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Arbitrage Scanner · 2 opportunities

Live Sports Arbitrage

Two-way markets where combined implied probability of opposing outcomes is under 100%. Stake both sides in proportion → guaranteed profit regardless of result. Cross-platform arbs (Kalshi/Polymarket vs sportsbook) are surfaced first because exchange accounts don't get limited the way sportsbook accounts do.

Opportunities
2
Avg profit
1.96%
Biggest profit
2.61%
Avg combined %
98.1%
Top 2 arbs, ranked by profit %. Stake split shown for a $1,000 total bankroll.
MarketProfitYES legNO legStake $1kLeagueStart
San Antonio
2027 Pro Basketball Champion
+2.61%Kalshi19.5% +413Other78.0% -354
YES $200
NO $800
NBA—
Kansas City
Saint Louis vs Kansas City
+1.31%Kalshi12.5% +700BetRivers86.2% -625
YES $127
NO $873
MLSJul 16, 11:00 PM

FAQ

What is sports arbitrage?
An arbitrage opportunity exists when the implied probabilities of opposing outcomes on the same market sum to less than 100%. If YES is offered at 48% on Kalshi and NO is offered at 49% on DraftKings (combined 97%), a properly sized position on both produces a guaranteed ~3% profit regardless of which side wins.
How do I execute an arb?
Size each side in proportion to the inverse of its probability so both sides pay the same amount. For a 97% combined arb on a $1,000 total bankroll: $1000 × (49% ÷ 97%) ≈ $505 buying YES on Kalshi and $1000 × (48% ÷ 97%) ≈ $495 on NO at DraftKings. Both legs return ~$1,030 — guaranteed ~$30 profit.
Are sportsbook + Kalshi arbs sustainable?
Yes. Kalshi is a regulated event-contracts exchange — they don't limit accounts for winning users the way sportsbooks do. Crossing a sportsbook against Kalshi is the safest arb path because the exchange leg is bulletproof.
How fresh is this data?
Kalshi quotes refresh every 5 minutes. Sportsbook quotes every 15-30 minutes. Polymarket every 15 minutes. Arbitrages close fast — what's visible here is what was true at page render time; verify both legs in their respective platforms before sizing positions.