Roblox maintains the Robux system for everyone’s benefit and enjoyment. To keep it secure, some uses of Robux are not permitted, including:
Using third-party services to sell, trade, or give away Robux. This does not apply to Roblox gift cards.
Promotional codes that falsely appear to be offered by Roblox itself
Inappropriate use of the group payout system, including offering payment in Robux for acting as a model for assets, joining groups, referring members, or role-playing in experiences.
You also may not use third-party services or products to sell, either directly or as a bundle: in-experience items, exclusive features, or other in-experience enhancements.