Data-driven posts on sportsbooks, Kalshi, and where the value actually lives. The Odds Gap scans every book every minute, around the clock. These are the patterns that show up.
ProphetX, the newest prediction exchange on The Odds Gap, charges no vig and a 2% commission only on winning bets. On a coin flip it nets about -102, the smallest cut of any venue we track, where a sportsbook charges -110. On matched lines it is already the clear second exchange, behind only Polymarket and well ahead of Kalshi.
Seven days of best-price data across FanDuel, DraftKings, Polymarket, and Kalshi. Polymarket led moneylines at 40.2%. DraftKings led spreads (65.0%) and totals (68.8%). FanDuel finished mid-pack, and Kalshi, after taker fees, finished last of the four. No book swept.
After applying Kalshi's per-contract taker fee, Kalshi posts the best moneyline price 34.8% of the time, the highest of any single book in a field of 17. On spreads (2.9%) and totals (13.8%), the fee mostly erases the edge. The structural advantage is a moneyline story, not a sweep.
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