If you can make good posts, why not to join signature campaign yourself? Ok, I know that it takes some time to rank up, but for decent poster it's not that difficult task. And out of curiosity, how much you want to get for this work?
Those who not interested in this service kindly refrain from commenting.
You had to start self-moderated topic if you don't want to hear negative comments about yourself.
for campaigns that gives you good return, you must have a senior account with 250 merits and it difficult to get 250 merits these days.
Nonetheless my service is just to create post and people can post it themselves after evaluating the posts. One can pay me after one week of posting, no issue.
Many users will not trust this kind of offer since imagine you will give your account details to a random guys here so expect that you wouldn't get any client who would trust this service offered by yours. So maybe you should think another type of service since no account owner willing to risk their account for small bucks only. Signature campaign payments these days is so low.