Due to severe limitations added by Steam on Steam inventory queries, refresh rates are now limited.
Although I'm actively working of this matter, I am unable to guarantee a perfectly working service at the moment (this includes supporters).
You can get more information on the SteamTrade Matcher Steam group
You need to be authenticated to use QuickMatch.
Please log in to SteamTrade Matcher with your Steam account by using the Sign in through Steam button
This will allow you to compare your inventory to find duplicate community items you could trade with Mantis!