Every Yamper card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Yamper card is worth
The most valuable Yamper on this list is Yamper from Shining Fates: Shiny Vault at $17.61£13.25€15.51, and the 9 priced copies across 6 sets are worth $23£17€20 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
Yamper is printed in Japanese as well: 14 cards across 10 sets, the most valuable of them Yamper from Shiny Star V at $11.62£8.75€10.23. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for Yamper sold for $100.09£75.33€88.15. reverse holo printings are priced separately from the standard card, because they do not trade at the same money. Rarities here include Illustration Rare.
If you are trying to identify which Yamper you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: Shining Fates: Shiny Vault, Phantasmal Flames, Sword & Shield Base Set.