Research
Guides & research.
Plain-English explainers on how card prices work, what grades mean for value, and how we turn real trades into a reference price you can verify.
How a card reference price is calculated
A reference price is only as good as the trades behind it. Here is exactly how ours is built — and how to read it.
Updated 2026-06-12
What card grades mean for value (PSA, BGS, CGC)
Grade is the biggest lever on a card’s price. Here’s how the major scales work and why a single point can multiply value.
Updated 2026-06-12