Polymarket Review

Polymarket is the largest prediction market in the world by daily volume. Built on Polygon and settled in USDC, it runs a real central-limit order book so prices update tick-by-tick rather than through an automated market maker. It re-entered the US market in 2025 through the CFTC-registered exchange QCX, which brings it into the same regulated bracket as Kalshi while keeping its global, crypto-native trading rails.

Polymarket charges zero trading fees on both maker and taker orders. Your only cost is Polygon gas on deposits and withdrawals, which is typically a fraction of a cent per transaction. Spreads on the top political and crypto markets are usually one to two cents wide, so total cost of execution is the lowest of any platform we track.

Headline election, crypto-price and macro markets routinely hold six-figure order books, and the site lists thousands of active markets across politics, sports, crypto, culture and current events. Long-tail markets can still be thin, so we recommend using limit orders and checking depth before sizing up. The catalogue refreshes daily.

The interface is clean, fast and desktop-first, with a solid mobile web experience and a native app. Onboarding takes minutes if you already hold USDC — connect a wallet, or sign in with email and fund by card via MoonPay. New users unfamiliar with self-custody wallets face a learning curve, but Polymarket now hides most of that complexity behind an email login.

Following its 2025 re-entry to the US, Polymarket trades under the CFTC-registered QCX venue for American users, and continues to operate globally under its established DeFi settlement layer. Funds are held in your own wallet or in the exchange's segregated smart contracts rather than in a broker's balance sheet, which removes traditional counterparty risk but adds smart-contract and self-custody risk. There has been no material security incident since launch in 2020.

Polymarket is accessible to most European users through its global web app. The UK is currently restricted, and a handful of other jurisdictions require KYC or block access. EU traders typically fund via crypto wallet or card and withdraw USDC to a personal wallet or exchange for fiat off-ramping. Always check your local rules before trading.

Against Kalshi, Polymarket wins on fees, liquidity and market variety but loses on US regulatory clarity for retail. Against Manifold or Metaculus, Polymarket is the only one of the four with real cash markets at scale. Probly currently sits at the top of the Arena leaderboard for overall experience, while Polymarket remains the best-known global crypto prediction market by daily volume. If you want dollar-denominated, regulated exposure inside the US, Kalshi is the safer pick.

For serious traders who want deep liquidity, zero fees and the widest selection of live markets, Polymarket is the clear choice.