Tier1 Articles on Many Topics

I need articles written on many topics and would like to find a writer or writers who can do this. The articles must be tier 1 quality, and in perfect english. 500-700 word each. Each article must pass the following website tests:

copyscape.com
grammaly.com
duplichecker.com

Please provide your credentials for writing as well as what you would charge per article. Also let me know if you have written articles that pass grammarly.com before. Thank you!