- The S&Poké 500 uses TCGplayer Market Price, a smoothed average of Near Mint raw/ungraded sales, captured daily.
- Cards without recent sales data carry forward the last-known price for up to 70 days to avoid showing a false $0.
- Anomalous prices from thin trading are held at the recent median until confirmed by later data.
- Daily changes are shown only for cards with confirmed prices on both days; otherwise, a dash is displayed.
- Other sites show different prices because they measure different markets (e.g., PriceCharting averages eBay sold listings, eBay search results are mostly asking prices, graded cards are a different market).
- Weekly market updates are available via email.