You need an edge
Random bets lose to fees over time. The only way to win is to have a probability estimate that's better than the market's — and to bet only when the gap is large enough to cover costs.
Guide · Intermediate
How to Actually Make Money on Prediction Markets
Edge, bankroll, process. The unglamorous habits that separate winning traders from gamblers.
Can you really make money on prediction markets?
Yes, but only with a repeatable edge — a probability estimate that beats the market by more than fees and spread. Casual bettors typically lose to those costs over time.
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TL;DR
You only make money long-run when your probability estimate beats the market by more than the fees and spread cost. That means: pick markets you have domain edge in, size positions with fractional Kelly (half or quarter), and log every trade. Discipline compounds; hot takes don't.
Where edges come from
Domain expertise. Faster information. Better models. Behavioral mispricings (the crowd loves favorites and overreacts to headlines).
- Read the resolution criteria like a contract lawyer
- Build a simple spreadsheet model before you trade
- Track every position — wins and losses
Bankroll management
The Kelly criterion suggests sizing positions in proportion to your edge. Most pros use half-Kelly or quarter-Kelly to survive variance. Never risk more than 5% of bankroll on a single binary bet — even if you're sure.
The market can stay irrational longer than you can stay solvent.
Process beats prediction
Winning traders log every trade, review monthly, and kill strategies that don't compound. Discipline, not genius, is the moat.
Frequently asked questions
Can you really make money on prediction markets?
Yes, but only with a repeatable edge — a probability estimate that beats the market by more than fees and spread. Casual bettors typically lose to those costs over time.
What's the Kelly criterion?
A formula that sizes each bet proportional to your edge and odds. Most pros use half or quarter Kelly to reduce variance without giving up much long-run growth.
How much bankroll do I need?
Enough that you can risk 1–2% per trade and still see meaningful dollar outcomes. Most serious traders start with $500–$2,000.
Is arbitrage possible between Kalshi and Polymarket?
Occasionally, especially on politics markets with different resolution wording. The edge is usually eaten by fees, spreads, and the USD/USDC conversion, so it's not a reliable strategy for retail.
Sources & references
About the author
Catie Di Stefano
Editor-in-Chief, PredictionWins · 15+ yrs experience
Catie has spent 15 years covering iGaming, sports betting, and now prediction markets — first as a trade reporter, later as head of editorial at two major industry publications. She has tested every regulated US event exchange since Kalshi's 2021 launch and writes the bulk of PredictionWins' platform reviews and tax explainers.
Reviewed against our editorial policy.
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