Article writer needed for long term project.

Hello. I need article native English writer who can write on different niche. I am willing to pay 0.5$ for the first 150 article. Articles will be of 400-500 words. The articles need to be unique and pass copyscape. The grammar and punctuation will be checked as well. If the article does not pass copyscape or have many typing or grammar errors I will not pay for it and the project will be canceled. I will increase the rate after 150 articles. If everything goes well total monthly articles given will be 500+ depending on how much writer can provide per day. Please only serious providers should apply. Thanks