Data sources
Every figure on this site traces to one of the rows below. Where a figure is not yet verified, this page says so rather than leaving you to assume it is.
| Source | What it supplies | State |
|---|---|---|
| PriceCharting | Per-grade prices, sale volumes and PSA populations for Charizard #4 | Fetched 1 Sep 2026 |
| Heritage Auctions | Auction lot records with permanent lot pages | Lot URLs verified |
| Fanatics Collect | Auction lot records, first-party prices | Lot URLs verified |
| Goldin | Auction lot records | Lot URLs verified; some prices behind sign-in and shown as "price at source" |
| metals.dev | London PM gold price, the unit every ounce figure divides by | Unverified. The current reference is a prototype constant; the backfill has not run. |
| Pyth Network | The live metals strip at the foot of the page — display only | Unverified. Never executed against the live service from this build. |
What is synthetic in this build
PROTOTYPE. Current per-grade prices, volumes and PSA populations are real (PriceCharting, fetched 2026-09-01); the sold-comps table is real auction records (Heritage, Fanatics Collect, Goldin, PriceCharting sold feed). The daily price HISTORY is synthetic — real daily history cannot exist yet and is accumulated, never backfilled — and is labelled on the chart. The gold reference price and the active-listings module are synthetic.
Corrections
Send the page link and the sale we missed or miscounted. Accepted corrections land in the methodology revision log with a date.