Yeah, technically your phone isn't even involved. The watch manages all the cryptographic keys independently and you can add cards through the Google Wallet app or website.
Also Garmin watches if you'd prefer wearing something with battery lasting weeks, not hours ;)
That's what I use. The Garmin O/S UX is a bit ass, but usable and I never need to carry money if I am going on a run.
"a bit ass" is a charitable way to put it, but same here, it's dependable, dead stable, good enough as a backup map.
It's not that bad, my battery lasts around 36 hours. I take it off when I go to shower and by the time I remember to put it back on (~30min) it's usually back to 90%+.