The collector comes first.
Built by a collector.
For collectors.
Card research, grading games and collection tools—for the cards you care about.
“I’ve been a collector my whole life.”
Pricing my cards meant jumping between five to seven different websites. I started JK Index in November 2025 to build something I would actually use.
That first frustration led to bigger questions about condition, value and the market. The product has evolved, but the idea hasn’t: make collecting a little less fragmented.
What you can do here
Follow your curiosity.
For collectors, buyers and sellers.
Start with the tool you need.
Know your cards.
Explore prices, recorded sales and sets across Pokémon, One Piece and Riftbound.
Explore the IndexPractice your eye.
Five cards. Make your grade calls, then see the results. Try it without an account.
Play the free challengeLook a little closer.
Review visible condition risks from your photos—not an assigned grade or prediction. Verification and availability limits apply.
Explore grading readinessMake your market read.
Explore grading outcomes through YES/NO practice markets. Practice JKB has no cash value.
Explore Before the SlabKeep your collection together.
Organize your holdings and follow your collection over time.
Open your portfolioFind your next card.
Browse collector listings, photos and seller terms.
Browse the marketplaceA few useful answers
Good to know.
Can I try it without an account?
Yes. The free five-card BTS Blitz challenge lets you play and see your full result before signing up. Account-based features have their own requirements.
Is AI Grading Readiness a grading service?
No. It reviews visible condition risks from photos; it does not assign or predict a grade. Sign-in, email verification, availability and usage limits apply.
Does practice JKB have cash value?
No. Practice JKB cannot be withdrawn or redeemed into marketplace funds. Feature-specific eligibility and rules apply.
Is JK Index affiliated with PSA?
JK Index is not affiliated with or endorsed by PSA. Blitz and Before the Slab use grading outcomes for games and practice markets, not card certification.
Something else on your mind? Get in touch.
The short version
Key facts
- Name
- JK Index
- Founder
- James
- Founded
- November 2025
- Built for
- Trading-card collectors