Polymarket vs Kalshi (2026) | Fees, Liquidity, Markets & More

Polymarket and Kalshi are the two largest prediction market platforms in 2026, but they serve very different audiences. Polymarket is the global leader available in 160+ countries, while Kalshi is a US-focused, CFTC-regulated exchange.

The short version: If you’re outside the United States, Polymarket is the clear choice — lower fees, deeper liquidity, better odds, and no KYC. If you’re in the US and want a simple, regulated prediction market with cash deposits, Kalshi is your main option.

Quick Comparison

Fees

This is where the difference is most significant for active traders.

Polymarket uses a category-based fee structure with peak effective rates ranging from 0.75% on sports to 1.80% on crypto. Most categories fall between 1.00% and 1.50%. Maker orders receive rebates of 20-50%.

Kalshi charges higher fees on most markets.

The fee difference may seem small on a single trade, but it compounds significantly over time. An active trader placing hundreds of trades will pay substantially more in fees on Kalshi than on Polymarket. Lower fees directly translate to better returns.

For a complete breakdown of Polymarket’s fee structure, see our Polymarket Fees Explained guide.

Liquidity and Odds

This is the other major differentiator — and arguably the most important one for traders.

Polymarket has deep liquidity on most markets, with millions of dollars in daily volume on popular markets. This means:

• Tighter spreads — Less difference between the buy and sell price
• Better odds — You get closer to the “true” probability
• Less slippage — Large orders fill closer to the displayed price
• More trading opportunities — Active markets with constant price movement

Kalshi has lower liquidity on most markets. This means wider spreads and worse effective odds for traders. On less popular markets, you may struggle to fill orders at reasonable prices.

Why this matters: If Polymarket prices a market at 60/40 (Yes/No) with a 1-cent spread, Kalshi might price the same market at 62/38 with a 3-5 cent spread. On Polymarket you’re buying at closer to the true probability. On Kalshi, you’re paying a wider spread on top of higher fees.

A trader will always end up worse off in the long run on Kalshi because of the combination of higher fees and worse odds from lower liquidity.

Market Categories

Polymarket covers a wide range:

• Politics
• Sports
• Crypto
• Finance
• Economics
• Culture
• Weather
• Tech

Kalshi covers:

• Politics
• Economics
• Finance
• Events
• Weather

Polymarket has broader coverage, particularly in sports, crypto, culture, and tech — categories that Kalshi doesn’t cover or has minimal market selection in.

Availability and Access

This is where Kalshi has its main advantage.

Kalshi is available in the United States. It claims to be legal in all 50 states because it’s CFTC-regulated as an exchange, not a sportsbook. However, some states are actively challenging this classification, so the legal landscape may evolve.

Polymarket’s international exchange is blocked in the US. While a separate Polymarket US exchange exists, it’s invite-only and limited to sports betting. For US residents wanting prediction markets on politics, economics, and other categories, Kalshi is currently the primary option.

For international users, Polymarket is available in 160+ countries while Kalshi is US-only. There’s no contest here.

Signup and KYC

Polymarket: No KYC. Sign up with Google, email, or a crypto wallet in under 2 minutes. Start trading immediately.

Kalshi: Full KYC required. You need to provide government-issued ID and personal information. The verification process takes several minutes and may require additional time for manual review.

For users who value privacy or want to start trading quickly, Polymarket’s zero-KYC approach is a significant advantage.

Deposits

Kalshi wins on simplicity here. You can deposit USD directly via bank transfer or debit card. No crypto knowledge required. This is straightforward for anyone with a US bank account.

Polymarket requires cryptocurrency — specifically USDC. You can deposit 22 different tokens across 13 chains, connect Coinbase, or use card/Apple Pay/Google Pay on-ramps (with higher fees). If you’ve never used crypto before, there’s a learning curve.

For a complete guide: How to Deposit on Polymarket

Mobile Experience

Kalshi has a dedicated mobile app for iOS and Android. It’s well-designed and provides a native experience.

Polymarket (international exchange) does not have a mobile app. You trade through the mobile browser, which works but isn’t as polished as a native app.

This is a genuine advantage for Kalshi. For traders who primarily use their phone, Kalshi provides a better mobile experience.

Regulation

Kalshi is regulated by the CFTC (Commodity Futures Trading Commission) as a designated contract market. This provides regulatory clarity and consumer protections that come with operating within the US financial system.

Polymarket is not regulated by any single financial authority. Trades execute via smart contracts on the Polygon blockchain. This means more freedom (no KYC, global access) but less regulatory protection.

For risk-averse users who prioritize regulatory oversight, Kalshi’s CFTC regulation is reassuring. For users who prioritize privacy, lower fees, and global access, Polymarket’s approach is preferable.

Who Should Use Each Platform?

Choose Polymarket if you:

• Are outside the United States
• Want the lowest fees and best odds
• Value deep liquidity and tight spreads
• Want to trade crypto, sports, culture, and tech markets
• Prefer no KYC — sign up and trade in under 2 minutes
• Are comfortable with (or willing to learn) cryptocurrency
• Are a serious trader focused on maximizing returns

Choose Kalshi if you:

• Are in the United States and can’t access Polymarket’s international exchange
• Want to deposit USD directly with a bank account or debit card
• Prefer a CFTC-regulated platform with traditional financial protections
• Want a mobile app
• Are a casual user who values simplicity over optimal pricing
• Don’t want to learn anything about cryptocurrency

The Bottom Line

For international users, this comparison isn’t close. Polymarket offers lower fees, deeper liquidity, better odds, more market categories, and no KYC requirements. Active traders will see significantly better returns on Polymarket purely from the fee and spread advantages.

Kalshi’s strengths — US availability, CFTC regulation, cash deposits, and a mobile app — make it a viable option for US residents who want a simple, regulated prediction market experience. But users should understand that they’re paying for that convenience through higher fees and worse odds from lower liquidity.

If you’re willing to spend 15 minutes learning how to deposit crypto, Polymarket is the better platform by every metric that matters for your returns.

Related

• All Reviews & Comparisons — Browse every review
• Polymarket Review 2026 — Full review after 2 years of trading
• Best Prediction Markets 2026 — How every platform compares
• What Is Polymarket? — Complete platform overview
• How to Sign Up for Polymarket — Create your account
• How to Trade on Polymarket — Start trading with market or limit orders
• Polymarket Fees Explained — Detailed fee breakdown (or use the fee calculator)
• How Prediction Markets Work — Understand the mechanics
• Is Polymarket Available in Your Country? — Check access with our country checker