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.

All Politics Sports Crypto Economics Culture

Markets Scanned

122

0 Polymarket + 0 Kalshi, 22 overround

Cross-Platform Spreads

0 binary + 0 multi↔binary + 0 canonical

Profitable (After Fees)

best: +3.6%

Max Spread

3.5pp

1 overround + 0 cross-platform

Top Opportunities

BEST

Best-Price Overroundeconomics

Federal Reserve Interest Rate Decision - March 2023

Buy cheapest per outcome across platforms

+81.5%

net profit

44.9pp

spread

10K%

APY (1d)

$100 → $181.49

Overroundeconomics

How many Fed rate cuts in 2026?

13 outcomes sum to 97%

+3.6%

net profit

3.5pp

spread

APY (285d)

$100 → $103.63

Cross-Platform Best-Price Overround1 found

Buy cheapest per outcome across platforms

#	Event	Outcome Breakdown	Total Cost	Gap	After Fees	APY	Volume	$100
1	Federal Reserve Interest Rate Decision - March 2023 4 outcomes\| economics	50+ bps decrease0¢

No Cross-Platform Spreads Found

Scanned 0 Polymarket + 0 Kalshi binary,0 Polymarket multi-outcome × 0 Kalshi binary, plus 3 canonically-linked events. Markets are currently pricing consistently across platforms.

Overround Scanner1 markets with gap1 profitable after fees

Buy all outcomes for < $1.00

#	Event	Top Outcomes	Sum	Gap	After Fees	APY	Volume	Trade
1	How many Fed rate cuts in 2026? 13 outcomes\| economics	0 (0 bps)35% 1 (25 bps)27% 2 (50 bps)

Cross-Platform Monitor3 events tracked

Click to expand

Event	Polymarket	Kalshi	Status	Volume
Federal Reserve Interest Rate Decision - March 2023 economics	Active (4)	-	Live	$33.86M
Federal Reserve Interest Rate Decision economics	$0	$0	Waiting	$1.06M

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.