Crypto Prediction Market Comparison: Polymarket vs Kalshi

Prediction Market Platforms Compared

Prediction markets allow traders to buy and sell contracts on the outcomes of real-world events: elections, sports, economic data releases, crypto price milestones, and more. Each contract settles at $1 (if the event occurs) or $0 (if it does not), with market prices reflecting the crowd's implied probability. The sector grew from roughly $16 billion in annual volume in 2024 to over $44 billion in 2025, and monthly volumes crossed $20 billion by early 2026.

Two platforms dominate: Polymarket (crypto-native, built on Polygon) and Kalshi (CFTC-regulated, USD-denominated). Together they account for over 97% of global prediction market volume. Several smaller platforms serve niche use cases, and major entrants like DraftKings, Robinhood, and Crypto.com launched prediction market products in late 2025 and early 2026. The following table summarizes the leading platforms.

Polymarket: Crypto-Native Market Leader

Polymarket is the largest crypto-native prediction market. It runs on Polygon, settles in USDC (via pUSD, a 1:1 USDC-backed collateral token introduced in April 2026), and uses the UMA Optimistic Oracle for market resolution. In March 2026, Polymarket became the first prediction market to exceed $10 billion in monthly trading volume ($10.57B), with 840,000 monthly active wallets by February 2026.

Polymarket's resolution process works as follows: after a market closes, an approved proposer submits an outcome to the UMA oracle, posting a $750 USDC bond. A two-hour dispute window opens. If no one challenges the proposed resolution, it becomes final and the smart contract distributes funds to winning shareholders automatically. If disputed, UMA token holders vote on the correct outcome. This system has faced scrutiny: in June 2026, a $60M+ dispute over a Strategy (formerly MicroStrategy) Bitcoin sale revealed that nine anonymous wallets control nearly half of UMA voting power.

Polymarket was barred from the US in January 2022 after a $1.4 million CFTC settlement. It re-entered the US market in late 2025 after acquiring QCEX, a CFTC-licensed designated contract market and clearinghouse, for $112 million. The CFTC granted a no-action letter in September 2025 and an amended order of designation in November 2025. As of mid-2026, the US version focuses on sports markets, with other categories expected to follow.

Kalshi: Federally Regulated Exchange

Kalshi operates as a CFTC-regulated Designated Contract Market, the first federally regulated exchange dedicated to event contracts. All contracts are denominated in US dollars and settle at $1.00 (yes) or $0.00 (no). Users fund accounts via ACH, debit card, or (as of March 2026) cryptocurrency deposits through a partnership with Mesh, which connects 300+ wallets and exchanges.

Kalshi's landmark legal victory came in September 2024, when a federal district court ruled that election contracts "do not involve unlawful activity or gaming" under the Commodity Exchange Act. The CFTC voluntarily dismissed its appeal in May 2025. This cleared the path for regulated political and sports prediction markets in the US.

Volume growth has been explosive: Kalshi processed $23.8 billion in 2025 (up 1,108% year-over-year) and reached a $100 billion lifetime volume milestone in May 2026. Sports contracts drive roughly 85% of Kalshi's volume. The platform raised $1 billion in its Series E at an $11 billion valuation in late 2025, and has since expanded into commodities, art market predictions, and CFTC-approved Bitcoin perpetual futures.

Fee Structure Comparison

Fee models differ significantly across platforms. Polymarket uses category-based taker fees with free maker orders. Kalshi uses a probability-weighted formula where fees scale with uncertainty: the maximum fee occurs at 50/50 odds and approaches zero for high-conviction trades near $0.01 or $0.99.

Polymarket's US-regulated exchange uses a simplified flat structure: 0.30% taker fee with a 0.20% maker rebate, capped at $1.25 per 100 contracts. For the international platform, taker fees range from 0.75% (sports) to 1.80% (crypto), with geopolitical markets entirely fee-free. Kalshi's formula is 7¢ × C × (1 - C) per contract, where C is the contract price. At 50¢ (maximum uncertainty), the fee is 1.75¢. At 10¢ or 90¢, it drops to 0.63¢.

Market Categories and Coverage

Both leading platforms cover a broad range of event types, though their strengths differ. Polymarket has historically led in political and crypto markets, while Kalshi dominates sports volume. Both expanded categories aggressively through 2025 and 2026.

