Data standards
Pricing Methodology
TrendHQ is a market-reference and catalog platform, not a formal appraisal service. This page explains what the numbers include, what they exclude, and how incomplete coverage is presented.
Methodology last reviewed
Source coverage by game
| Game | Primary source | Active coverage |
|---|---|---|
| Magic: The Gathering | Scryfall | Catalog and available marketplace price fields |
| Pokémon TCG | Pokémon TCG API | Catalog and available marketplace price fields |
| Yu-Gi-Oh! | YGOProDeck | Catalog and available TCG market data |
| Disney Lorcana | Lorcana API | Catalog and embedded prices when available |
| Flesh and Blood | the-fab-cube | Catalog only; the active source has no current prices |
| One Piece | APITCG | Catalog and embedded prices when available |
| Digimon | DigimonCard.io | Catalog and embedded prices when available |
Refresh cadence and timestamps
The ingestion pipeline is scheduled approximately daily. Upstream outages, rate limits, or slow database operations can delay an individual source. Pages therefore display the timestamp of the data snapshot they actually use rather than promising that every game updated at the same moment.
Current price and missing values
Rankings use positive USD market prices stored for an exact card printing. A missing price is excluded from averages, totals, and mover comparisons. It is not converted to $0. Set pages report both the catalog count and priced-card count so readers can judge coverage before using a total.
Market movers
A card qualifies only when TrendHQ has a positive current price and a positive baseline price near the start of the requested window. Change is calculated in both dollars and percentage. Large moves on low-priced or thinly traded cards should be manually checked against recent completed sales.
Raw cards, grading, and auctions
TrendHQ’s market pages describe raw-card price references. They do not appraise condition, assign a professional grade, calculate a population premium, or merge exceptional auction and private sale records into ordinary card rankings.
Corrections and questions
Card identity, source attribution, or methodology concerns can be sent to [email protected]. Include the card or set URL and the specific field that appears incorrect.