RSS, API, Hybrid account possible?

Not sure what I’m asking for so hoping someone else can put a name to it

I’d like to know if I can set up a user account to post periodic sale items

Many affiliate programs have widgets and other ways to post sale items in a fresh rotating manner,
I’d like to offer retailers the ability to have their accounts post an item, and then they get the normal notices of replies and ability to interact

So a hybrid account, part discobot and part human

Does this exist to anyone’s knowledge, or, does anyone have any ideas on how to make it happen?

Thank you