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Closing line value: the fastest honest test of a betting edge

Win rates take months to mean anything. CLV — whether the market moves toward you after you bet — converges on the truth in weeks. Momus captures it on every bet.

August 29, 2026 · 3 min read

A 60% win rate over twenty bets could be skill or a warm coin. The number sharps actually watch is closing line value: the difference between the price you got and the price at close. If the market keeps moving toward your side after you enter, you are consistently seeing something before the crowd does — and no run of luck can fake that on volume.

How Momus uses it

Every live MLB bet's closing line is captured near first pitch; the tennis vertical has logged entry-versus-close on every paper bet since it launched. CLV per bet, average CLV and beat-the-close rate are queryable through the Intelligence API — and the MLB engine's right to stay live is contractual: positive CLV after twenty settled bets, or back to the lab.

Results tell you what happened. CLV tells you whether it should keep happening. A record that publishes both is one you can actually evaluate.