Article writers needed

Hello, I need 30 articles on different topics. Requirements:- i) All articles must be unique and plagiarism free. (I am a freelancer too & I use copyscape subscription. So be careful) ii) All articles would be 400 - 500 words. iii) Must be free from grammatical as well other punctuation errors, etc. iv) All articles need to be keyword optimized. (I'll give the details) v) The keywords should flow naturally without excessive use. vi) I am not in a hurry! So the assignment will be long-term and I may ask for articles from time to time. I will pay $1 for each 400 words article and a total of $1.10 for each 500 words article. Payment will be via GAF or Paypal (if you wish to) ***No Milestone / Advance Payment Will Be Given***