betting. Odds are for information only. If you or someone you know has a gambling problem, call 1-800-GAMBLER.