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

152

0 Polymarket + 0 Kalshi, 52 overround

Cross-Platform Spreads

0 binary + 0 multi↔binary + 20 canonical

Profitable (After Fees)

best: +13.4%

Max Spread

11.9pp

12 overround + 0 cross-platform

Top Opportunities

BEST

Best-Price Overroundpolitics

2028 US Presidential Election

Buy cheapest per outcome across platforms

+19.4%

net profit

17.0pp

spread

APY (962d)

$100 → $119.39

Overroundpolitics

AZ-01 Republican Primary Winner

14 outcomes sum to 88%

+13.4%

net profit

11.9pp

spread

36%

APY (136d)

$100 → $113.44

Best-Price Overroundpolitics

Democratic Presidential Nominee 2028

Buy cheapest per outcome across platforms

+12.4%

net profit

11.1pp

spread

APY (962d)

$100 → $112.37

Cross-Platform Best-Price Overround6 found

Buy cheapest per outcome across platforms

#	Event	Outcome Breakdown	Total Cost	Gap	After Fees	APY	Volume	$100
1	2028 US Presidential Election 24 outcomes\| politics	Marco Rubio12¢-3¢

Multi-Outcome Cross-Platform Arbs20 opportunities

#	Event / Outcome	Direction	Spread	Net Profit	APY	Volume	Trade
1	Reza Pahlavi's Attempted Entry into Iran Yes\|politics	YES17¢ NO68¢ Cost: 85¢ → pays $1	15.5pp	+13.4%

Overround Scanner12 markets with gap12 profitable after fees

Buy all outcomes for < $1.00

#	Event	Top Outcomes	Sum	Gap	After Fees	APY	Volume	Trade
1	AZ-01 Republican Primary Winner 14 outcomes\| politics	Jay Feely71% Paul Reevs4% John Trobough

Cross-Platform Monitor15 events tracked

Click to expand

Event	Polymarket	Kalshi	Status	Volume
Acquisition of Greenland by the United States politics	Active (1)	Active (3)	Live	$30.67M
US government confirmation of alien existence politics	Active (1)	Active (1)	Live	$18.88M

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.