Overview
Forecasting tournament community. GammaPredict lists this platform for research and comparison. Check local availability, platform terms, fees and settlement rules before using real funds.
Good Judgment Open screenshots
Three distinct public captures for Good Judgment Open. Access gates and market lists change — treat them as a snapshot, not a live book.
Good Judgment Open review
Good Judgment Open is a public forecasting community and tournament hub. GammaPredict keeps it as a flagship because it answers a different query than Polymarket: “how do I get better at assigning probabilities?” rather than “where do I buy Yes.”
It is play-research, not a cash venue. We do not invent a brokerage layer.
Pros
- Public forecasting tournaments with a serious scoring culture
- Good pairing with Metaculus for skill, not for cash tickets
- Account-based, no wallet required for the core loop
Cons
- Not a prediction-market exchange with an order book
- Not CFTC or UKGC
- Beginners may want Manifold’s simpler ticket first
- Do not treat tournament standing as a withdrawable balance
Interface
The Questions list is the product: search, Active status, challenge filters (midterms, sports, world elections) and a closing timestamp plus forecaster counts. There is no Yes/No cashier.
Expect question lists, forecast inputs, leaderboards and comments. The page hierarchy is tournament → question → your forecast. It will not look like Kalshi’s contract board.
Markets
Geopolitics, economy, science — questions written for resolution. The “market” is the crowd of forecasters, not an order book of shares.
Access, KYC and region
The FAQ (last updated 3 June 2024 on this capture) explains Brier, Median and Relative Brier scores — lower is better — and challenge leaderboards. Treat GJ Open as skill forecasting, not as a funded event-contract venue.
Create an account on the official site. Standard email verification. Not a bank KYC cash book.
- Register on the official Good Judgment Open site.
- Join a live tournament only after you read its rules.
- Forecast a handful of questions before you care about rank.
How to place a trade
Submit and update probabilities. There is no USDC ticket here.
- Read the question and the resolution source.
- Enter a probability you would defend in writing.
- Update when the evidence changes.
- Review scoring, not a withdrawal screen.
Fees, rails and funding
Core participation is typically free. Prize rules, if any, live on the official tournament page.
| Item | Role | Watch |
|---|---|---|
| Account | Forecasting | Free / official terms |
| Cash Yes/No shares | Not this product | See Kalshi or Polymarket |
- You usually do not deposit trading funds here.
- Ignore third-party pages that dress GJO up as a crypto casino.
Risks and limits
Overfitting leaderboards, ignoring base rates, and confusing this community with an exchange. Stay on the official domain.
Verdict
Use Good Judgment Open with Metaculus when the goal is forecasting skill. Use Manifold when you want a play-money market UI. Use Kalshi when you need US event contracts.
Strengths
- Useful event and category discovery
- Clear comparison fields for custody, access, and market structure
- Good candidate for deeper editorial review
Risks and checks
- Availability and rules can change by region
- Liquidity and settlement quality vary by market
- Users should verify platform terms before using real funds
Weighted from liquidity, market variety, region access, KYC friction, fees, UX and transparency.
Choose the next action for Good Judgment Open.
Visit the official site after checking eligibility, or compare alternatives on GammaPredict.
Rating breakdown
Best fit
- Politics, policy and election markets
- Forecasting communities and research questions
- Your region, payment method or tax situation is unclear
Verification checklist
- Confirm regional eligibility and platform terms before depositing funds.
- Read market wording, expiry time zone and resolution source before trading.
- Check liquidity, fees, withdrawal path and settlement history for the specific event.
Best alternatives
MetaculusForecasting questions and tournament hub
ManifoldPlay-money forecasting community
FutuurCrowd forecasting and prediction communityEditorial note
This review is research, not a personalised recommendation and not financial advice. GammaPredict cannot recover funds lost on a third-party venue. See who we are, how scores are built and how to contact us.