Every review on this page follows the same process: we score the platform across 9 weighted categories — regulation, fees, market selection, liquidity, user experience, withdrawals, deposits, tax tools, and support — using our published methodology. Public fee schedules, CFTC registration records, court filings, and hundreds of user reviews feed each score. Platforms can’t pay for placement, and the rubric is public so you can check our work.
Scores are updated when platforms change materially — each review carries a “Last updated” line and a changelog when a score moves.
All Platform Reviews, Ranked by Score
| Platform | Score | One-line verdict |
|---|---|---|
| Kalshi | 7.4 | Best overall: widest regulated markets, strongest track record; slow withdrawals |
| Polymarket | 7.1 | Best fees and liquidity; US platform now open to all iOS users |
| OG | 6.7 | Crypto.com’s exchange: easy funding and parlays; no limit orders |
| ProphetX | 6.7 | Sports exchange with back/lay trading; fees only on winnings |
| FanDuel Predicts | 6.4 | Easiest mainstream on-ramp; pricier fees, mobile-only |
| Underdog Predict | 6.3 | Event contracts inside the Underdog fantasy app; 27 states |
| Fanatics Markets | 6.2 | Broad categories and FanCash rewards; thin liquidity, bot-only support |
| Novig | 6.0 | Zero-commission sports trading — still a sweepstakes until its CFTC exchange ships |
| ADI Predictstreet | Not rated | FIFA’s official World Cup market; US access via Fanatics — profiled, not scored |
Head-to-Head Comparisons
If you’ve narrowed it to two platforms, the head-to-head pages score them category by category:
- Kalshi vs Polymarket — the top two, and a much closer fight since Polymarket US opened
- Kalshi vs FanDuel Predicts — depth versus ease of entry
For the full field in one place, see Best Prediction Market Platforms, updated July 2026 with all nine platforms.
How These Reviews Work
Weighted scoring. Regulatory safety counts 20% — if your money isn’t protected, nothing else matters. Fees, market selection, and liquidity count 15% each; UX and withdrawals 10%; deposits, tax tools, and support 5% each. The methodology page publishes every rubric.
Primary sources. Official fee schedules, CFTC registration records and filings, court documents, and app-store review analysis — cited in each review. When a fact can’t be verified, we say so rather than print a guess; that’s why ADI Predictstreet is profiled but not scored.
Independence. Some links earn us commissions. Rankings follow scores, scores follow the rubric, and several reviewed platforms have no affiliate relationship with us at all. Details in our affiliate disclosure and editorial policy.
New to all of this? Start with What Are Prediction Markets? — then come back and pick a platform.