Does that exist?
Essentially https://lightningaddress.com but the JSON blob returned in the /.well-known-HTTP request to the domain includes an unused on chain receive address as an option. Backed by BTCPayServer or something way simpler.
I was just annoyed by a "Bitcoin" podcast actually spelling out the identifiers for 2 fiat payment rails for donating to some unrelated cause. Having pronounceable/memorable/tagable on chain addresses might not have value in 100 years if fees become high friction, but would serve us well during the next 10.
Bonus points for PayNym and other more private tx identifier support too. I guess PayNym by itself is that in a way, but if you already have your nym associated with a domain and just want privacy onward from that..
https://github.com/lnurl/luds/blob/legacy/lnurl-pay.md <-- seems to indicate: NO
/.well-known/lnpay/
-response and not have to do an additional request using the returned "callback"-URL.