Arbitrage Scanner

Cross-platform spread detection across Polymarket, Kalshi & Limitless

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Arbitrage Scanner

Cross-platform spread detection across Polymarket, Kalshi & Limitless

How Cross-Platform Arbitrage Works

1. Spot the Spread

When the same event has different prices on Polymarket vs Kalshi, there's a spread. E.g., "Team X wins" at 55% on Polymarket but 60% on Kalshi = 5pp spread.

2. Lock the Profit

Buy YES on the cheap platform ($0.55) and NO on the expensive platform ($0.40). Total cost: $0.95. Guaranteed payout: $1.00. Profit: $0.05 per share.

3. Mind the Risks

Kalshi charges price-dependent fees (up to 7¢/contract). Polymarket has no explicit fees but has bid/ask spread. Settlement rules may differ. Capital is locked until resolution. USDC/USD peg risk on Polymarket.

Disclaimer: This scanner identifies price discrepancies, not guaranteed profits. Always verify settlement rules match between platforms before trading. Fees, slippage, and legging risk (failing to fill both sides) can eliminate apparent profits. Markets may have different resolution criteria that make them non-equivalent. Past spreads don't predict future opportunities. This is not financial advice.

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Markets Scanned

231

0 Polymarket + 0 Kalshi, 131 overround

Cross-Platform Spreads

0 binary + 0 multi↔binary + 58 canonical

Profitable (After Fees)

best: +12.6%

Max Spread

11.2pp

4 overround + 0 cross-platform

Top Opportunities

BEST

Best-Price Overroundsports

2026 MLB World Series Champion

Buy cheapest per outcome across platforms

+44.5%

net profit

30.9pp

spread

72%

APY (225d)

$100 → $144.48

Best-Price Overroundsports

UEFA Europa League Winner

Buy cheapest per outcome across platforms

+34.8%

net profit

26.5pp

spread

198%

APY (64d)

$100 → $134.80

Overroundsports

💠 2026 NHL Stanley Cup Champion

17 outcomes sum to 89%

+12.6%

net profit

11.2pp

spread

45%

APY (103d)

$100 → $112.61

Cross-Platform Best-Price Overround9 found

Buy cheapest per outcome across platforms

#	Event	Outcome Breakdown	Total Cost	Gap	After Fees	APY	Volume	$100
1	2026 MLB World Series Champion 28 outcomes\| sports	Washington Nationals0¢-1¢

Multi-Outcome Cross-Platform Arbs58 opportunities

#	Event / Outcome	Direction	Spread	Net Profit	APY	Volume	Trade
1	NBA Coach of the Year JB Bickerstaff\|sports	YES40¢ NO41¢ Cost: 81¢ → pays $1	19.0pp	+20.1%

Overround Scanner4 markets with gap4 profitable after fees

Buy all outcomes for < $1.00

#	Event	Top Outcomes	Sum	Gap	After Fees	APY	Volume	Trade
1	💠 2026 NHL Stanley Cup Champion 17 outcomes\| sports	Colorado Avalanche19% Tampa Bay Lightning15% Carolina Hurricanes

Cross-Platform Monitor40 events tracked

Click to expand

Event	Polymarket	Kalshi	Status	Volume
Utah State Aggies vs. Villanova Wildcats NCAA Tournament Game sports	Active (1)	$0	Waiting	$19.03M
Furman Paladins vs. Connecticut Huskies NCAA Tournament Game sports	Active (1)	$0	Waiting	$11.64M

Fee Model & Methodology

Polymarket Fees (0%)

Polymarket uses an order book model with no explicit trading fees. Your real cost is the bid/ask spread, which is already reflected in the prices shown. Gas fees on Polygon are negligible (<$0.01).

Kalshi Fees (price-dependent)

Fee per contract = min(7¢, ⌈7% × price × (1−price) × 100⌉). Highest at 50/50 prices (~7¢), drops toward 0 at extreme prices. We calculate per-outcome using the actual price, not a flat rate.

APY Calculation

Annualized return = net_profit% × (365 / days_to_resolution). Simple annualization, not compound — you can't reinvest in the same arb after it resolves. Uses earliest resolution date between platforms.