In the first episode glimpses of money did not look like our bills, and I wondered if it was Canadian, but the show is set in Washington DC. In episode 4 was a better view (Valorum posted a screen grab in an Answer), and I could see that someone imagined a future evolved design for what bills (Treasury Notes) would look like.
Does anyone have a pointer to details concerning this design? I mean, was there a behind the scenes article or bonus content that describes how the design was created and the artist's thoughts behind it?