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 | Catalog source | USD source | EUR source |
|---|---|---|---|
| Magic: The Gathering | Scryfall | Scryfall · enabled | Scryfall · enabled |
| Pokémon TCG | Pokémon TCG data repository | TCGCSV · selected, disabled | Cardmarket · selected, disabled |
| Yu-Gi-Oh! | YGOProDeck | TCGCSV · selected, disabled | Cardmarket · selected, disabled |
| Disney Lorcana | Lorcast | TCGCSV · selected, disabled | Cardmarket · selected, disabled |
| Flesh and Blood | the-fab-cube | TCGCSV · selected, disabled | Cardmarket · selected, disabled |
| One Piece | Bandai English list · default-off/report-only | TCGCSV · selected, disabled | Cardmarket · selected, disabled |
| Digimon | Bandai English list · default-off/report-only | TCGCSV · selected, disabled | Cardmarket · selected, disabled |
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 upstream price snapshot they actually use rather than promising that every game updated at the same moment. Price data older than 36 hours is visibly marked as a stale last-known value. Records without a source timestamp say that freshness is unavailable; their observation time is not relabeled as an upstream time.
Current price and missing values
Rankings use positive USD prices stored for an exact card printing. A missing price is excluded from averages, totals, and mover comparisons. It is not converted to $0 or silently replaced with an EUR value. Card pages present USD and EUR independently and identify whether a value is market, trend, average, or low. Legacy records remain visible when possible, but missing source, semantic, variant, or timestamp fields are labeled unavailable. 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. Graded observations are displayed in their own section with company and grade when known, and are never used for a raw card’s current price, history chart, rankings, or aggregates. TrendHQ does not appraise condition, assign a professional grade, calculate a population premium, or merge exceptional auction and private-sale records into ordinary raw-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.