Kalshi vs Polymarket: A Complete Comparison Prediction markets have moved from a niche corner of finance into mainstream trading, and two names dominate the space: Kalshi and Polymarket. Both
Prediction markets have moved from a niche corner of finance into mainstream trading, and two names dominate the space: Kalshi and Polymarket.
Both let users trade on the outcome of real-world events, but they're built on fundamentally different foundations: one is a federally regulated exchange, and the other is a blockchain-native platform now working its way back into US regulation.
This Kalshi vs Polymarket comparison breaks down how each platform actually works, based entirely on their own official documentation and regulatory filings.
It operates as a straightforward, dollar-denominated exchange. According to Kalshi's own site, it lists "event contracts," a CFTC-defined asset class where users buy Yes or No positions on whether something will happen, with contracts settling between $0 and $1.
Funding, trading, and withdrawals all happen in US dollars, and the experience looks close to a traditional brokerage app.
What is Polymarket?Polymarket takes a different technical route. Per its own documentation, It runs on Polygon, a proof-of-stake layer-two blockchain, with every trade denominated in USDC, a dollar-pegged stablecoin. Users connect a crypto wallet rather than a bank account, and all positions and settlements are publicly verifiable on-chain.
Polymarket's own frames this design choice around transparency and self-custody: funds sit in smart contracts rather than a company-controlled account.
Both platforms now operate under the same category of US federal oversight, though they arrived there differently.
Kalshi's:Kalshi has been a CFTC-regulated designated contract market (DCM) since 2020. A DCM is an exchange authorized to list futures, swaps, and event contracts under the Commodity Exchange Act, the same designation held by the Chicago Mercantile Exchange and Intercontinental Exchange (ICE).
Polymarket's:Polymarket's regulatory path took longer. The platform's original operating entity settled with the CFTC in 2022 for offering event contracts without proper registration, which blocked US users from the global platform for years.
It returned to full US legal status by acquiring QCEX, an existing CFTC-licensed derivatives exchange and clearinghouse, and relaunching as US under that license.
Notably, Intercontinental Exchange announced a strategic investment of up to $2 billion in Polymarket in October 2025, later confirming an additional $600 million cash investment in March 2026, tying one of Wall Street's biggest exchange operators directly to Polymarket's growth.
Both platforms cover an overlapping but distinct set of categories.
Kalshi: Kalshi's own market browser and Help Center organize contracts into politics, sports, economics, crypto, weather, and culture alongside financial markets like daily S&P 500 and Nasdaq contracts. Kalshi has leaned heavily into sports since late 2024, expanding from a politics-and-economics-only platform into a broad, fast-moving events exchange.
Polymarket: It similarly spans politics, sports, crypto, finance, tech, economics, culture, and weather, with geopolitical and world events markets kept permanently free of trading fees to encourage participation even in lower-liquidity topics.
Where they diverge: Where the two diverge most is underlying philosophy. Kalshi's contract creation is tightly controlled by the exchange itself under CFTC self-certification rules, while Polymarket's blockchain architecture was originally built to let markets resolve through more open, crowd-driven mechanisms, even as its US arm now operates within the same CFTC framework as Kalshi.
Fee structures differ in the details but follow a similar logic on both platforms: makers (traders who add resting liquidity) generally pay little or nothing, while takers (traders who fill an existing order immediately) pay the bulk of the cost.
Kalshi: Kalshi's official fee schedule charges taker fees using a formula tied to the contract's implied probability, generally described as peaking when a contract trades near 50 cents and shrinking toward the extremes. Maker orders that rest on the book are typically fee-free, and charges no settlement fee.
Polymarket: Polymarket's Help Center confirms that most markets, including all geopolitical and world-events contracts, carry no trading fees at all and that charges nothing for depositing or withdrawing USDC.
Where fees do apply, per Polymarket's own, they follow a category-based taker fee that also peaks near 50-cent contracts and drops toward zero at the extremes, with maker orders remaining fee-free across the board.
Metric
Kalshi Data
Polymarket's Data
Trading Volume
Annualized trading volume rose from $52B to $178B in six months
Strong growth, but recent dollar volume trails
Market Activity
Reportedly accounts for over 90% of US prediction market activity
Strong international activity and expanding market presence
Growth Driver
Rapid expansion into sports prediction contracts
International expansion and ICE partnership
Institutional Support
Raised $1B Series F at a $22B valuation
ICE's cumulative investment is approaching $2B
US Market Share
Holds the larger share of US-based trading activity as of mid-2026
Smaller US share compared with Kalshi
Overall Activity
Currently ahead in trading volume and US activity
Growing strongly, particularly through international reach
There's no single right answer, the better platform depends on what a trader values.
Kalshi suits: Users who want a familiar, dollar-based exchange experience with direct CFTC oversight and no crypto wallet required.
Polymarket suits: Users comfortable with crypto rails, drawn to its transparent on-chain settlement and broader international footprint, now backed by the same federal licensing structure as Kalshi through its QCEX-based US relaunch.
Anyone weighing this decision should also factor in which specific markets and fee categories matter most to their own trading style, since both platforms structure pricing differently by category.
Kalshi and Polymarket have converged on the same regulatory endpoint; both now operate CFTC-licensed exchanges in the US, even though they started from opposite ends: one as a dollar-based DCM from day one and the other as a blockchain-native platform that fought its way back into legal US operation.
This rivalry between the two platforms ultimately comes down to funding preference, fee tolerance by category, and which platform's market selection lines up with what a trader wants to forecast.
As both continue raising capital from major institutional backers, that competition looks set to keep shaping how prediction markets evolve in the US.
This article is for educational and informational purposes only and should not be considered financial or investment advice. Always conduct your own research before making investment decisions.
