Polymarket and Kalshi are the two dominant players in the prediction market space. While both let you trade on real-world events, they take fundamentally different approaches. Polymarket embraces crypto and decentralization, while Kalshi operates as a CFTC-regulated exchange.

In this comprehensive comparison, we'll help you understand which platform is better suited for your trading style and situation.

Quick Verdict

Choose Polymarket If:

- You want more market variety
- You prefer lower fees
- You're comfortable with crypto
- You want deeper liquidity
- You're outside the US

Choose Kalshi If:

- You need full regulatory compliance
- You prefer traditional finance
- You want tax simplicity (1099s)
- You're a US resident prioritizing legality

Side-by-Side Comparison

Feature	Polymarket	Kalshi
Founded	2020	2018
Regulation	Decentralized (No CFTC)	CFTC Regulated
Currency	USDC (Crypto)	USD (Bank/Card)
Trading Fee	2% on profit	1-7% per contract
Active Markets	1,000+	200+
Daily Volume	$20M+	$5M+
US Access	Restricted	Full Access
Mobile App	Web Only	iOS & Android
API Access	Yes (Free)	Yes (Limited)

Fees Comparison

Fees are one of the biggest differences between the two platforms. Let's break down what you actually pay:

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Polymarket Fees

2% on winning profits only
0% on losing positions
0% maker fees
~$0.01 gas per trade
0% sports market fees (promo)

Kalshi Fees

-1-7% per contract (varies)
-Fees charged on every trade
-Additional fees for some markets
$0 deposit/withdrawal
Volume discounts available

Fee Example: $100 Trade

Polymarket:

Buy YES at $0.40, win $1.00

Profit: $60, Fee: $1.20 (2%)

Net: $58.80

Kalshi:

Buy YES at $0.40, win $1.00

Fee on entry: ~$3, Fee on exit: ~$3

Net: ~$54

Market Selection

Polymarket offers significantly more markets across a wider range of topics. Kalshi's market selection is more limited due to regulatory requirements.

Polymarket Markets

Politics & Elections
Crypto (Rolling prices)
Sports (NBA, NFL, NHL, Soccer)
Weather & Climate
Pop Culture & Entertainment
Science & Technology
Business & Finance
Geopolitics
1,000+ active markets

Kalshi Markets

Economics (Fed rates, CPI)
Politics & Elections
Weather
Finance (Stock movements)
Crypto prices
Some entertainment events
Sports (not allowed by CFTC)
200+ active markets

Regulation & Legal Status

This is the most significant difference between the platforms and the main reason many traders choose one over the other.

Polymarket - Decentralized

Built on blockchain (Polygon)
Available globally (where crypto is legal)
US users restricted (settled with CFTC in 2022)
Self-custody of funds
No tax reporting (you're responsible)

Kalshi - CFTC Regulated

Fully legal for US residents
CFTC-regulated Designated Contract Market (DCM)
Provides 1099 tax forms
Limited to US residents only
Market types restricted by CFTC

Liquidity & Trading Experience

Liquidity matters because it affects how easily you can enter and exit positions at good prices.

Liquidity Comparison

Polymarket~$20M daily volume

Kalshi~$5M daily volume

Higher liquidity = tighter spreads, easier to trade large positions

User Experience & Access

Polymarket UX

Clean, modern web interface
No mobile app (web only)
Full API access for bots
-Requires crypto knowledge
Active Discord community

Kalshi UX

Professional trading interface
iOS and Android apps
-Limited API access
Traditional finance familiar
Bank/card deposits

Pros and Cons Summary

Polymarket

Pros

+ More markets & categories
+ Lower fees (2% on profit)
+ Higher liquidity
+ Full API access
+ Global access
+ Sports markets

Cons

- US residents restricted
- Requires crypto knowledge
- No mobile app
- No tax forms
- Regulatory uncertainty

Kalshi

Pros

+ Fully legal in US
+ Tax forms (1099)
+ Mobile apps
+ Bank deposits
+ Traditional finance UX

Cons

- Higher fees (1-7%)
- Fewer markets
- Lower liquidity
- US only
- No sports (CFTC restrictions)
- Limited API

Final Recommendation

For most traders:Polymarket offers better value with lower fees, more markets, and deeper liquidity. If you're comfortable with crypto and outside the US, it's the clear choice.

For US residents prioritizing compliance:Kalshi is the safer, legal option. You'll pay more in fees and have fewer markets, but you get regulatory protection and tax simplicity.

For serious traders: Consider using both. Kalshi for US-regulated markets, Polymarket (via VPN if permitted in your jurisdiction) for sports and international events.

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Polymarket vs Kalshi: Which Prediction Market is Better?