Polymarket vs Kalshi: Which Should You Use?

Two Platforms, Two Philosophies

Polymarket and Kalshi represent two fundamentally different approaches to prediction markets. Polymarket is a crypto-native, globally accessible platform that prioritizes liquidity and market breadth. Kalshi is a U.S.-regulated exchange that prioritizes compliance and traditional finance accessibility. Understanding their differences is crucial for choosing the right platform.

Regulation and Legal Status

Polymarket operates on the Polygon blockchain from outside the United States. Following a 2022 CFTC settlement, U.S. residents are prohibited from trading on the platform. It's accessible in most other countries without KYC requirements for basic trading.

Kalshi is CFTC-regulated, operating as a designated contract market. It's the only legal prediction market for U.S. residents. Full KYC/AML verification is required, providing regulatory protections but also adding friction to the onboarding process.

Liquidity and Volume

Polymarket consistently leads in both volume and liquidity. Major markets like presidential elections have seen billions in cumulative volume, with order books deep enough to handle six-figure trades without significant slippage.

Kalshi has growing but still significantly lower liquidity. Position limits and a smaller user base mean that large orders can move prices more. However, liquidity has been improving rapidly, especially in popular economic markets.

Market Selection

Polymarket offers hundreds of active markets at any time, spanning politics, crypto, sports, entertainment, world events, and more. New markets can be created relatively quickly to respond to breaking news.

Kalshi has a more curated selection. Markets must go through regulatory approval, which limits both the number and speed at which new markets appear. Kalshi excels in economic markets (Fed decisions, CPI data) but has fewer niche or novelty markets.

Fees Comparison

Feature	Polymarket	Kalshi
Trading fees	None	~7% of profits
Deposit fees	Crypto gas fees (minimal)	None (bank transfer)
Withdrawal fees	Crypto gas fees	None

Deposit and Withdrawal

Polymarket requires USDC on the Polygon network. Users need to be comfortable with cryptocurrency wallets, bridges, and stablecoins. While this adds complexity, it also enables near-instant deposits and withdrawals.

Kalshi accepts bank transfers and debit cards in USD. Deposits are straightforward for anyone with a U.S. bank account, but withdrawals can take 1–3 business days.

User Experience

Both platforms offer clean, modern interfaces. Polymarket's design emphasizes market discovery and social features, showing market comments and trending markets prominently. Kalshi has a more traditional trading interface that will feel familiar to anyone who's used a brokerage.

Which Should You Choose?

Choose Polymarket if: You're not a U.S. resident, you're comfortable with crypto, you want the deepest liquidity, the widest market selection, and zero trading fees.

Choose Kalshi if: You're a U.S. resident, you prefer USD deposits, you value regulatory protections, or you primarily trade economic and political markets.

Use both if: You want to compare prices across platforms to find the best odds, or you want to trade markets that are only available on one platform. Price discrepancies between the two platforms can also create arbitrage opportunities.