Polymarket vs Kalshi: Which CFTC-Regulated Prediction Market Offers Better Trading Conditions

Two major prediction markets operate under direct CFTC oversight in the United States: Polymarket and Kalshi. Both platforms allow traders to buy and sell binary outcome shares on real-world events—politics, sports, economics, and culture—priced between $0 and $1. The fundamental mechanics are identical: a YES share pays $1 if the outcome occurs, $0 if it does not. Yet the platforms diverge sharply on infrastructure, fees, market selection, and the leverage options available to traders. For a US trader choosing between them, or for an international user assessing Polymarket’s global availability, understanding those differences becomes essential to evaluating total trading cost and execution quality.

The regulatory designation itself—CFTC-regulated exchange—matters because it constrains both platforms’ operations and defines what protections apply to user funds. But regulation alone does not determine trading conditions. Polymarket runs on the Polygon blockchain with a stablecoin settlement layer, while Kalshi operates a more traditional centralized matching engine. Those architectural choices affect fee structure, liquidity, speed, and risk exposure in ways that persist regardless of which regulator oversees the account. This comparison examines the practical trade-offs across the two platforms so traders can match their priorities to the right venue.

Regulatory framework: CFTC oversight and geographic access

Both Polymarket US and Kalshi operate as registered derivatives clearing organizations or designated contract markets under CFTC authority, meaning they are subject to position limits, market surveillance, and customer fund segregation rules that centralized, unregulated platforms do not follow. For US traders, this translates to mandatory Know Your Customer (KYC) identity verification, restrictions on traders in certain jurisdictions, and regular compliance reporting. The CFTC framework protects traders from counterparty default through segregated customer accounts and margin requirements—but it also means both platforms must deny access to users in prohibited regions and refuse high-frequency or suspicious trading patterns.

Polymarket’s international presence, however, creates a regulatory split. Polymarket US serves Americans with full KYC. The international version of Polymarket operates in most countries outside the United States, Canada, and a list of 40+ banned jurisdictions that includes the UK, France, Germany, Italy, the Netherlands, Australia, and others. That geographic restriction is not arbitrary: it reflects regulatory decisions by the Financial Conduct Authority, ESMA, BaFin, CONSOB, and AFM, each of which has determined that prediction markets fall outside permitted trading activities or require licenses that Polymarket does not hold. Kalshi, by contrast, operates primarily as a US-regulated entity and does not offer an international platform; non-US traders do not have legal access.

For a US trader, KYC requirements are identical on both platforms—name, address, Social Security number, and verification of identity through third-party services. Both require proof of funds or income in some cases. The CFTC also imposes position limits on certain markets to prevent market manipulation, and both platforms enforce those limits automatically. The practical difference is that Polymarket’s blockchain settlement layer means positions are visible on-chain once settled, while Kalshi maintains centralized position records. Neither arrangement eliminates regulatory audit trails, but they create different operational workflows.

Fee structure: Makers, takers, and settlement costs

Fee design is where the platforms diverge most clearly. Polymarket charges taker fees that range from $1.00 to $1.75 per 100 shares depending on the market category, while makers pay zero. This means a trader buying 100 shares at $0.50 (betting YES at 50% probability) pays a $1.38 taker fee on top of the $50 cost of the shares themselves—a 2.76% fee on the notional value. The fee structure incentivizes passive liquidity provision (market making) and is transparent in the order confirmation screen.

Kalshi operates a different fee model: makers and takers both face fees, typically ranging from 0.2% to 0.5% depending on trade size and market category. For the same $50 trade, a Kalshi taker might pay $0.10 to $0.25, substantially lower than Polymarket’s fixed per-100-share schedule. Kalshi’s percentage-based fees also scale naturally with share price, so a $0.10 share trade costs proportionally less than a $0.90 trade. For high-frequency traders or those making many small positions, Kalshi’s fee advantage can be decisive.

Neither platform charges deposit or withdrawal fees directly; however, users must account for blockchain network costs. Polymarket uses Polygon and pUSD, a stablecoin backed 1:1 by USDC, which means moving funds on and off the platform involves Polygon gas fees—typically $0.50 to $2.00 per transaction during normal network conditions. Kalshi operates on a centralized system and does not impose network fees, though users must transfer funds to and from their bank account, which incurs standard ACH or wire fees depending on the payment method chosen.

The total cost picture therefore depends on trading frequency and position size. A trader making 50 small bets per month on Kalshi might spend 0.3–0.5% in fees per trade, totaling $7.50–$12.50 monthly on a $5,000 account. The same trader on Polymarket might spend $0.69 per 100 shares traded, or roughly $17.25–$34.50 per month, plus Polygon gas fees. For longer-term position holders who trade infrequently, that difference barely matters. For active traders, Kalshi’s percentage-based structure may be cheaper.

Market variety and liquidity depth

Polymarket markets span geopolitics, sports, finance, and entertainment with hundreds of active trading pairs. Markets range from “Will Candidate X win the 2028 US Presidential Election?” to “Will the Fed cut rates at the next FOMC meeting?” to sports outcomes and celebrity events. The diversity attracts traders with different interests and risk tolerances, though it also means liquidity is fragmented across many markets. Some Polymarket markets have deep order books and can accommodate large trades with minimal slippage; others may have only a few hundred dollars in available liquidity.

