What the curve is,
and why it bends.

The plate on our landing page is a sixth-plate daguerreotype from the eighteen-fifties. A young flag bearer in a tri-color sash holds a thirty-one-star American flag. Somebody tinted his cheeks with rouge under a magnifying lens. Somebody else sealed it under glass and brass, where it has held for the better part of two hundred years. We did not have to project anything about him; the plate is the projection.

An active baseball player is the harder case. He is mid-curve. He is twenty-six and we do not yet know what thirty-three will look like. He is thirty-five and we do not yet know whether the bat speed will return. The honest move is to draw the curve carefully, knowing where every curve like his has bent before.

The aging curve

Every career in the public WAR record traces a shape. The shape is not the same for hitters and pitchers, it is not the same for catchers and corner outfielders, and it is not the same for the era in which a player came up. But across every era and every cohort, the shape is recognizable: a steep ascent through the early twenties, a plateau, a gradual decline, and then a cliff somewhere past thirty-five that almost no career escapes.

We fit that shape on the public record and we apply it honestly. A 28-year-old in a peak window gets one curve. A 36-year-old veteran with a great year last season gets another, with a much steeper decline.

Why it bends toward recency

Lifetime résumé is a trap. A 43-year-old with sixty career WAR — most of it earned in two thousand and eleven — is not a top-ten active player today, even though a naïve rate-of-rate calculation would put him there. We weight the last three seasons heavily against the lifetime line. The model demotes fading legends and promotes the players who are actually performing now. We do this in plain code, with a single weight, and we publish the equation on the methodology page.

What the cardboard market has always been trying to price

When you buy a card, you are buying a position on a curve. You are betting on where the curve goes from here. The card market figured this out without the math — a 1st Bowman Chrome Auto of a 22-year-old phenom commands a multiple over the same player's third-year flagship not because of the cardboard, but because of the curve the cardboard is implicitly priced against.

WarCurve does not invent that pricing. It articulates it. The model writes down what the market has been quietly computing for fifty years, then makes it auditable.

What we are not promising

We are not promising that the model is always right. We are promising that it shows its work. Every player page will expose the four signals — career WAR, peak three-year WAR, cultural pull, milestone proximity — and the aging curve applied to them. When the model disagrees with the room, the disagreement will be legible. When the room is right and the model is wrong, we will rebuild the model.

Continue with the methodology, or the rookie card hierarchy.

Filed for the pre-launch · July 4, 2026