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The Slabline Blog

Guides on valuing, insuring, and protecting a graded card collection — from the team building the 0–1000 risk index for the hobby.

• Guide · 4 min
  What Is a Slabline Score? The 0–1000 Risk Index for Graded Cards
  The Slabline Score is a credit-style 0–1000 rating of how well-protected your graded card collection is — across insurance, concentration, storage, liquidity, and provenance. Here is how it works.
• Insurance · 5 min
  How to Insure Your Graded Card Collection (Broker-Ready Schedule)
  Homeowners insurance rarely covers a graded card collection at full value. Here is how to document yours with a broker-ready insurance schedule a carrier will actually accept.
• Guide · 4 min
  PSA 9 vs PSA 10: Is the Gem Mint Premium Worth It?
  The jump from PSA 9 to PSA 10 can double — or 10x — a card’s value. Here is how to think about the gem-mint premium, with real examples across sports and Pokémon.
• Methodology · 4 min
  How Graded Card Values Are Determined (Real Comps Explained)
  A graded card is worth what comparable copies actually sell for — not a guess. Here is how comp-based valuation works and why more sales mean a tighter number.

Slabline provides informational estimates only — not a certified appraisal, insurance, or financial advice.