Which chains does USDD support?

Could you kindly elaborate on the various blockchain networks that are currently compatible with the USDD stablecoin? I'm interested in understanding which specific chains provide support for this particular financial instrument, and how this affects its usability and functionality across different ecosystems. Additionally, it would be helpful to know if there are any plans to expand the support to additional chains in the future, and what factors might influence such decisions. Thank you for your assistance in clarifying this matter.