1 sat = 1 sat - however I’m still surprised no one has use kind 300XX yet to broadcast BTC exchange rates.

Could be a cool way to query rates using a pubkey, kind and a d-tag identifier.

If the pubkey is trusted, you can be happy it’s valid, if you also check the created_at.

Being able to query across known/trusted pubkeys for rates could be awesome too - as you can hunt for the best deal.

Other real-time data could be interesting if shared like this too.