Polymarket categories:

• Politics (global elections, policy outcomes)
• Sports (NFL, NBA, NHL, MLB, MLS, tennis, golf)
• Crypto (token prices, regulatory events, protocol milestones)
• Geopolitics and world events (fee-free)
• Finance, economy, weather, culture, technology

Kalshi categories:

• Sports (85% of volume: NFL, NBA, MLB, NCAA, FIFA World Cup)
• Politics (all 34 Senate seats, 435 House seats, governors in 2026)
• Economics (Fed rate decisions, inflation, jobs reports)
• Crypto (Bitcoin/Ethereum price milestones)
• Commodities, entertainment, art markets (launched 2026)

Stablecoins and Settlement Infrastructure

Prediction markets are one of the largest real-world use cases for stablecoins. Polymarket runs entirely on USDC: users deposit USDC (or fiat, which is converted), receive pUSD (a 1:1 USDC-backed token), and trade with pUSD as collateral. Winning positions pay out in pUSD, redeemable for USDC at any time. This model leverages the transparency and programmability of smart contracts for automated settlement.

Kalshi takes the opposite approach: all contracts settle in US dollars through a CFTC-regulated clearinghouse. Users fund accounts with bank transfers or debit cards. However, Kalshi began accepting crypto deposits in March 2026, and Bitcoin has since become its largest deposit source, signaling convergence between fiat and crypto settlement rails.

For a broader view of how stablecoins function across different applications, see our stablecoin comparison tool. The growing role of stablecoins in prediction markets intersects with the regulatory frameworks established by the GENIUS Act, which defines requirements for stablecoin issuers operating in the US.

Oracles and Resolution Mechanisms

How a prediction market determines outcomes is arguably its most critical design decision. Incorrect or manipulable resolution can undermine the entire system.

Polymarket uses the UMA Optimistic Oracle: outcomes are proposed on-chain, and accepted as correct unless disputed within a two-hour window. If disputed, UMA token holders vote. This is efficient for most markets but introduces governance risk: concentrated token holdings can influence disputed outcomes. Polymarket logged over 1,150 disputed markets in the first half of 2026, exceeding the full-year 2025 total.

Kalshi avoids oracle risk entirely by using centralized resolution. The exchange determines outcomes based on predetermined official sources (league statistics, government agencies, regulatory filings) and settles contracts within hours. This model sacrifices decentralization for reliability and regulatory compliance.

Azuro uses an AMM-style peer-to-pool model where liquidity providers deposit stablecoins into pools that serve as the counterparty to all bets. Outcomes are resolved through a combination of data feeds and protocol governance.

US Regulatory Landscape

The regulatory environment for prediction markets shifted dramatically between 2024 and 2026. In September 2024, a federal court ruled in Kalshi's favor that political event contracts are legal under the Commodity Exchange Act. The CFTC dropped its appeal in May 2025. Polymarket acquired a CFTC-licensed exchange in July 2025 and resumed US operations by late 2025.

On June 10, 2026, the CFTC issued a Notice of Proposed Rulemaking establishing a formal framework for event contracts. The proposed rule clarifies that election contracts are not gambling, permits team-outcome sports contracts, and restricts contracts involving terrorism, assassination, or individual player performance. The comment period closes July 27, 2026.

State-level conflict remains active. At least 12 states have filed enforcement actions against prediction market operators, with some classifying event contracts as gambling rather than derivatives. In April 2026, the DC Circuit affirmed that CFTC jurisdiction preempts state gaming laws for sports event contracts. Multiple bills in Congress, including the bipartisan Prediction Market Act of 2026 (S. 4469), aim to establish insider trading rules and prohibit government officials from trading on event contracts.

Alternative and Emerging Platforms

Beyond the two dominant platforms, several alternatives serve specific niches:

Azuro is a decentralized prediction market protocol on EVM-compatible chains, focused on sports betting. It operates as infrastructure: third-party apps route bets to AMM liquidity pools, with over $530 million in cumulative volume processed across dozens of apps. LPs earn stablecoin yield from betting activity.

Drift BET launched on Solana as a prediction market built on Drift Protocol's existing DEX infrastructure, supporting 30+ cryptocurrencies as collateral. The platform suffered a $285 million exploit in April 2026 that significantly impacted its reputation and adoption.

Augur, one of the original decentralized prediction markets on Ethereum, is undergoing a reboot by the Lituus Foundation. The team released a new whitepaper proposing a modular oracle design and is planning a token fork in summer 2026. The original Augur v2 platform had minimal activity for years before this effort.

