The equations
53 models. Every one written down.
Each card is one model that runs somewhere in the Arena: the equation, what it decides, how it is graded, and where to see it move. Hover a card and its picture plays.
Why this matters
Everyone else sells a number. We show the equation that made it.
A price from a black box is a rumour. A price from a written equation, fitted on results you can see, scored against the market every week and graded by how much evidence stands behind each factor, is a claim you can check. That is the whole product.