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, not cross-set)
* 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 badge state before sending an offer.

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