Polymarket vs Kalshi: Complete Comparison

Side-by-side platform comparison with real-time market data, pricing, and coverage analysis.

Polymarket

Total Markets 44936

Total Volume $6.7B

Categories 6

Avg Spread 0.22¢

Kalshi

Total Markets 82758

Total Volume $2.3B

Categories 7

Avg Spread 0.09¢

Shared Markets 542

Matched Markets

Market	Poly Bid	Poly Ask	Kalshi Bid	Kalshi Ask	Spread (bps)	Volume
Will France win the 2026 FIFA World Cup?	16.0¢	16.1¢	15.0¢	17.0¢	0	$44.5M
Will Portugal win the 2026 FIFA World Cup?	10.8¢	10.9¢	11.0¢	12.0¢	0	$40.0M
Will Netherlands win the 2026 FIFA World Cup?	4.0¢	4.1¢	4.0¢	5.0¢	0	$39.1M
Will Norway win the 2026 FIFA World Cup?	2.3¢	2.4¢	—¢	2.0¢	19	$38.3M
Will Spain win the 2026 FIFA World Cup?	16.9¢	17.0¢	18.0¢	19.0¢	11	$37.9M
Will Germany win the 2026 FIFA World Cup?	5.2¢	5.3¢	—¢	6.0¢	0	$36.6M
Will Argentina win the 2026 FIFA World Cup?	8.9¢	9.0¢	8.0¢	9.0¢	0	$35.4M
Will Brazil win the 2026 FIFA World Cup?	8.6¢	8.7¢	9.0¢	10.0¢	0	$35.1M
Will England win the 2026 FIFA World Cup?	10.8¢	10.9¢	10.0¢	11.0¢	0	$32.8M
Will FC Cincinnati win the 2026 MLS Cup?	4.0¢	4.1¢	3.0¢	4.0¢	0	$1.6M
Will Vitality win IEM Cologne Major 2026?	51.0¢	52.0¢	46.0¢	48.0¢	54	$1.4M
Will San Diego FC win the 2026 MLS Cup?	3.5¢	3.6¢	3.0¢	4.0¢	0	$1.2M
Will Wyndham Clark win the 2026 RBC Canadian Open?	4.0¢	5.2¢	3.9¢	4.0¢	0	$7K
Elon Musk trillionaire before 2027?	95.7¢	96.0¢	94.0¢	95.0¢	0	$579K
Will Seattle Sounders FC win the 2026 MLS Cup?	3.6¢	3.8¢	3.0¢	7.0¢	0	$802K
Will Team Spirit win IEM Cologne Major 2026?	22.0¢	23.0¢	22.0¢	23.0¢	0	$743K
Will Natus Vincere win IEM Cologne Major 2026?	8.1¢	8.4¢	9.1¢	11.0¢	25	$615K
New Coronavirus Pandemic in 2026?	4.7¢	6.8¢	8.0¢	9.0¢	82	$15K
Will Bitcoin outperform Gold in 2026?	22.0¢	25.0¢	19.1¢	27.0¢	0	$412K
OKX IPO in 2026?	8.0¢	13.0¢	12.0¢	13.0¢	0	$559K
T20 Blast: Essex vs Kent - Most Sixes Kent Winner	5.0¢	100.0¢	—¢	100.0¢	0	$0
Will FURIA win IEM Cologne Major 2026?	4.2¢	4.5¢	3.6¢	5.0¢	0	$525K
Will Sam Burns win the 2026 RBC Canadian Open?	3.8¢	8.8¢	5.1¢	5.6¢	0	$4K
Will Collin Morikawa win the 2026 RBC Canadian Open?	2.2¢	8.0¢	3.0¢	3.1¢	0	$6K
Will Davis Thompson win the 2026 RBC Canadian Open?	2.5¢	5.0¢	2.3¢	2.7¢	0	$2
Will Kristoffer Reitan win the 2026 RBC Canadian Open?	2.6¢	3.7¢	3.1¢	3.2¢	0	$40K
Israel and Saudi Arabia normalize relations before 2027?	12.0¢	13.0¢	13.0¢	15.0¢	0	$251K
Will Vancouver Whitecaps FC win the 2026 MLS Cup?	10.7¢	11.5¢	10.0¢	13.0¢	0	$370K
Will Matt Fitzpatrick win the 2026 RBC Canadian Open?	5.1¢	10.4¢	7.8¢	8.9¢	0	$182
Will Shohei Ohtani win the 2026 NL Cy Young Award?	15.0¢	17.0¢	11.0¢	14.0¢	27	$18K

Key Differences

Regulation & Access

Polymarket is a crypto-native platform built on Polygon, accepting USDC deposits and offering global access. Kalshi is a CFTC-regulated exchange based in the United States, operating with USD and requiring identity verification for all users.

Market Coverage

Polymarket tends to focus heavily on crypto price predictions, political events, and trending cultural topics. Kalshi offers a broader range of categories including weather, economics, and financial markets, with many structured as binary contracts with specific strike prices and expiration dates.

Liquidity & Fees

Polymarket generally has tighter spreads on high-volume crypto markets due to its larger trading community, while Kalshi provides more consistent liquidity across its regulated contract offerings. Polymarket charges dynamic per-token fees while Kalshi uses a fixed fee schedule.

Arbitrage Opportunities

When the same event is priced differently across Polymarket and Kalshi, the price gap represents a potential arbitrage opportunity. PredRadar tracks these differences in real time, calculating the potential profit after platform fees in basis points.