Invisible fences: a town where secrets are currency

I had this weird idea pop into my head earlier - imagine a town where privacy is literally the most valuable thing you own. Like, instead of money, people trade secrets and personal info. You wanna buy groceries? Better be ready to spill something juicy. But there's this underground group trying to break the system, trading fake secrets or something. Dunno, just a random thought. Could be a cool story or something, maybe someone else can run with it...