What is USDX backed by?

As a cryptocurrency enthusiast and investor, I'm curious to know: What is the fundamental value proposition behind USDX? What assets or guarantees does it rely on to maintain its stability and credibility? In today's volatile crypto market, understanding the underpinnings of any digital asset is crucial. Could you elaborate on the underlying collateral or mechanisms that USDX leverages to ensure its value remains stable and trustworthy?