EXPERIMENTAL PROTOTYPE · NOT FOR USE
This page is an unvalidated research prototype. Outputs are model projections, not betting advice, and have not been backtested or independently audited. No warranty, express or implied. Past performance does not predict future results. Sports betting carries financial risk; only those 21+ in jurisdictions where it is legal should consider wagering. For information on responsible play, see our responsible gambling page or call 1-800-GAMBLER. By viewing this page you acknowledge it is provided for evaluation and educational purposes only.

Prediction markets vs books

For every game that’s live on both Kalshi/Polymarket anda US sportsbook, we compare the vig-free prediction-market probability against the book’s devigged implied probability. If the numbers disagree, one side is mispriced — and that’s where the bet is.

Comparing markets…