About CardGap
CardGap is a Pokemon TCG market-data terminal tracking 11,216 cards across four marketplaces with daily-updated prices, JP↔EN arbitrage ratios, PSA grading ROI estimates, and country-exclusive card coverage.
Methodology
- Data sources
- Pokemon TCG API (TCGPlayer USD), Mercari (JP retail), Yahoo Japan Auctions (JP secondary), Card Rush (JP buyout). 4-source aggregate when available; minimum 1 source per card.
- Cardgap median
- Median of the most recent 20 transactions per marketplace, ±3σ outlier filter applied, then median across marketplaces (USD ÷ FX for international sources).
- Cardgap Estimate
- Fair-value estimate with low / high confidence band derived from cross-source variance. Wider band ⇒ less consensus ⇒ lower confidence.
- Cardgap Trust Score
- A/B/C/D grade combining volume, volatility, and source agreement. Detects wash-trade and pump signals where a single source diverges sharply from the rest.
- Update cadence
- Every 24h for prices and surge ratios. Last update: 2026-05-02. PSA population: weekly. Sets/illustrators: as TCG database is updated.
Operator
CardGap is independently operated. The site has no partnership, sponsorship, or affiliation with The Pokemon Company, Nintendo, Creatures Inc., GAMEFREAK, TPCi, TCGPlayer, eBay, Mercari, or Yahoo Japan. All trademarks belong to their respective owners. Pricing data is collected from publicly visible marketplace listings and presented as-is for informational purposes only — not investment advice.
Contact
For data corrections, takedown requests, partnership inquiries, or press: support@cardgap.jp
Public dataset (CC-BY 4.0) · llms.txt · sitemap.xml
Affiliate disclosure
Outbound buy/sell links to Amazon Japan, Rakuten, eBay, TCGPlayer, Yuyutei, and Card Rush may contain affiliate parameters. CardGap may earn a commission when you purchase through these links — at no extra cost to you. This does not affect price data, ranking, or editorial positioning.