Major new entrants in 2025 and 2026 include DraftKings Predictions (CFTC-regulated, available in 38 states), Crypto.com's OG (launched February 2026), Robinhood Sports (zero commissions), and FanDuel Predicts (partnership with CME Group, available in all 50 states). Binance launched Predict.Fun on BNB Chain in March 2026.

Industry Growth and Outlook

Prediction market volume has grown at an extraordinary rate. Combined Kalshi and Polymarket volume grew from under $5 billion per month in September 2025 to over $20 billion per month by early 2026. Bernstein projects the sector will reach $1 trillion in annual volume by 2030, implying roughly 80% compound annual growth from 2025 levels.

Open interest across prediction markets exceeded $1 billion for the first time in early 2026, with Polymarket and Kalshi each contributing roughly $400 million to $500 million. The entry of established sportsbooks and financial platforms signals prediction markets are transitioning from crypto-native experimentation to mainstream financial infrastructure.

Frequently Asked Questions

What is a crypto prediction market?

A crypto prediction market is a platform where users trade contracts on real-world event outcomes using cryptocurrency or stablecoins. Each contract settles at $1 (if the event happens) or $0 (if it does not). The market price at any given time reflects the crowd's implied probability of the outcome. Blockchain-based prediction markets use smart contracts for automated settlement and oracles to bring off-chain event data on-chain.

Is Polymarket legal in the United States?

Yes, as of late 2025. Polymarket acquired a CFTC-licensed exchange (QCEX) for $112 million in July 2025 and received CFTC approval to resume US operations in November 2025. The US version currently focuses on sports markets, with other categories expected as regulatory approval expands. However, some states have issued cease-and-desist orders, and state-level legality varies.

What is the difference between Polymarket and Kalshi?

Polymarket is crypto-native: it runs on Polygon, settles in USDC, and uses a decentralized oracle (UMA) for resolution. Kalshi is a CFTC-regulated exchange that settles in US dollars and uses centralized resolution based on official data sources. Polymarket has historically led in political and crypto markets, while Kalshi dominates sports volume. Both now operate legally in the US under CFTC oversight.

How do prediction markets use stablecoins?

Crypto-native prediction markets like Polymarket use stablecoins as the settlement currency. Traders deposit USDC, which is converted to a platform token (pUSD on Polymarket) for trading. Winning positions pay out in stablecoins, providing dollar-denominated returns without traditional banking infrastructure. This makes prediction markets accessible globally and enables instant settlement through smart contracts. For a comparison of the stablecoins used across platforms, see our stablecoin comparison.

What are the fees on Polymarket?

Polymarket charges taker fees that vary by market category: 0.75% for sports, 1.00% for politics, 1.80% for crypto, and 0% for geopolitical markets. Maker orders (limit orders) are free on all markets, and makers receive daily USDC rebates. The US-regulated exchange uses a flat 0.30% taker fee with a 0.20% maker rebate. There are no settlement, deposit, or withdrawal fees beyond Polygon network gas costs (typically under $0.01).

How are prediction market outcomes resolved?

Resolution mechanisms vary by platform. Polymarket uses the UMA Optimistic Oracle: a proposer submits the outcome on-chain with a bond, and it is accepted unless disputed within two hours. Disputed markets go to a vote by UMA token holders. Kalshi uses centralized resolution based on official sources (league stats, government data). Decentralized platforms like Azuro use a combination of data feeds and protocol governance. The accuracy and trustworthiness of the resolution mechanism is a critical differentiator between platforms.

Can you make money on prediction markets?

Prediction markets offer profit opportunities when a trader's assessment of an event's probability differs from the market price. If a contract trades at $0.30 and the event occurs, the trader earns $0.70 per contract (minus fees). Liquidity providers on platforms like Azuro earn stablecoin yield from the spread between betting activity and payouts. However, prediction markets carry risk: contracts can expire worthless, oracle disputes can delay or alter payouts, and liquidity varies significantly across markets.

This tool is for informational purposes only and does not constitute financial, investment, or legal advice. Prediction market trading involves risk of loss. Data is approximate and based on publicly available information as of mid-2026. Trading volumes, fee structures, regulatory statuses, and platform availability change frequently. Prediction market legality varies by jurisdiction. Always verify current data and consult applicable regulations before trading.