Quick answer
Sharp vs soft bookmakers: Sharp bookmakers run low margins, accept large stakes from professional bettors and move their prices quickly; soft (recreational) bookmakers run wider margins and often limit winning customers.
Also called: sharp books, soft books, recreational books
Explained, with an example
Odds-API.io builds its fair odds from a panel of sharp bookmakers “that consistently offer the tightest margins and accept high stakes”, then flags soft-book prices above that baseline as value [1]. Using sharp consensus as a proxy for true probability is common practice [2]. See Overround and Expected value.
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Frequently asked questions
What is the difference between sharp and soft bookmakers?
Sharp bookmakers run low margins, accept large stakes from professional bettors and move their prices quickly; soft (recreational) bookmakers run wider margins and often limit winning customers.
About this guide
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Author: Ken Lin · Corrections: if you spot an error, we review it and date-stamp the fix.
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Sources
- Value Bets guide (EV formula, response format, limitations) — Odds-API.io docs, accessed 2 Nov 2026
- What Is Value Betting? Definition & How to Find Value — Odds-API.io glossary, accessed 2 Nov 2026