Does any security market use real-time settlements?

Question

I read on cnbc.com (mirror):

Tenev also advocated for real-time settlement instead of two-day settlement in order to help combat some of the chaos that occurred during the GameStop saga.

Does any security market use real-time settlements?

Answer 1

There seems to be no security market that use real-time settlements for stocks. However, as this Reddit discussion note, some other financial products such as futures and bitcoins settle immediately.