Jawbone UP4 – yes this is a fitness band – has support for payments, if you’re an Amex customer. But the fine print is just weird, from an email Jawbone sent me today:

Amex Payments: Only one U.S. Amex-issued consumer, or small business credit, or charge Card can be connected to an UP4™ band and can’t be changed. Only available when you check out at merchants which accept American Express contactless payments. Payment capability expires as early as 7/31/2019. See important terms and limitations.

Sounds like a swell experience. I’ve yet to try the UP4, but I have tested both the UP2 and the UP3 (and the UP24 before that). They’re overall good fitness bands, and definitely the leader if you want to wake up from vibrating arm links.