The one rule: use sold prices, not asking prices
The single biggest mistake is pricing a card off active listings — what sellers hope to get. Those run high and often sit unsold. A card’s real value is the recent sold comps for the same card in the same grade. Every Slabline value is built from sold data, matched to the exact card by cert number and grade — a PSA 10 and a PSA 9 of the same card are priced separately, because they trade separately.
Three free ways to check your card
By cert number
Enter the PSA / BGS / SGC / CGC / TAG cert number above for an instant value on that exact slab.
By scanning the slab
Scan the label — Slabline reads the grader and cert automatically, then returns the value.
Browse the value guide
Look up specific cards in Slabline’s free card-value pages, each with a full price-by-grade ladder.
What actually drives the value
- Grade
Condition is the biggest multiplier — a Gem Mint 10 can be worth many times a 9 of the same card. Slabline shows the price at every grade.
- Scarcity
A low graded population commands a premium; a card that’s common in high grades has capped upside. Slabline shows the gem rate and population by grade.
- Demand
The player, character, or set and how sought-after they are right now — the reason two cards with identical grades sell for wildly different prices.
- Timing
Values move with the market — a playoff run, a new set, or a print reprint all shift comps. Slabline values refresh with the market.
Raw card? Value it before you grade
If your card isn’t graded yet, its value depends on the grade it would receive. Pre-Grade predicts that grade from a photo and shows the value at it — so you can decide whether grading is worth it before you pay a cent.
