Total Active Markets

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

122,371

Total Volume

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

$5,586,740,888

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.

$475,966,484

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.

$2,691,719,004

Polymarket$2.32BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.

Kalshi$350.67MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.

Limitless$18.48MOIOpen 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

0 Polymarket + 0 Kalshi, 18 overround

Cross-Platform Spreads

0 binary + 0 multi↔binary + 0 canonical

Profitable (After Fees)

none currently

Max Spread

0 overround + 0 cross-platform

No Cross-Platform Spreads Found

Scanned 0 Polymarket + 0 Kalshi binary,0 Polymarket multi-outcome × 0 Kalshi binary, plus 5 canonically-linked events. Markets are currently pricing consistently across platforms.

Overround Scanner0 markets with gap

Buy all outcomes for < $1.00

No multi-outcome markets with overround gaps found. All markets are pricing efficiently.

Cross-Platform Monitor5 events tracked

Click to expand

Event	Polymarket	Kalshi	Status	Volume
Bitcoin price in March crypto	$0	Active (3)	Waiting	$14.73M
Crude Oil (CL) to Hit $85 by End of March crypto	Active (1)	-	Live	$5.82M

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.