A prediction market is a platform where participants buy and sell contracts that resolve based on real-world events. Contracts trade between $0 and $1 — the price represents the market's implied probability of the event occurring. If you buy a YES contract at $0.40 and the event happens, you receive $1.00 (a 150% return). If it does not happen, you lose your $0.40. Prediction markets cover politics, economics, geopolitics, technology, and culture.
How Prediction Markets Work
A prediction market creates a tradeable contract for a specific question with a definitive outcome. The question must be binary (yes or no) and have a clear resolution date and criteria.
Example: "Will the Federal Reserve cut interest rates at the June 2026 meeting?"
- A YES contract resolves to $1.00 if the Fed cuts rates. A NO contract resolves to $1.00 if they do not.
- YES and NO prices always sum to approximately $1.00 (minus the platform's spread or fee).
- If the YES contract trades at $0.65, the market implies a 65% probability of a rate cut.
- You can buy YES at $0.65 (risking $0.65 to profit $0.35) or buy NO at $0.35 (risking $0.35 to profit $0.65).
The critical feature is that you can trade in and out before resolution. If you buy YES at $0.40 and new economic data shifts sentiment, the price might rise to $0.75. You can sell at $0.75 for a $0.35 profit (87.5% return) without waiting for the event to occur. This makes prediction markets closer to financial trading than gambling.
Contract Prices as Probabilities
The price of a prediction market contract is a direct expression of the market's collective probability estimate. This is what makes prediction markets valuable as both trading instruments and forecasting tools.
A $0.80 YES contract means the market believes there is an 80% chance the event will happen. If you believe the true probability is 90%, the contract is underpriced — buying YES at $0.80 has positive expected value. If you believe the probability is only 60%, the contract is overpriced — buying NO (at $0.20) has positive expected value.
The implied probability calculator converts between contract prices, probabilities, and potential returns for any prediction market position.
Key insight: Profit in prediction markets comes from the gap between the market's implied probability and the true probability. This is identical to the concept of "edge" in traditional trading — the difference between what the market thinks and what is actually true.
Major Prediction Market Platforms
| Platform | Type | Markets | Regulation | US Access |
|---|---|---|---|---|
| Polymarket | Blockchain (Polygon) | Politics, crypto, economics, culture | Self-regulated | Restricted |
| Kalshi | Centralised exchange | Economics, weather, politics, finance | CFTC-regulated | Yes |
| CME Group | Futures exchange | Fed funds, economic events | CFTC-regulated | Yes |
| Robinhood | Brokerage-integrated | Selected event contracts | SEC/FINRA-regulated | Yes |
Polymarket is the largest prediction market by volume and market coverage. It runs on the Polygon blockchain, enabling transparent order books and settlement. Polymarket offers the widest range of markets — from US presidential elections to whether specific tech milestones will be reached. However, it is restricted for US-based users due to regulatory constraints.
Kalshi is the first CFTC-regulated prediction market exchange in the US. It offers event contracts on economics (will GDP exceed X%), weather, politics, and finance. US residents can trade legally on Kalshi with the protection of federal regulation.
CME Group offers event contracts through its established futures infrastructure. Fed funds futures have functioned as implicit prediction markets for decades, pricing the probability of rate decisions. CME is expanding its event contract offerings.
For a deeper comparison of these platforms, see the event contract trading guide.
Types of Prediction Markets
Prediction markets cover virtually any question with a definitive, verifiable outcome.
Political Markets
Election outcomes, policy decisions, geopolitical events. These are the highest-volume prediction markets. Presidential election markets on Polymarket have generated billions in trading volume. Political markets are particularly valuable because polling data is often incomplete or biased, creating opportunities for informed traders to profit from mispriced contracts.
Economic Markets
Interest rate decisions, inflation readings, GDP growth, employment data. Economic prediction markets directly complement traditional financial trading. If you believe the Fed will cut rates (buying YES on a rate cut contract), you might simultaneously go long on bonds or growth stocks. The prediction market position hedges or amplifies your traditional portfolio exposure.
Geopolitical Markets
Conflict outcomes, treaty resolutions, sanctions. These markets price events that are difficult to analyse through traditional financial models, creating opportunities for traders with domain expertise.
Technology and Culture Markets
Product launches, regulatory rulings, AI milestones, entertainment outcomes. These niche markets are often less efficient (fewer participants, less sophisticated analysis), which creates larger mispricings for informed traders to exploit.
Prediction Markets vs Sports Betting
Prediction markets and sports betting both involve wagering on outcomes, but they differ in three critical ways.
