Apparently I can't post a link as a new user (fair policy, I suppose) but a smartstrap with NFC payments was demoed at the Pebble Rocks Boulder Hackathon this past weekend.
Search Reddit for "NFC Payment Smartstrap for Pebble Time is a GO! " for more details.
Search Reddit for "NFC Payment Smartstrap for Pebble Time is a GO! " for more details.