This account is configured to act in the same manner as a STM User does. You are supposed to use provided STM QuickMatch link at the top of this profile when trading with this account.

However, if for any reason, you are not comfortable enough to use a third-party website. You can also send a manual 1:1 item (from same game and equal rarity) trade. Your offer will be accepted if it follows the rules explained below (GOOD or NEUTRAL), otherwise it will be declined.

⠀⠀ • A trade offer is GOOD if my progress towards the set completion advances.
⠀⠀ 𝘈𝘯 𝘦𝘹𝘢𝘮𝘱𝘭𝘦: Card-A, Card-A (before) <~~~> Card-A, Card-B (after)

⠀⠀ • Trade is NEUTRAL if my progress towards the set completion stays in-tact.
⠀⠀ 𝘈𝘯 𝘦𝘹𝘢𝘮𝘱𝘭𝘦: Card-A, Card-B (before) <~~~> Card-A, Card-C (after)

⠀⠀ • A trade is BAD if my progress towards the set completion declines.
⠀⠀ 𝘈𝘯 𝘦𝘹𝘢𝘮𝘱𝘭𝘦: Card-A, Card-C (before) <~~~> Card-A, Card-A (after)

Above rules depict that any user using STM website for dupes matching should always be accepted. However, this bot also accepts neutral trades, since in those ones it isn't actually losing anything.

Moreover, the logic works properly if you add something extra to the trade, as long as all above conditions are met. Overpay, would be gratifying but absolutely not mandatory, as well as donations.