Proofreading

I am writing an article about a stock in a crowd-sourced website for financial markets. My English is not good enough. I would need to proofread my work before submitting it.
The article includes some business terms.
The website is American but British English is also fine.
The length of the article is 3.400 words and estimated project duration ideally between 3 to 5 days.
I let you propose the budget.
Thank you.