Bet Better price movement dataset 2026: opening vs closing bookmaker prices for 6,882 settled markets across 11 sports

One row per outcome of a settled betting market: the average bookmaker price when the market opened and the average price just before the game started, for 6,882 settled markets across 11 sports (June to September 2026). Prices are averaged across every licensed bookmaker we track (3 or more per row); no individual bookmaker is identified. Columns include opening and closing average decimal price, the percent move, book counts, the closing probability with the bookmaker's cut removed, and hours tracked. Full column definitions and three suggested analyses are in the codebook file. Collected and published by Bet Better (betbetter.world). Related open data and the market calibration study: betbetter.world/studies/market-calibration and betbetter.world/api