I've written about this before, but American is terribly far behind on this:
https://penguindreams.org/blog/the-american-banking-system-i...
The closest thing we have in the US is Zelle, which is not a government mandated standard (like ACH) but a private standard created by banks and which only a fraction of banks in the US currently support.
And of course there are services like Venmo/Paypal, but these are private opt-in services, where as most other countries have this system mandated and fee-free between banks via their government reserve banks.