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Beta Release: JK Index is in active development. Data coverage is expanding and you may see gaps or inconsistencies as we iterate. Feedback is welcome.

Before the Slab

BTS Blitz

Guess the Grade in 30 Seconds.

Five cards. Thirty seconds each.

Inspect both sides, lock your guess, and reveal the actual PSA grade.

5 cards · 30 seconds each · about 3 minutes

Example round

Card 1 of 530s
Front

Guess the Grade

Four choices

78910
Reveal stays sealed until your guess is locked.
  1. 1Inspect both sides
  2. 2Guess the Grade
  3. 3Reveal the result

Private beta access is granted to a small testing cohort. Requesting access raises your hand for an upcoming test; it does not automatically grant entry.