Understanding our data & methodology

CollectorWorth’s mission is to bring transparency and accuracy to collectible pricing. Our market values are based on real sales from trusted marketplaces — not guesses, not estimates. Here’s how we do it.

Our Philosophy: True Market Value

We don’t believe in relying on a single sale to define value. Instead, we aggregate and clean data from multiple sources to calculate what a collector would reasonably expect to pay for an item today.

Step 1: Aggregating Sales Data

Our system pulls millions of completed listings every week from the most trusted marketplaces:

• eBay (completed/sold listings)
• TCGplayer (card market sales)
• Specialty marketplaces and stores across TCG and Funko Pop niches

For each listing, we capture details such as name, price, sale date, grade, condition, and shipping.

Step 2: Filtering & Cleaning Raw Data

Sales data is noisy. We apply a proprietary algorithm to clean listings before using them in calculations:

• Lot Removal: Filters out multi-item listings (e.g., “Charizard + 50 other cards”)
• Outlier Removal: Detects and removes price outliers using statistical analysis
• Shipping Normalization: Removes inflated shipping that skews prices
• Condition Matching: Ensures accurate comparisons across grades (e.g., PSA 10, Ungraded)
• Offer Filtering: Excludes listings sold via “Best Offer” without a known final price

Note: Values reflect items in NM condition or the specific grade shown — not a mix of all conditions.

Step 3: Calculating Market Value

• Weighted Average: Recent sales carry more weight than older ones
• Daily Updates: Our models re-calculate values every 24 hours
• Price Signal Count: Shows how many valid sales contribute to the current value

Special Cases: New or Rare Items

Newly released or extremely rare collectibles often have limited sales history. These values may fluctuate more until we collect enough high-confidence data. We’re constantly working on predictive improvements for these edge cases.

Have questions about our data model? Get in touch — we’re happy to walk you through it.