Compare prediction market platforms on rule clarity, resolution transparency, dispute handling, regulator status, and public documentation. See how Kalshi, Polymarket, PredictIt, and others stack up.
Platforms Scored
4
Highest Score
78/100
Dimensions
5
Trust Events
6+
The key takeaway from this page
Which platforms explain their rules clearly — and which don't?
Kalshi
7.5 / 10
PredictIt
7.0 / 10
Kalshi
10.0 / 10
Kalshi
Rule-amendment controversy
Platform scores compared
| Rank | Platform | Score |
|---|---|---|
| 1 | Kalshi | 78/100 |
| 2 | PredictIt | 74/100 |
| 3 | Polymarket | 68/100 |
| 4 | Robinhood (via Kalshi) | 63/100 |
| 5 | Sporttrade | 61/100 |
Detailed dimension scores
| Platform | Rules | Resolution | Disputes |
|---|---|---|---|
| Kalshi | 7.5 | 7 | 6 |
| PredictIt | 7 | 7.5 | 7 |
| Polymarket | 6 | 6.5 | 5 |
| Robinhood (via Kalshi) | 6 | 6 | 5.5 |
| Sporttrade | 6.5 | 6 | 5.5 |
Each dimension scored 1–10. Higher is better.
Timeline of platform controversies
Our methodology explained
Rule Clarity
Are contract terms unambiguous and published before trading opens?
Resolution Transparency
Is the resolution process visible and well-documented?
Dispute Visibility
Can users see outcomes of challenges and appeals?
Public Documentation
Are rules, APIs, policies, and resolution criteria publicly accessible?
Regulatory Accountability
Is there meaningful external oversight (CFTC, state, or other)?
This is an editorial scorecard based on publicly available evidence, not a mathematical model. Scores reflect our assessment as of April 2026. We update this page as platforms change their practices or new trust events occur. This is not investment advice.
Start with the mechanics, pricing, and settlement basics.
Compare fees, spreads, and platform cost structure.
Understand the federal and state legal framework.
See the biggest differences between the two leading platforms.
Learn how contracts resolve and what sources determine the outcome.
Review tax treatment, reporting, and common pitfalls.
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