Which platform is best for new US traders?

Kalshi. It's federally-regulated, USD-funded, has the broadest market mix (politics, sports, economics, culture), and the smoothest onboarding for US bank users.

Which platform has the lowest fees?

Kalshi charges no commission on most markets and earns from the bid-ask spread. Polymarket charges a small spread plus gas. Sportsbook-style platforms (PrizePicks, Underdog) build margin into the lines.

Can US traders use Polymarket?

Yes, through Polymarket's US-legal perpetual-futures product launched in 2026. Direct prediction-market trading on the Polygon order book remains restricted for US users.

Which platform is best for sports?

Kalshi for game outcomes and prop-style binary markets; Sleeper, PrizePicks, and Underdog for parlay-style player props.

Platforms

Every legal US prediction market, ranked.

Independent reviews of every federally-regulated event-contract platform open to US traders — Kalshi, Polymarket, Sleeper Picks, PrizePicks, Underdog. Rankings reflect regulatory standing, liquidity, product quality, and fit for US traders. Updated monthly.

Five federally-regulated event-contract platforms accept US traders in 2026: Kalshi, Polymarket (US perpetuals), Sleeper Picks, PrizePicks, and Underdog Fantasy.

Polymarket

The world's largest prediction market — now live on iPhone in the US.

4.7

World CupSportsPoliticsCulture

Read Polymarket reviewSign up at Polymarket →iPhone app only — open this page on iPhone to claim.

18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.

Rebet

Social-first prediction markets — 100% deposit match up to $100 on the mobile app.

4.2

SocialSportsMobile-firstWorld Cup

Read Rebet reviewSign up at Rebet →

Kalshi

The regulatory leader.

4.7

World CupSportsPoliticsEconomicsCulture

Read Kalshi reviewSign up at Kalshi →

Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.

Crypto.com / OG

Built for crypto-native traders. Deep regulated liquidity on global sport.

4.2

World CupCryptoSportsMacro

Read Crypto.com / OG reviewSign up at Crypto.com / OG →

Novig

The sharp trader's exchange. No limits on winners.

4.4

World CupSportsSharpExchange

Read Novig reviewSign up at Novig →

Sleeper

Sports-first. Social-native. Built for the group chat.

4.3

SportsSocialWorld CupNFLNBA

Read Sleeper reviewSign up at Sleeper →

Chalkboard

Player props, simplified.

4.0

SportsPlayer PropsNBANFL

Read Chalkboard reviewSign up at Chalkboard →

Choosing a prediction market platform

Which platform is best for new US traders?: Kalshi. It's federally-regulated, USD-funded, has the broadest market mix (politics, sports, economics, culture), and the smoothest onboarding for US bank users.
Which platform has the lowest fees?: Kalshi charges no commission on most markets and earns from the bid-ask spread. Polymarket charges a small spread plus gas. Sportsbook-style platforms (PrizePicks, Underdog) build margin into the lines.
Can US traders use Polymarket?: Yes, through Polymarket's US-legal perpetual-futures product launched in 2026. Direct prediction-market trading on the Polygon order book remains restricted for US users.
Which platform is best for sports?: Kalshi for game outcomes and prop-style binary markets; Sleeper, PrizePicks, and Underdog for parlay-style player props.