As hinted at earlier, running a frontend for Wrapped USD is incentivized. This means third-parties are programmatically — no humans involved — compensated for creating interfaces to make interaction with the various Wrapped USD contracts easier. There's no "official UI".
To interact with Wrapped USD, you can choose from the list of frontends below.
This (inconclusive) list is provided for informational purposes only and is not a comment on safety or security