Updated: Aug 10, 2019
FedNow is going to be a real-time 24x7 instant service for payments. It is intended to serve the banking industry who can use this backbone for meeting client needs.
UK has a Faster Payment System in place for a few years now.
Switzerland has the best one: flat price and instant transfer for payments large and small; but it is NOT 24x7.
FAQs on this answered here: https://www.federalreserve.gov/newsevents/pressreleases/files/other20190805a2.pdf