Where is pyusd available?

Could you elaborate on the availability of pyusd? I'm curious to know if it's a widely accessible tool or service, or if it's limited to certain regions or platforms. Is pyusd an open-source project that can be freely downloaded and used? Or is it a proprietary service that requires subscription or licensing? Additionally, are there any specific requirements or dependencies that need to be met in order to use pyusd? I'd appreciate any details you can provide on its accessibility and availability.