Card index
The Corner Index tracks what graded cards are worth and how many copies are actually for sale. Vault rules are measured against it: how much a vault may pay, and how much of the market it aims to own.
Not live yet. The numbers below are illustrative.
- Fair value
- What a copy at this grade sells for today, from recent sales and custodian quotes, with outliers removed.
- Float
- Copies realistically for sale: listed, held at a custodian, or recently traded. Most graded copies never come to market.
- Cost to 25%
- Roughly what a vault would spend to own a quarter of the float at fair value.
- Cornerability
- A score from 0 to 100. Higher means a vault can own a meaningful share of the float for less money.
Example cards
Sorted by cornerability| Card | Grade | Fair value | Graded copies | Float | Cost to 25% | Cornerability |
|---|---|---|---|---|---|---|
| GengarFossil 1st Edition | PSA 10 | $1,900 | 390 | 22 | $10,450 | 98 |
| KabutoFossil 1st Edition | PSA 9 | $38 | 3,900 | 1,380 | $13,110 | 85 |
| LugiaNeo Genesis 1st Edition | PSA 9 | $2,600 | 1,100 | 95 | $61,750 | 66 |
| CharizardBase Set Unlimited | PSA 8 | $1,150 | 7,800 | 410 | $117,875 | 56 |
| CharizardBase Set 1st Edition | PSA 9 | $95,000 | 900 | 18 | $427,500 | 34 |
Example formula: start at 100, subtract 12 points per doubling of the cost to 25% above $10,000, and up to 30 points as the float approaches the whole graded population. The live Index will publish its method and inputs.
Why copies for sale, not copies printed
Kabuto showed the gap. More than 100,000 copies were printed, yet its price moved on the few thousand graded copies that actually traded. What matters is the share of the market a vault can own, so the Index measures the copies for sale.
How vaults use it
Each vault sets the most it may pay over fair value and the share of copies for sale it aims to own. Every purchase is public, so anyone can compare the price paid with the Index price that day. See the guardrails.