In American sportsbook parlance, a "sharp" is a professional bettor whose action causes bookmakers to adjust their lines. A "square" is a recreational bettor whose action reflects public sentiment rather than information. Both exist in prediction markets, and understanding which type of money is moving a price is one of the most valuable skills a prediction market trader can develop.
How Sharp Money Moves Markets
Sharp money typically moves early and specifically. A major prediction market on a sporting event might open at 55¢ for the favourite. Within hours, informed traders who have processed team news, injury reports, weather forecasts, or statistical models will bid the price to 62¢ or sell it down to 48¢. This movement is sharp money. It reflects information, not popularity.
How to Read the Movement
- →Early, significant, counter-intuitive movement = usually sharp (information-based)
- →Late, large, intuitive movement = usually square (public money following headlines)
- →When the market moves against the public's obvious team, the movement is most meaningful
- →Small sustained drift over days = slowly incorporating information; spike = breaking news
Boromarket's transparent price history lets you see exactly when and how fast a market moved. A market that drifted from 60¢ to 45¢ in two hours on a Sunday morning — before any public news broke — tells you something sharp happened. Investigate what before dismissing the move.
You do not need to be a sharp bettor to benefit from sharp money. You need to be able to identify when sharp money is moving a market and whether you agree with the implied assessment. Sometimes the wisest trade is simply to follow where the informed money has already gone.