Where the books disagree, worked out.

The arbitrage board compares the best price for every outcome of a market across bookmakers. When they disagree enough, it shows how to split a stake across them, and every risk that can undo it.

See pricing

Free plan: five assessments a month, no card needed. A positive edge is an estimate, not a promise. 18+, bet lawfully where you are.

  • Arithmetic, not a forecastA cover is decided by the prices before the match starts.
  • Your bookmakers firstFilter to the accounts you hold, or see which ones unlock more.
  • Checked when openedPrices are checked again when you open one, then every 90 seconds.
  • Risks namedAccount limits, moving prices and settlement rules, on every card.

Three kinds of opportunity

Every opportunity on the board names the bookmakers it needs, how the stake splits across them and what it returns, with the working leg by leg.

  • Sure betsThe best prices on every outcome imply less than one in total, so backing all of them returns the same whichever way it lands. Labelled full cover only when it survives rounding stakes to real cents.
  • MiddlesTwo lines far enough apart that both bets can win. The card shows the loss when only one does.
  • Low marginMarkets where the combined margin is unusually thin. Backing every outcome still loses that margin, and the card says so.

BAI8 never places a bet. Bookmakers can limit an account that takes these prices, and a price can move before every leg is placed.