Every Inkay card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Inkay card is worth
The most valuable Inkay on this list is Inkay from McDonald's Promos 2014 at $19.87£14.96€17.50, and the 18 priced copies across 16 sets are worth $32£24€28 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.
Inkay is printed in Japanese as well: 24 cards across 19 sets, the most valuable of them Inkay (Mirror Holofoil) from GX Ultra Shiny at $7.98£6.01€7.03. 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 Inkay sold for $385£289.77€339.06. reverse holo printings are priced separately from the standard card, because they do not trade at the same money.
If you are trying to identify which Inkay 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: McDonald's Promos 2014, Hidden Fates: Shiny Vault, XY - Roaring Skies.