I have a K-ring (formerly Kerv) contactless payment ring. It’s a fantastic piece of hardware, but it’s a prepaid card which you have to top up. Also their customer support and web interface are awful, and they don’t have a mobile app, which is bizarre.
It would be great if I could have a similar ring from Curve.
PS. Kerv changed their name because of a trademark dispute with a similarly name company in a related business. I assume you can’t answer this, but was it Curve? You should have just bought and integrated them instead