Do I need a Boosteroid account to buy a key?

Short answer

No. You can complete a purchase as a guest with just an email and payment method. An account becomes useful afterward, since it's what lets you revisit My Orders, re-download an invoice, or re-open an activation guide for something you bought weeks ago.

What about cloud gaming?

Cloud gaming is a separate, optional add-on — it's not bundled into a regular purchase and doesn't require anything extra from you unless you choose to stream a title.

Good to know:if you already have a Boosteroid account from cloud gaming, it works the same way for the marketplace — no second account needed.