Arbitrage & middles
Arbitrage bets and middles across every sportsbook
An arbitrage (arb) backs every side of a market at different sportsbooks so the payout beats your total stake, as long as every price holds and every bet is accepted. A middle takes a lower Over at one book and a higher Under at another: if the result lands in between, both bets win. The Smart Lines scans 25 US and Canadian sportsbooks for both and splits the stakes for you.
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What you get
Stakes split for your bankroll
Every arb shows what to bet on each side, scaled to the bankroll you set.
Middles with an edge
Spreads and totals where the gap between two books is worth taking: listed only when the expected value is positive, or when the pair is free.
Hedge alerts
Log the legs in your bet log and get an alert when a hedge price appears.
US and Canadian books
From DraftKings, FanDuel, BetMGM and Caesars to Ontario's regulated books and PlayNow.
New arbs and middles by email
Members can get an email within minutes when a new arb appears at their books, with both bets at books they use, or when a new middle clears their minimum EV. Filter by sport, bet type and minimum return; never the same bet twice.
Also in the subscription: +EV bets · Odds comparison · Line moves · Pick'em · Bet tracker & alerts · Leaderboard.
Questions, answered
- What is arbitrage betting?
- Backing every outcome of the same market at different sportsbooks, at prices whose implied probabilities add up to less than 100%. If every price holds and every bet is accepted, the payout beats the total staked whatever the result.
- Is arbitrage betting risk-free?
- No. Prices can move before every leg is placed, sportsbooks can cancel or limit bets, and a missed leg leaves you exposed. Check each price before you bet, place the legs quickly and read each book's rules.
- What is a middle?
- Two bets on opposite sides of a spread or total at different lines, such as Over 44.5 at one book and Under 46.5 at another. A result in between wins both; otherwise one wins and one loses, usually for a small cost.
- Which sports and sportsbooks are covered?
- NFL, NBA, NHL and MLB, plus college football and basketball, at 25 sportsbooks: 19 US brands, including DraftKings, FanDuel, BetMGM and Caesars, plus Ontario's regulated books and PlayNow in Canada.
Free calculators and guides
- Arbitrage CalculatorSplit one stake across two books to lock in the same return on either outcome.
- Hedge CalculatorSize a bet on the other side to lock in profit or cap the loss on an open position.
- Odds ConverterConvert between American, decimal and fractional odds instantly.
Read the guide: Arbitrage Betting Explained