What is closing line value?
A plain-English guide to CLV — what closing line value means, why sharp bettors trust it more than win rate, how it's measured, and the honest read on Signal Labs' own (roughly flat) closing line value.
Closing line value (CLV) measures whether the price you got on a bet was better than the price the market settled at when the game started. If a model consistently gets better-than-closing prices, it is finding value the market only recognizes later — and over a large sample, beating the closing line is the single strongest indicator that a bettor or model has a genuine, repeatable edge, because it cannot be faked by a lucky hot streak.
Signal Labs measures CLV on every pick as no-vig opening price versus no-vig closing price, expressed in percentage points (pp). A positive number means the model, on average, beat the closing market; zero means it matched it; negative means it lagged.
Win rate over a few hundred picks is noisy — you can win 58% for two months on pure variance. CLV is different: to beat the closing line repeatedly, you have to be systematically pricing games better than the sharpest market in sports. That is why serious bettors treat long-run CLV, not short-run record, as the real scoreboard.
Signal Labs' measured closing line value is currently +0.39pp across 193 measured picks — essentially flat, within the range luck alone can produce. That means we do not claim a proven, durable edge over the closing market, even though the raw win rate (56.5%) has been above break-even. We publish this number instead of hiding it, alongside the full record on the public ledger, because an honest flat CLV is worth more than a dishonest edge claim.
What is CLV (closing line value)?Closing line value is the difference between the price you got on a bet and the price the market closed at before the game started. Measured as no-vig open versus no-vig close, a positive CLV means you beat the closing market. Over a large sample it is the strongest single indicator of a real, repeatable edge because it cannot be produced by a lucky streak.
Why is CLV better than win rate for judging a model?Win rate over a few hundred picks is noisy and can look strong from variance alone. Beating the closing line repeatedly requires systematically pricing games better than the sharpest market, so long-run CLV is a far more reliable signal of genuine skill than a short-run record.
What is Signal Labs' closing line value?Signal Labs measures CLV on every pick and its result runs roughly flat — essentially even with the closing market, within the range luck can produce. Signal Labs publishes this openly rather than claiming a proven edge, and shows the live number on its public track-record page.