Polymarket vs Good Judgment Open
A detailed head-to-head comparison of Polymarket and Good Judgment Open — pricing, features, and which one wins for different use cases.
Polymarket
The world's largest decentralized prediction market for elections, crypto, sports, and world events
Polymarket is the dominant decentralized prediction market platform, running on Polygon and processing hundreds of millions of dollars in trading volume during major events like US presidential electi…
Full review →Good Judgment Open
The public forecasting tournament from the Superforecasting researchers
Good Judgment Open is the public forecasting platform run by Good Judgment Inc., the organisation born out of the research that produced the concept of 'Superforecasters' — ordinary people who, with t…
Full review →Feature Comparison
| Feature | Polymarket | Good Judgment Open |
|---|---|---|
| Settlement Mechanism | UMA optimistic oracle | Admin resolution |
| Trading Model | CLOB | Forecast tournament (no money) |
| Collateral Token | USDC | None (Brier score) |
| Min Trade | $1 | N/A |
| Api Access | ✓ | ✗ |
| Embeddable Odds | ✓ | ✗ |
| Geo Restrictions | US persons blocked | None |
| Market Creation | Permissioned | Platform-set |
| Mobile App | ✗ | ✗ |
| Governance Token | ✗ | ✗ |
Polymarket Pricing
Polymarket
Free to trade
Free
- ✓USDC-denominated
- ✓Polygon network
- ✓Real-time CLOB
- ✓API access
- ✓Thousands of markets
Good Judgment Open Pricing
Good Judgment Open
Free to trade
Free
- ✓Forecasting tournament
- ✓Geopolitics/economics/science questions
- ✓Brier-score accuracy tracking
- ✓Superforecaster methodology
- ✓Free to participate
Verdict: Which Should You Choose?
Polymarket is the better pick if you need largest prediction market by volume — most accurate probabilities for major events. Good Judgment Open wins when backed by the research behind superforecasting. Both are production-ready — the right choice depends on your team's workflow and budget.