Sportsbook

Odds trading: how a bookmaker runs its line

Odds trading (odds compiling, linemaking) is preparing and managing a bookmaker's line: opening prices, the margin, moving the odds on money and news, limits and control of the potential loss on every outcome. Trading determines how much of the built-in margin the bookmaker actually keeps.

Yevhen SychovOctober 2026

How it works

  • Opening: a model built on data and statistics produces the fair price, and the trader adds the bookmaker margin and publishes the line.
  • Movement: odds move with news, line-ups, player money and market prices. Bets from players with positive CLV signal that the price is wrong.
  • Limits: per market, event and account. They are lower on niche leagues and in-play, and individual players get a personal factor, which is bet limiting.
  • Closing: at the start, pre-match betting closes, and the market goes in-play or waits for settlement.

Liability by outcome

Liability on an outcome = payouts on bets on that outcome minus all stakes in the marketFor example, on a tennis match €10,000 has been staked on the first player and €6,000 on the second, both at 1.90. If the first player wins: €19,000 is paid out against €16,000 in stakes, a loss of €3,000. If the second wins: €11,400 is paid out, a profit of €4,600.

The trader sees the imbalance and cuts the first player's price, for example to 1.80, and raises the second player's, so that money starts coming in on the other side. Sometimes the imbalance is left on purpose: if it is recreational players rather than professionals backing the first player, the price may be right, and the bookmaker takes on the risk.

Feed or in-house traders

Automated feedIn-house traders
Coveragethousands of events and in-playtop events and your own markets
Pricethe same as other feed clients getyour own margin and reaction to your own money
Weak spota data failure hits every market at oncespeed and human error
Costsfees to the data supplierthe team and the data

A common setup: prices come from the feed, while an in-house team runs limits, liability and player profiles.

Common mistakes

  • A feed with no risk control of your own. You can buy the price, but limits and player profiles remain the operator's job. Without them, professionals are the first to find a pricing error.
  • Watching hold instead of liability. Hold shows the past. Risk is visible before the start: a final where almost everyone backs one side can wipe out a month's profit.
  • A line that does not follow the market. A price that moves only on your own money lags behind, and arbitrage bettors take the difference.
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