Dear Ma'am/Sir,
I would like to express my interest in your project, which perfectly matches my skills and experience.
As a Greek native with a very long professional experience as a translator and proofreader, I am able to undertake your project, i.e. test your site and give you my feedback. Please note that I used to be a soccer lover in the past, while I have used OPAP services several times.
Your price of 10 $ is accepted for the testing and I am also available to cooperate with you as a proofreader of your site for a separately discussed rate.
Please feel free to contact me for a further discussion.