What Are Prediction Markets?
Prediction markets are exchanges where you trade contracts on future events. Instead of betting against a bookmaker, you trade with other participants. Prices reflect the crowd's probability estimate.
A contract trading at 65¢ implies a 65% probability of that outcome occurring. If you think the true probability is 80%, you have edge — buy at 65¢, potentially collect $1.00.
💡 Why Prediction Markets Matter
Prediction markets have historically outperformed polls, pundits, and models in forecasting elections and events. They aggregate information from people willing to put money behind their beliefs. Real money = real accountability.
How It Works
Example: Presidential Election Market
Market: "Will Candidate A win the 2028 Presidential Election?"
If you buy YES at 52¢:
- Candidate A wins → You receive $1.00 (profit: 48¢ per contract)
- Candidate A loses → You receive $0 (loss: 52¢ per contract)
Implied probability: 52% chance of winning based on market price.
Key Concepts
- Binary contracts: Resolve to $1 (YES) or $0 (NO). Most common type.
- Price = Probability: 70¢ price ≈ 70% implied probability.
- You can sell anytime: Don't need to hold to resolution. Trade the movement.
- Liquidity matters: High-volume markets have tighter spreads and better prices.
- Resolution rules: Read carefully. "Will X happen by Y date?" — specifics matter.
Major Platforms
Polymarket Crypto
The largest prediction market by volume. Crypto-native (USDC on Polygon). Global access, deep liquidity on major events.
- No KYC for most users
- Highest liquidity on politics/crypto
- Mobile app available
- US users technically restricted
Kalshi CFTC Regulated
US-regulated prediction market. Legal for Americans. Lower limits but growing. Focus on economics and events.
- Fully legal in US (CFTC-regulated)
- Real USD deposits
- Election markets now available
- Position limits on some markets
PredictIt CFTC No-Action
Academic/research platform. US-accessible but with strict limits ($850/market). Popular for political junkies.
- $850 max per market
- 10% fee on profits
- 5% withdrawal fee
- Being wound down (check status)
Betfair Exchange Exchange
World's largest betting exchange. Not US-accessible. Deep liquidity on UK/EU politics and global events.
- Massive liquidity
- ~2-5% commission on wins
- Not available in US
- Sports + politics + specials
Market Categories
Elections
Presidential, Congressional, Governor, International
Politics
Policy, legislation, appointments, impeachment
Economics
Fed rates, inflation, GDP, unemployment
World Events
Geopolitics, conflicts, treaties, summits
Entertainment
Oscars, Grammys, TV shows, celebrity news
Science & Tech
AI milestones, space launches, FDA approvals
Election Betting Strategy
1. Understand What Moves Markets
- Polls: New polls shift prices, but markets often front-run polling averages.
- Endorsements: Major endorsements can move markets 1-3 points.
- Debates: Prices swing during and after debates. High volatility = opportunity.
- October surprises: Unexpected news in final weeks creates massive swings.
- Early voting data: Turnout patterns signal which side is energized.
2. Finding Edge
- Local knowledge: National markets miss regional dynamics. If you understand Ohio politics better than the average trader, you have edge.
- Model vs market: Run your own probability model (538-style). When it diverges from market, investigate why.
- Recency bias: Markets overreact to recent news. A bad poll isn't the end — fade overreactions.
- Correlation plays: If Candidate A wins, certain down-ballot races become more likely. Find mispricings.
💡 The Closing Line
Just like sports betting, the final price before an event is usually the most accurate. If you consistently buy at prices that move in your direction by close, you're finding edge.
Economic & Fed Markets
📊 Fed Rate Decisions
Will the Fed raise, cut, or hold rates? Markets price FOMC decisions. Compare to CME FedWatch tool.
📈 Inflation (CPI)
Will CPI come in above/below X%? Monthly releases create trading opportunities. Economists' consensus is priced in.
💼 Unemployment
Will unemployment stay below X%? Monthly jobs report markets. Extremely hard to predict — high variance.
📉 Recession
Will there be a recession by [date]? Longer-term macro markets. Definition matters — read rules carefully.
Trading Strategies
1. Event-Driven Trading
- Pre-event positioning: Buy before debates, speeches, or data releases when you have a view.
- Volatility plays: Prices swing wildly during live events. If you're watching and others aren't, react faster.
- Fade the overreaction: Markets overreact to dramatic moments. Buy the dip (or sell the spike).
2. Arbitrage & Hedging
- Cross-platform arb: Same market priced differently on Polymarket vs Kalshi? Free money (minus fees).
- Correlated markets: "Party X wins Presidency" and "Party X wins Senate" are correlated. Mispricings exist.
- Hedge positions: Long one candidate, short another in separate markets if correlation is off.
3. Long-Term Holds
- Early positioning: Markets are less efficient far from resolution. Get in early with conviction.
- Time decay: Prices converge toward 0 or 100 as resolution approaches. No theta like options, but similar effect.
- Capital efficiency: Holding 60¢ contracts for 6 months ties up capital. Factor in opportunity cost.
Common Mistakes
❌ Confusing Price with Value
A contract at 80¢ isn't "expensive" if true probability is 95%. A contract at 20¢ isn't "cheap" if true probability is 5%. Price is probability, not value. Value is when price ≠ true probability.
❌ Ignoring Resolution Rules
"Will X happen?" markets have specific criteria. "Recession" might be defined as two consecutive quarters of negative GDP, not the NBER declaration. Read the fine print.
❌ Overconfidence in Your Political Views
Everyone thinks they understand politics better than the market. Most are wrong. The market aggregates information from millions of participants. You need a specific, defensible edge — not just opinions.
❌ Ignoring Fees
PredictIt takes 10% of profits + 5% withdrawal. Polymarket has gas fees. These add up. A 55% edge market becomes breakeven after fees. Do the math.
Resources
📊 Polling Aggregators
538, RealClearPolitics, The Economist, Silver Bulletin. Compare polling averages to market prices.
🗺️ Electoral Maps
270toWin, Electoral-Vote.com. Model different scenarios and compare to market-implied probabilities.
📈 Economic Data
FRED, BLS, CME FedWatch. Primary sources for economic indicators that move markets.
💬 Prediction Market Twitter
@Polymarket, @Kalaboratory, @StarSpangledGmbr. Community discussion often surfaces edge.
Getting Started
Your First Steps
- Start small: Deposit $50-100. Learn the interface. Make some trades.
- Pick one category: Politics, economics, or entertainment. Go deep before going wide.
- Track your bets: Record entry price, reasoning, and outcome. Review what works.
- Compare to polls/models: When your view differs from consensus, write down why. See who's right.
- Manage position size: No single market should be >10% of your bankroll. Diversify.