Auto-accepting trade offers by following rules:
* Steam trading cards only (common or foil, not emoticons nor backgrounds)
* The same number of cards from the same games sets (1:1 / 3:3 / 7:7 etc)
* No trade hold (Mobile Authenticator on)
* advances (A A -> A B , good // A A _ C D E <> _ B B C D E)
* doesn't change (A B -> A C , neutral // A B _ D D E <> A _ C C D E)
i.e. do not break my set completion (A C -> A A , bad // A B C _ E E <> A A B _ D E = offer ignored).

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My type is Fair in ASF-STM terms, so please check my set completion state before sending an offer.
I'm not selling cards nor trading cross-set.

If your offer was not accepted almost instantly, then it is not valid to rules above and was ignored.
In some cases (e.g. I have only 4 different cards without duplicates out of 5 in set // A B C _ E) it might been manually accepted later (up to a few days, because of real life things like touching grass).

Instantly declined trade offers means trade blocklisting for suspicious abusive behaviour (1$:1c, trades just for marketable pricier cards without intention to complete the set).

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Feel free to add me for easier finding needed cards via game badge pages.
SteamTradeMatcher link [www.steamtradematcher.com]

Direct trade link

Also, list of useful tools:
https://asf.justarchi.net/STM and free matching script for it https://github.com/Rudokhvist/ASF-STM
https://github.com/Mr-VIT/SteamWebTools
https://github.com/SteamDatabase/BrowserExtension
https://github.com/IsThereAnyDeal/AugmentedSteam