Total Active Markets

Count of all non-resolved markets currently tracked across Polymarket, Kalshi, and Limitless.

121,838

Total Volume

Lifetime trading volume across all platforms. Polymarket and Kalshi report volume directly; Limitless volume is cumulative USDC traded.

$5,565,533,998

24h Volume

24-hour trading volume. Polymarket and Kalshi report this directly. Limitless does not break out 24h volume separately, so it is not included.

$463,658,245

Total Open Interest

Polymarket: sum of pool liquidity. Kalshi: open interest (contracts outstanding). Limitless: uses total volume as a proxy — no separate OI metric is available.

$2,630,155,679

Polymarket$2.26BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.

Kalshi$350.04MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.

Limitless$18.32MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.

Arbitrage Scanner

Cross-platform spread detection across Polymarket, Kalshi & Limitless

All

Politics

Sports

Crypto

Economics

Culture

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

806

222 Polymarket + 12 Kalshi, 500 overround

Cross-Platform Spreads

107

0 binary + 0 multi↔binary + 107 canonical

Profitable (After Fees)

best: +41.1%

Max Spread

29.1pp

59 overround + 0 cross-platform

Top Opportunities

BEST

Best-Price Overroundculture

Who will be the next James Bond actor?

Buy cheapest per outcome across platforms

+153.1%

net profit

60.5pp

spread

532%

APY (105d)

$100 → $253.14

Best-Price Overroundsports

2026 MLB World Series Champion

Buy cheapest per outcome across platforms

+41.6%

net profit

29.5pp

spread

66%

APY (229d)

$100 → $141.61

Overroundother

English Premier League – 3rd Place

12 outcomes sum to 87%

+15.1%

net profit

13.1pp

spread

77%

APY (71d)

$100 → $115.07

Cross-Platform Best-Price Overround18 found

Buy cheapest per outcome across platforms

#	Event	Outcome Breakdown	Total Cost	Gap	After Fees	APY	Volume	$100
1	Who will be the next James Bond actor? 10 outcomes\| culture	James Norton0¢-4¢

Multi-Outcome Cross-Platform Arbs107 opportunities

#	Event / Outcome	Direction	Spread	Net Profit	APY	Volume	Trade
1	Zelenskyy and Putin Meet Before 2029 No meeting before 2027\|politics	YES22¢ NO24¢ Cost: 46¢ → pays $1	54.0pp

Overround Scanner59 markets with gap58 profitable after fees

Buy all outcomes for < $1.00

#	Event	Top Outcomes	Sum	Gap	After Fees	APY	Volume	Trade
1	💠 French Ligue 1 Winner 6 outcomes\| sports	PSG56% Lens11% Lyon2% +3 more

Cross-Platform Monitor72 events tracked

Click to expand

Event	Polymarket	Kalshi	Status	Volume
Acquisition of Greenland by the United States politics	Active (1)	Active (3)	Live	$30.42M
Federal Reserve Interest Rate Decision - March 2023 economics	Active (4)	-	Live	$25.73M

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.