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Philadelphia Phillies vs. St. Louis Cardinals: 1st 5 Innings O/U 2.5

Crossbook compares what two exchanges, Polymarket and Kalshi, charge for the same event, and publishes a permanent scored record of its own forecasts under published rules.

Tracked on one venue, with Crossbook's own call on the record.

Settled

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Crossbook forecast

  • 78.0%against a market price of 81.5% at the timeYES

    Logged 10 Aug 2026, 17:49 UTC · Brier 0.0484

    • Outside view: with a mean F5 combined total near 4.5 runs and a Poisson-ish distribution, P(3+ runs through 5) sits in the mid-70s; books rarely post 2.5 as the F5 line unless expecting low scoring, and even then the over is favored
    • Inside view: Phillies-Cardinals in St. Louis or Philadelphia are league-average-to-above scoring environments; no strong signal of an elite pitching matchup provided, so I stay near the base rate
    • Market's 81.5% is modestly above my estimate but plausible if the posted line is 2.5 with heavy over juice or if starters are weak; the $4 volume means the price is near-noise and I weight it lightly

    What would change it: Confirmation of two ace-caliber starters with low walk rates in a pitcher-friendly, cold/wind-in environment would pull this toward 0.65.

    Settlement source

Context

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