I'm so excited to play with this. I just ordered one. I've gone through two Oura rings (I do not reccomend). I'm not sure this will be reliable but it cost me $14.00 not $300 and doesn't charge me monthly to access a mediocre api.
replies(2):
Either sell the ring and include lifetime membership for free like Garmin [0], or _lease/rent_ the device on contract and charge a monthly fee. Don't do both
The Oura starts at $469 CAD [1] plus $7.99 CAD per month [2].
[0]: https://connect.garmin.com/
[1]: https://ouraring.com/product/rings/oura-ring-4/silver
[2]: https://support.ouraring.com/hc/en-us/articles/360052018753-...