Apparently, NobleGhost account is no longer active, due to ban because of angry software author (Gunthar) afraid of people who started responding to NobleGhost's trust page with positive feedbacks.
According to him, extended trial offer has ended (as well as discount for feedback).

I can vouch for this offer being legit, OP's trust painted red by haters, I've got my extended trial, and looking forward to be a reseller, thank you NobleGhost!

Good roadmap, wishing you the best luck developing this useful service!

Снизить нагрузку на сайт - и нормальная такая замена баннерной рекламе. Одобряю.

Idea: Allow fetching arbitrage data via API and/or WebSockets.