Prediction Markets
Module 3 covered options: defined risk that depends on strike, time, and volatility. A prediction market contract pays a fixed amount if a specific event occurs and zero if it does not. The contract price is the implied probability. No liquidation, no funding rate, no vega to track: your maximum loss is the premium you paid to enter.
How prediction markets work.
A prediction market contract pays a fixed amount, typically one dollar, if a specific event occurs, and zero if it does not. The contract price at any moment is the market-implied probability of that event. A contract trading at sixty cents says the market believes there is a 60 percent chance the event happens. A contract at ten cents says the market considers it unlikely. The price is the probability.
This is fundamentally different from futures and options. A futures gain or loss depends on how far price moves. An options gain depends on how far price moves relative to your strike, plus time and volatility. A prediction market outcome is binary: the event happens or it does not, and the payoff is fixed. You collect the dollar or you collect nothing. The practical consequence: no liquidation risk, no funding rate, no vega. Your maximum loss on a long position is the premium you paid, full stop.
The edge comes from having a more accurate probability estimate than the current market consensus. Opportunities arise when the market is systematically biased: overweighting recent events, underweighting tail scenarios, or mispricing events correlated with other instruments.
Kalshi (CFTC-regulated) leans sports, historically 80%+ of its volume. Polymarket leans politics and crypto-price contracts, the category most relevant to this module. Source: Pew Research Center / The Block, 2026.
Prediction markets and implied volatility.
For contracts tied to crypto price levels, will BTC close above a specific price by a specific date, the implied probability is directly related to the implied volatility of the underlying, the same IV from Module 3’s Greeks. High IV means the market expects large moves in either direction. Wider expected price distributions mean higher probability for out-of-the-money price targets, so contracts on aggressive levels trade higher when IV is elevated. When IV is low and the market expects a quiet stretch, those same contracts reprice lower because the distribution of outcomes has narrowed.
Two practical implications. First, you can overpay for a prediction market view during a high-IV spike, the same way you can overpay for options premium in the same conditions. Second, your IV read from the options market informs your prediction market analysis. If options IV has just compressed sharply after a major event (the IV crush from Module 3), contracts for price-level events will be cheaper than before the event. That compression may reflect a genuine change in probability, or it may simply be the crush. Knowing which is part of the edge.
Expected value and position sizing.
Every trade has a calculable expected value. If you believe the true probability is 65 percent and the contract is priced at $0.40, your expected value per contract is: (0.65 × $0.60) minus (0.35 × $0.40) = $0.39 minus $0.14 = $0.25. You expect to make 25 cents per dollar of exposure if your estimate is correct.
Position sizing is straightforward because maximum loss is the premium paid. Decide the maximum dollar amount you are willing to lose, then divide by the contract price to get your contract count. A trader willing to risk $300 on a contract priced at $0.40 buys 750 contracts. Maximum loss: $300. Maximum gain: $450. The math is transparent before entry.
Prediction markets are not a replacement for futures or options, they are a complement. When you have a strong view on a specific event but do not want directional price risk or leverage to manage, a prediction market contract expresses that view cleanly with defined risk.
Before placing any prediction market trade.
Find a live event contract on a near-term macro or price event. Read the current contract price and note the implied probability it represents.
Before looking at the contract price, write down your own probability estimate for the event. Commit to it before comparing.
Compare your estimate to the market price. Under 10 percentage points apart, the edge is too thin. Over 15 to 20 points, you have a potential trade.
Calculate expected value per contract: (your probability × potential gain per contract) minus (1 minus your probability × premium paid).
Size the position at no more than 1 to 2 percent of total trading capital. Size for the maximum loss, the premium, not the potential gain.
Record your reasoning before you enter. After the event resolves, review whether your analysis, your probability estimate, or both were correct.
January 2024: the Bitcoin ETF approval arc.
Prediction markets trade probability, not price.
The contract price is the implied probability, and your edge is the gap between that and your independent estimate. No liquidation, no funding, no leverage to manage. Module 5 covers zero delta strategies: how to earn yield on your holdings without taking directional price risk.
Risk warning: prediction market contracts can lose their full premium if the event resolves against you. Probability estimation is difficult and the market consensus is frequently correct. Size positions for the loss you are underwriting, not the gain you are hoping for.
This content is produced by Harmonic for educational purposes. It is strategy education, not investment advice.
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