Guide

Kalshi vs Polymarket: How the Two Prediction Markets Compare

Kalshi and Polymarket are two of the largest prediction markets, where people trade contracts that pay out based on whether a future event happens. The clearest difference is structure: Kalshi was built from the start as a U.S. exchange regulated by the Commodity Futures Trading Commission (CFTC) and settled in dollars, while Polymarket grew up as a crypto-native platform settled in USDC, a dollar-pegged stablecoin. By 2026 both offer regulated U.S. access, but they reach it from opposite directions. A prediction-market price reflects the crowd's estimated probability of an outcome — it is information, not financial advice.

Regulation and corporate structure

Kalshi was founded in 2018 by Tarek Mansour and Luana Lopes Lara, two MIT graduates, and received CFTC approval in November 2020 to operate as a Designated Contract Market — making it widely regarded as the first fully regulated U.S. exchange dedicated to event contracts. It launched to the public in July 2021 and operates directly under CFTC oversight, more like a regulated derivatives venue than a betting site.

Polymarket, founded in 2020 by Shayne Coplan, took a different path. It began as a crypto-native platform and, in January 2022, settled CFTC charges for offering markets without registering, paying a civil penalty and winding down access for U.S. users. After federal investigations were closed in 2025, Polymarket acquired QCEX — a CFTC-licensed derivatives exchange and clearinghouse — and moved to re-enter the United States through a regulated structure. The result is effectively a dual setup: a large global exchange plus a CFTC-regulated U.S. arm.

Currency: dollars vs. stablecoin

Kalshi works entirely in U.S. dollars. You fund an account by bank transfer, debit card, or similar methods, and contracts are priced and settled in dollars — no crypto involved.

Polymarket settles in USDC, a stablecoin pegged to the U.S. dollar, and has historically run on Polygon, a low-cost blockchain network. In practice one USDC tracks one dollar, but the crypto rails mean there can be on-ramp steps, wallet considerations, and network mechanics that a purely dollar-based account avoids. For users comfortable with crypto, USDC can mean fast, low-cost movement of funds; for those who are not, it is added friction.

US availability

Both platforms are now accessible to eligible U.S. users, but the histories differ. Kalshi has been available to Americans since its 2021 launch, with state-level availability varying for certain market types over time. Polymarket was closed to U.S. residents from 2022 until its regulated return in 2025.

Because rules and state-by-state availability shift — particularly for sports-related contracts, which have drawn ongoing regulatory attention — confirm current access and eligibility directly on each platform rather than relying on a fixed snapshot. In 2026 the CFTC issued a proposed rulemaking on event contracts that, if finalized, could reshape which contracts are permitted — including which sports markets are allowed — so the regulatory picture remains in motion.

Market breadth, fees, and liquidity

Polymarket is known for wide-ranging, fast-moving markets spanning politics, crypto, world events, culture, and economics, and it has historically carried deep liquidity on headline questions. Kalshi offers a structured catalog across economics, politics, weather, financials, and more, with the assurance of operating inside a regulated exchange framework.

Fee structures differ and change frequently. Kalshi has typically used a per-contract trading fee that scales with price, plus possible deposit costs on certain methods. Polymarket long marketed minimal trading fees on its global platform but introduced category-based taker fees in 2026, with limit-order 'makers' often paying less or nothing and, in some cases, receiving rebates. Because both have revised pricing recently, check each platform's current fee schedule before comparing real costs. For liquidity, look at the order book depth and bid-ask spread on the specific market you care about — a thin market moves more on small trades regardless of platform.

Accuracy and how to read the odds

Prediction markets are often accurate because traders risk their own money on their beliefs, which tends to surface well-calibrated probabilities — but accuracy varies by market. High-volume, widely followed questions usually price more reliably than obscure or thinly traded ones, where a few participants can swing the odds.

Read a price as a probability: a contract trading at 65 cents implies roughly a 65 percent chance the market assigns to that outcome. Compare the same question across both platforms when you can; large gaps can reflect different user bases, liquidity, or resolution wording. Always check how a market resolves — the exact criteria and source — because two similar-sounding contracts can settle on different definitions.

When each is more useful

Kalshi tends to suit users who want a dollar-denominated account with no crypto, value operating inside a CFTC-regulated U.S. exchange, and follow economic, financial, and event-driven questions. Its structure appeals to people who treat event contracts like a regulated financial instrument.

Polymarket tends to suit users comfortable with stablecoins who want broad, fast-moving global markets and deep liquidity on major news, politics, and crypto questions. For reading the crowd's probability on a breaking story, its breadth and volume are a strength. Many people consult both: cross-checking the same question on each platform gives a fuller read on where the market consensus actually sits.