How much is a PSA 10 Steven's Metagross EX #289 worth?
The PSA 10 Steven's Metagross EX #289 from Ascended Heroes (English) has a median market value of $596, with recent sales ranging $485 to $725 — based on 26 recent graded sales.
Is a PSA 10 Steven's Metagross EX #289 worth more than ungraded?
Yes. A PSA 10 copy has a median value of $596 versus about $100 ungraded — roughly a 6.0× premium for the PSA 10 grade.
Where do PokéTT's PSA 10 prices come from?
PokéTT tracks real graded sales across eBay, Yahoo Auctions and Mercari, then shows the median within the PSA 10 grade — not a single outlier sale — so the mark reflects the true market.