How Our Data Works

We only use sold listings

Asking prices mean nothing. A seller can list a card for any amount they like. Graded Edge pulls exclusively from completed, sold eBay listings — prices that a real buyer actually paid. This is the only honest measure of what a card is worth right now.

Raw cards are filtered to Near Mint or better condition. PSA graded listings are filtered by grade tier (PSA 9 and PSA 10 tracked separately). This means you're never comparing apples to oranges.

Up to 200 data points per grade, not 10

Most competitor tools look at a handful of recent sales — typically the last 10 — and average them. That's a small and easily distorted sample. A single bulk sale or an uninformed buyer can throw the whole figure off.

We collect up to 200 of the most recent sold listings per grade tier for every card we track. Across 7,000 cards and three grade tiers, that adds up to millions of data points — making our prices far more stable and resistant to manipulation than any small-sample average.

Outliers are removed intelligently

Most tools either include all sales (leaving outliers to distort the average) or remove anything outside a fixed percentage range (which can accidentally strip out legitimate price movements).

We use a trend-aware outlier detection algorithm. We first fit a trend line through each card's recent price history, then identify sales that are anomalous relative to that trend. This means:

• A card that's genuinely rising in value won't have its recent high prices flagged as outliers
• A one-off distressed sale or uninformed seller pricing too low gets excluded
• Best-offer-accepted sales are always excluded — these are privately negotiated prices that don't reflect the open market

Filtering out fakes, lots and noise

Raw eBay data is full of listings that would corrupt a price average if included. We actively filter out:

• Multi-card lots — listings that bundle several cards together produce inflated prices that don't reflect the value of any individual card
• Likely fakes and proxies — listings with language patterns or pricing consistent with counterfeit cards are excluded
• Variant mismatches — a search for a specific card variant won't accidentally include sales of a different variant with a similar name

The result is a price derived from genuine single-card sales — the kind you'd actually encounter when buying or selling.

Three grade tiers tracked independently

Raw (ungraded), PSA 9, and PSA 10 each have entirely separate price histories. The ROI calculation isn't a guess — it's the difference between what you'd pay for the raw card today and what a graded copy is actually selling for, minus your grading fee.

We also cross-reference raw card prices against TCGPlayer market data where available, giving you a second independent baseline for the ungraded price.

Maximising return on every PSA submission

PSA grading isn't just about the cost per card — it's about your time. Each submission ties up money and months of waiting. The cards you choose to submit should be the ones that give you the greatest return per slot.

This is why expected value matters. Submitting ten mediocre cards for $20 profit each is a worse use of a submission than two cards at $80 each. Our profit rankings are designed to surface the highest-value opportunities first, so that every card you send to PSA compounds your returns rather than diluting them.

Liquidity data tells you what the price doesn't

A card might have a strong PSA 10 price on paper, but if only two copies have sold in the last 90 days, that price is speculative. We show sales volume over the last 7, 30, and 90 days for each grade tier, so you can see at a glance whether a card is liquid or sitting on a thin market.

This matters enormously when you're deciding whether to submit for grading. A high ROI on an illiquid card isn't an opportunity — it's a risk.

PSA population data in context

We pull weekly PSA population report data for every card we track, so you can see how many copies have been graded at each tier. A card with 10,000 PSA 10 copies in circulation behaves very differently to one with 50. Population data gives you the context to interpret price and volume numbers correctly.

Cards with fewer than 50 total graded copies are excluded from our profit rankings — there isn't enough market data to make a meaningful recommendation.

UK and US markets priced separately

Graded card prices differ meaningfully between the UK and US eBay markets — different buyer pools, different import costs, different currency dynamics. We maintain entirely separate price histories and calculations for each market rather than blending them into a misleading global average.

UK collectors see prices from UK sold listings. US collectors see prices from US sold listings. Each market is treated on its own terms.