1. Continuous trading. Prediction market contracts can be bought and sold at any time before resolution. You can exit a position at a profit or loss without waiting for the outcome. Sports bets are fixed once placed — you cannot sell your bet to someone else.
2. Price discovery. Prediction market prices continuously update based on buy and sell pressure from all participants. This makes them real-time probability estimators. Sports odds are set by bookmakers with a built-in margin (the overround), not by open market forces.
3. Scope. Sports betting covers athletics. Prediction markets cover everything — politics, economics, technology, culture, science. The analytical skills required are domain expertise and probability assessment, not sports knowledge.
Prediction Markets vs Options
Prediction market contracts share structural similarities with binary options. Both have a binary outcome (above/below a price for options, yes/no for prediction markets), both trade between $0 and $1, and both resolve on a specific date.
The key differences: prediction market contracts resolve on real-world events, not price levels. They do not require underlying asset exposure. And the analytical framework is probability estimation rather than volatility pricing. For traders who understand options, prediction markets offer a familiar instrument structure applied to an entirely different set of events.
How to Get Started
If you are new to prediction markets, start with these steps:
- Choose a platform. US residents: Kalshi (regulated) or Robinhood event contracts. International: Polymarket (largest selection).
- Start with familiar topics. Trade markets where you have domain knowledge — economic data if you follow macro, technology if you work in tech, politics if you follow campaigns closely.
- Size positions small. Start with $5-25 per contract. The goal is to learn the mechanics and develop your probability estimation skills without significant risk.
- Track your calibration. Record your probability estimates versus market prices. Over time, you will discover which domains you are well-calibrated in (your estimates match reality) and which you are overconfident or underconfident in.
- Use the tools. The Polymarket calculator and implied probability calculator help you convert between prices, probabilities, and expected values before every trade.
Vector Ridge Polymarket Signals
Vector Ridge includes Polymarket prediction market signals as one of its 6 market categories. These signals identify mispriced contracts using the same Grade A-E conviction system applied to all other markets.
Each Polymarket signal includes the contract, direction (YES or NO), entry price, target exit price, and conviction grade. Signals are updated biweekly as prediction market conditions evolve. The Polymarket signals page displays all current open positions with real-time pricing.
For strategy frameworks specific to prediction markets, see the Polymarket strategy guide.
- 1.Prediction market contracts trade between $0 and $1, where the price equals the implied probability. A $0.70 YES contract means the market assigns a 70% chance the event occurs.
- 2.Profit comes from the gap between market price and true probability. If you believe an event has an 85% chance but the contract trades at $0.65, buying YES has positive expected value.
- 3.Unlike fixed bets, prediction market contracts can be traded continuously before resolution. You can exit at a profit without waiting for the outcome.
- 4.Major platforms include Polymarket (largest, blockchain-based, international), Kalshi (CFTC-regulated, US), CME Group (futures-based), and Robinhood (brokerage-integrated).
- 5.Prediction markets cover politics, economics, geopolitics, technology, and culture. The analytical edge comes from domain expertise and probability calibration.
- 6.Some signal providers offer Polymarket signals alongside traditional markets, grading conviction levels to help traders assess confidence in each position.
Prediction markets and sports betting both involve wagering on outcomes, but they differ in three key ways. First, prediction markets trade continuous contracts that you can buy and sell at any time before resolution, while sports bets are fixed once placed. Second, prediction market pricing reflects real-time probability estimates from all participants, making them useful forecasting tools. Third, prediction markets cover a much broader range of events — politics, economics, geopolitics, technology milestones, and culture — not just sports. The ability to trade in and out before resolution is the most important distinction.
Legality depends on your jurisdiction and the specific platform. In the US, Kalshi is regulated by the CFTC as a designated contract market and is legal for US residents. Polymarket operates on blockchain and is available internationally but restricted for US users. The CME Group offers event contracts on regulated futures markets. In the EU and UK, prediction markets exist in regulatory grey areas. Always check your local regulations before trading. The regulatory landscape is evolving rapidly as prediction markets gain mainstream adoption.
The price of a prediction market contract directly represents the market's implied probability of that event occurring. A YES contract trading at $0.70 implies a 70% probability. A YES contract at $0.15 implies a 15% probability. If you believe the true probability is higher than the market price, you buy YES (the market is underpricing the event). If you believe it is lower, you buy NO or sell YES. The implied probability calculator at vector-ridge.com converts between contract prices and probabilities for quick analysis.