Live cross-venue prices, a calibration-backed edge scanner, and the historical curves behind every number — so “the market thinks 30%” is something you can actually check, not just repeat.
Every other tool helps you place a bet. Priors tells you what the bet — and the bettor — is actually worth.
Every open Kalshi market, checked against its calibration bucket in real time. A small badge means we actually found a trustworthy mispricing — most markets won't have one, and that's the honest, common case.
Browse live markets →The same event, priced on Kalshi and Polymarket side by side. See where the two venues actually disagree, not just where headlines say they do.
Compare venues →When Kalshi prices something at 30¢, does it happen 30% of the time? The historical curve behind every edge we surface, by category, price, and horizon.
Explore the data →Bet $100 on final-hour weather longshots and history paid back about $5. Roughly 12× overpriced.
Buying both sides of a match costs ~101¢ per guaranteed 100¢ — a quarter of a sportsbook's cut.
“Sure thing” favorites priced at 95¢ the night before resolve just 90.7% of the time.
One game spawns forty correlated markets. Every other accuracy dashboard counts them as forty observations — so their error bars lie. We cluster by event and bootstrap over games. It’s the only calibration you can trust.
Priors started as a calibration engine, and that’s still the core of it: real numbers, checked against what actually happened, no spin. Where we’re headed — analytics and insight for prediction-market traders, and in time, a place to learn from people who know these markets well.