The problem is that by looking at the key you don't have any way to find out which game this key is for or whether it is already used - unless you try to redeem it. Steam does not support this in order to make it harder for key generators.
So there won't be any site of the kind you're looking for.
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hi all
i know there are several sites that estimate the value of games in your steam account
is there a site where you can copy a list of your unredeemed keys (like my groupees, humble bundle, indie gala, etc, keys) and see what that list might be worth?
thx
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