Prediction markets vs sports betting
Prediction markets are peer-to-peer exchanges priced by supply and demand. Sportsbooks set lines and bake in a margin (the vig). For the same outcome, the implied probabilities are often slightly different — and sometimes the prediction market is meaningfully cheaper.
How odds compare to event contracts
American odds of −110 imply 52.4% probability; +200 implies 33.3%. A prediction market contract at 50¢ implies 50%. The calculator converts both into common units so you can compare apples to apples.
Which offers better value?
Frequently the prediction market wins on liquid, high-profile events where the sportsbook has padded its margin. On smaller markets the sportsbook may have tighter liquidity. Always check both before committing.
Real examples
A presidential winner contract on Kalshi at 56¢ implies 56% probability. A regulated sportsbook offering −150 on the same outcome implies 60%. On a $100 stake the prediction market pays $178; the sportsbook pays $167. The prediction market is the better value.
Questions
Frequently asked questions
Are prediction markets better than sportsbooks?+
Sometimes — particularly on high-profile, liquid events where prediction markets are tighter than the sportsbook's built-in margin. Always compare.
Can I arbitrage between them?+
In theory, yes. In practice you must factor in fees, slippage, withdrawal times and legal restrictions in your state.
What's the vig?+
The implicit margin a sportsbook builds into its odds. Prediction markets charge explicit fees instead, which are usually visible and smaller.