Every TCG market tool shows you prices. Price trackers, deal finders, portfolio managers all answer the same question: what does this card cost right now?
tcgvibes.com asks a different question: are cards in this set moving together?
Why co-movement matters
When cards in a set change price independently, each card has its own story. Someone pulled a chase card, a deck fell out of meta, a seller listed below market. That's normal trading card market behavior.
When many cards in a set change price together, something else is happening. A shared cause is moving the whole set: a new release creating demand, a tournament result shifting the meta, or a wave of collector interest arriving at once.
How it shows up
Every tracked set carries a price index, anchored at 1.0 when tracking starts and built from repeated observations of the same printings. Next to it we count break-aways: cards whose 30-day move departs from the set's shared move. A moving index with few break-aways reads as a set moving as one. A flat index with a few sharp break-aways reads as single-card stories.
What this is not
This is not price prediction. Strong co-movement can point down as easily as up. We show market structure, whether cards are coupled or independent, not direction. Use it alongside price data, not instead of it.