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Legal US Sportsbooks — Live Odds Compared

Every regulated US sportsbook, plus the two big CFTC-regulated event-contract exchanges (Kalshi and Polymarket), in one place. Live odds refresh continuously. Compare any pair of books or any book vs Kalshi / Polymarket below.

Regulated US Sportsbooks

Event-Contract Exchanges

KalshiExchange
All 50 states (CFTC-regulated event contracts)
Edge: CFTC-regulated event-contracts exchange — sports markets as event contracts, not 'bets'. No vig in the traditional sense; spread is bid/ask.
PolymarketExchange
Operates US after legal reentry mid-2025
Edge: Largest crypto-rails prediction market by volume. Sports verticals growing fast post-relaunch.

Head-to-Head Comparisons

Every pair of regulated US sportsbooks compared on live odds.

FAQ

Which legal US sportsbook has the best odds?
No single book leads on every market. On major-league game lines (MLB, NBA, NFL, NHL) DraftKings and FanDuel typically lead market depth; BetMGM and Caesars often lead promo-adjusted EV; Circa leads sharp-friendly limits in Nevada. SportsBookISH live-compares all of them on every event so you can pick per-bet rather than committing to one book.
How does Kalshi compare to traditional sportsbooks?
Kalshi is a CFTC-regulated event-contracts exchange — sports markets trade as YES/NO contracts at user-set prices, not at house-set vigged odds. On major-league moneylines Kalshi mid-prices typically beat the sportsbook no-vig fair line by 2-8 percentage points; the gap widens on futures and player props.
Is Polymarket legal in the US?
Polymarket relaunched US operations in mid-2025 as a CFTC-regulated event-contracts platform. Sports markets are growing fast. Liquidity is concentrated on major events; SportsBookISH overlays Polymarket pricing on every event where it's available.
Why do you only show 7 sportsbooks?
SportsBookISH only names regulated US sportsbooks operating under state gaming licenses. Offshore brands (Bovada, BetOnline, MyBookie, etc.) contribute to the consensus median anonymously as 'Other' but are never named — their use in the US is unregulated and we don't promote them.