1. FantasyPoly
Play money · freeBest for: Learning prediction markets risk-free on live Polymarket odds
Our own platform, so judge accordingly: FantasyPoly mirrors live Polymarket odds and lets you trade them with a virtual bankroll. You get real market dynamics - spreads, moving probabilities, resolution dates - without deposits or risk. Leaderboards, seasons, daily challenges, and an open API for AI agents turn practice into a public forecasting track record.
2. Kalshi
Real money · regulated exchangeBest for: US traders who want a federally regulated venue
Kalshi is a CFTC-regulated event-contract exchange based in the US. It offers real-money markets on politics, economics, weather, and culture with dollar-denominated contracts. Regulation brings legitimacy and USD on/off ramps, at the cost of a more limited market universe than crypto-native platforms in some categories.
3. Manifold
Play money · community marketsBest for: Creating your own questions and betting with a community
Manifold lets anyone create a market on anything, traded with its play-money currency 'mana'. The user-generated approach means enormous breadth and a fun community, but market quality and resolution reliability vary since question creators resolve their own markets.
4. Metaculus
Forecasting platform · no tradingBest for: Serious forecasters who care about calibration, not markets
Metaculus is not a market: you submit probability forecasts and are scored on accuracy over time. It attracts a rigorous forecasting community and produces well-calibrated aggregate predictions on science, technology, and geopolitics. Choose it if you want to improve as a forecaster rather than trade.
5. PredictIt
Real money · political marketsBest for: Small-stakes US political betting with a long track record
PredictIt is the veteran US political prediction market, operating under academic no-action relief with position and contribution limits. The market selection is narrower and fees are comparatively high, but its political markets have a long research pedigree.
6. Good Judgment Open
Forecasting tournaments · freeBest for: Testing yourself against Superforecaster-style questions
Good Judgment Open runs public forecasting tournaments descended from the research behind 'Superforecasting'. Like Metaculus, there is no trading - you log probability estimates and build a Brier-score track record on geopolitical and economic questions.
7. FundedPoly
Prop firm · winding downBest for: Historical mention - no longer accepting new customers
FundedPoly offered paid evaluations that funded successful Polymarket-style traders with simulated capital and a profit split. As of July 2026, its website states it is winding down and no longer accepts new sign-ups, which is why practice platforms are the natural next stop.