Coming soon — 2026 season
OnBase plays every MLB game out before it happens, pitch by pitch, in the real weather and ballpark of each field. Then it shows where its number and the book's disagree. The scorecard's public, wins and losses both.
How the engine works. Not a promise about results.
What's inside
Built like a trading desk
Fair probabilities, the reasoning behind them, and a public ledger that keeps the count honest.
The Edge Board
Every market on the slate, our fair probability next to the book's price. Sorted by edge. The number is right there; the reasoning is one click in.
- Fair price vs. book
- Closing-line value
- Confidence on each call
Calibrated, and checkable
When OnBase says 62%, it lands near 62% over time, and we post the math. Brier score, calibration error, and CLV on every graded call, updated as results come in.
- Public accuracy ledger
- Losses stay up
- Graded on CLV
Ballparks, modeled for real
Ball flight runs through tonight's air, with temperature, humidity, altitude, and wind resolved at each field. Coors in dry air behaves differently, so we price it differently.
- Per-batter park factors
- Wind by field
- Physics, not flat multipliers
Get on the board early
People on the early list get in before the public launch.