I think a good hook at the beginning is saving small local business the exorbitant credit card processing fee.

the only way I've thought of so far is a little clunky: a local tap-to-pay "gift card" that you can top up with fiat at any participating merchant, and using it in stores gets you a 2% (a bit lower than credit card fee) discount. no-brainer for locals who shop a lot.

behind the scenes it's cashu with a mint run by a local maxi. he would likely have to take a bit of a risk - he'd want to fiat-back every dollar deposited so if the price drops customers don't lose. on the upside... if the price zooms he might be able to kick back a reward to the merchants that month.