Kalshi also offers prediction markets on similar event categories, but with a smaller total number of active markets. Kalshi markets tend to be more concentrated on core categories—US elections, economic data releases, and some sports events—rather than offering the breadth of entertainment or niche geopolitical bets that Polymarket features. The trade-off is that fewer markets can mean deeper liquidity in each one, reducing execution slippage for large orders on major events.

For market resolution, Polymarket uses the UMA Optimistic Oracle, where UMA token holders dispute contested outcomes, combined with written market rules that define dispute procedures. Kalshi uses a centralized resolution process where Kalshi staff review evidence and rule on disputed outcomes. Both systems are designed to prevent fraud, but they operate differently: UMA is decentralized but slower and potentially contentious, while Kalshi’s centralized approach is faster but depends on the company’s judgment and integrity.

Leverage and perpetual futures

Polymarket offers perpetual futures markets with up to 20x leverage on certain underlying assets, allowing traders to amplify returns (and losses) on directional bets. A trader betting $100 with 20x leverage controls a $2,000 notional position; if the underlying moves 5% in their favor, they gain $100; if it moves 5% against them, they lose $100 and face margin liquidation. Perpetual futures require active risk management and are designed for experienced traders who understand leverage mechanics.

Kalshi does not offer leverage or perpetual futures. All Kalshi trades are binary outcomes at 1:1 leverage—traders can only lose what they invested, and gains are capped at the difference between their entry price and $1.00 (for YES positions) or $0.00 (for NO positions). This eliminates tail risk from liquidations but also removes the amplification that sophisticated traders seek. For conservative traders or those new to prediction markets, Kalshi’s structure is safer; for those seeking exposure to volatile markets with capital efficiency, Polymarket’s leverage options are more suitable.

Settlement layer and operational differences

Polymarket’s use of the Polygon blockchain and pUSD settlement creates transparency and programmability: traders can verify their positions on-chain, and settlement is atomic and irreversible once confirmed. However, this means users must be comfortable with blockchain wallets, managing private keys (if using self-custody), and understanding how network gas fees work. Polygon transactions confirm in seconds to minutes, so Polymarket trades settle quickly relative to traditional markets but can still face congestion during high-volume events.

Kalshi’s centralized settlement model is simpler from a user perspective: traders log in, place orders, and monitor their account balance on a traditional web interface. There is no blockchain wallet, no gas fee variability, and no need to understand stablecoins or blockchain fundamentals. Funds settle instantly to the Kalshi account, though deposits and withdrawals involve bank account linkage and ACH processing, which typically take one to three business days.

For traders using Polymarket, liquidity and price discovery depend partly on the health of the Polygon network and the availability of market makers willing to quote prices. During network congestion, gas fees spike and traders may experience slower order confirmation. polymarket also requires users to bridge USD into pUSD, adding a step and another potential friction point. Kalshi, operating a centralized system, has no such dependency; the trade-off is concentration of counterparty risk with Kalshi itself rather than distribution across the blockchain network.

Use case alignment: Choosing the right platform

Polymarket is optimal for traders who value market breadth, want exposure to unusual or niche prediction markets, prioritize long-term positions where leverage is attractive, and are comfortable with blockchain-native workflows. The 20x leverage on perpetuals appeals to sophisticated traders managing directional macro bets, and the international availability (outside restricted jurisdictions) makes Polymarket the only viable choice for non-US traders seeking CFTC-style protections in a major prediction market.

Kalshi suits traders who prioritize lower fees on frequent trading, want deeper liquidity in major events, prefer simplicity and centralized custody, and do not need leverage or exotic markets. Kalshi’s percentage-based fee structure is more forgiving for small trades, and the elimination of gas fees and blockchain complexity appeals to traders from traditional finance who expect a conventional brokerage interface.

A trader focused on US election outcomes might find Kalshi’s deeper order books and lower fees more valuable; a trader betting on geopolitical events worldwide, or seeking leverage on perpetual futures, would favor Polymarket. Neither choice is universally superior—they reflect different risk tolerances, technical comfort, and trading styles.

Compliance and dispute resolution in practice

Both platforms enforce CFTC position limits, conduct market surveillance, and maintain customer fund segregation. Disputes are handled differently: Polymarket disputes go to the UMA oracle, where token holders vote on contested outcomes, while Kalshi disputes are resolved by internal staff review. UMA voting is transparent and theoretically resistant to Polymarket censorship, but it is also slow—disputed markets may take weeks or months to resolve. Kalshi’s centralized approach is faster but concentrates authority with the company.

User protection under CFTC rules includes segregated customer accounts, so funds are held in a segregated account that cannot be used for the platform’s own operations. If Polymarket or Kalshi became insolvent, customer funds would be returned preferentially, though recovery procedures differ. Polymarket’s on-chain settlement makes balances transparent; Kalshi requires trusting the company’s internal accounting. Both arrangements comply with CFTC requirements, but the operational mechanics differ.