Prediction markets let you buy and sell contracts that pay out based on whether an event happens. For bettors, they’re increasingly a second place to price sports outcomes — and sometimes a sharper one. Here’s the plain-English version.
Table of Contents
How a prediction market works
A contract settles at $1 if the event happens and $0 if it doesn’t. If “Team A wins the division” trades at 42¢, the market is implying roughly a 42% chance. You can buy for 42¢ and collect $1 if it hits, or sell if you think it’s overpriced. The price is the probability.
Kalshi vs. Polymarket
- Kalshi is a US, federally regulated exchange (CFTC-overseen) offering event contracts, including a growing set of sports markets.
- Polymarket is a crypto-based prediction market with deep liquidity on many events.
- Both quote prices in cents that map directly to implied probability.
Why compare them to sportsbook odds
A sportsbook moneyline and a prediction-market price are two estimates of the same probability. When they disagree, that gap is information. If a book implies 39% and the market trades at 42¢, one of them is off — and the difference is where an edge can live.
How to read the two side by side
- Convert the sportsbook line to an implied probability.
- Compare it to the market price in cents (42¢ = 42%).
- A persistent gap, not a one-tick blip, is the signal worth acting on.
BetSlate puts prediction-market prices next to book-implied odds on the same card, so those gaps are visible at a glance instead of buried across two apps.
