Kalshi vs Polymarket — and every other US prediction market.
Head-to-head comparisons of the major prediction-market apps open to US traders. Compare Kalshi, Polymarket, ProphetX, Novig and Sleeper on fees, liquidity, market depth and World Cup 2026 coverage.
ProphetX · Trade $50, Earn $75!
WCPREDICTSClaim21+ · T&Cs apply
New users only. T&Cs apply. ProphetX's minimum age is 18 (or the local age of majority if higher); we recommend 21+. Not available in Nevada. Trading involves risk.
ProphetX · Trade $50, Earn $75!
WCPREDICTS
New users only. T&Cs apply. ProphetX's minimum age is 18 (or the local age of majority if higher); we recommend 21+. Not available in Nevada. Trading involves risk.
Last checked October 14, 2026
Side-by-side comparisons of the major prediction-market apps, written for US traders choosing between Kalshi, Polymarket, ProphetX, Novig and Sleeper.
- Kalshi today. Polymarket as its US relaunch matures.
- Kalshi for dedicated prediction market traders. Crypto.com if you already use it for crypto.
- Novig for sharp sports trading. Kalshi for broad coverage. Most serious traders use both.
- Kalshi for most the US traders. Sleeper if your fantasy life already runs through the app.
- Chalkboard if you trade player props. Sleeper if you trade games and teams, especially with friends.
- Sleeper if you already use it for fantasy. Rebet if you don't, and want cross-sport social trading.
Frequently asked questions
Kalshi vs Polymarket — which wins for US traders?
Kalshi wins on regulation, USD funding, and ease of use. Polymarket wins on market depth and global political coverage, but most US traders start on Kalshi and add Polymarket later for specific markets.
Are Polymarket perpetuals legal in the US?
Available to eligible residents (as of October 3, 2026); check current state rules. Polymarket's 2026 US perpetual-futures product is offered through a CFTC-registered venue and is open to US residents (Polymarket's minimum age is 18; we recommend 21+).
What's the best platform for sports prop bets?
For binary game-outcome markets, Kalshi. For parlay-style player props, Sleeper Picks, PrizePicks, or Underdog Fantasy.
21+ · T&Cs apply · Terms
New users only. T&Cs apply. ProphetX's minimum age is 18 (or the local age of majority if higher); we recommend 21+. Not available in Nevada. Trading involves risk.