If they go that route you would basically have to bite the POS terminal to pay with a tooth-implanted crypto chip.

Personally I find the idea of such crypto wallets
in the ring format pretty impractical. They're easy to lose and a bit of a hassle to use in everyday situations. In addition wearing such ring-wallet in public could make you a target. Criminals looking to snatch crypto might consider you as their next potential victim at kidnapping attempts.
Just to be clear, Seedkeeper is not a signing device thus not a hardware wallet.
It's designed to store your seedphrases, Bitcoin wallet descriptors and other credentials safely in a secure element.
Seedkeeper comes with a 100% open-source desktop and mobile app to unleash it's full power:
- generate strong password like a pro
- manage your most valuable credentials (login, passwords, URL...)
- generate and store your BIP39 compatible seedphrases
- import and export your wallet descriptors for an optimal wallet management.
Now in a Ring form factor to always have your secrets with you.
In addition wearing such ring-wallet in public could make you a target.
I doubt anyone will ever know this ring is a "security" device. It does the opposite: it avoids attention completely. It looks like nothing. No markings, no logos, no color pop. Just a plain, unassuming ring.
That’s exactly the point: obscurity through minimalism, not theatrics.