My Venmo cashout transfers take &lt;24h if I do them during business hours.   Not instant, but not several days.<p>How does the rest of the world manage instant transfers?  I thought the ACH method was still in use not because we&#x27;re technologically slow (see: High Frequency Trading) but because it saves a huge amount of coordination to sum up net inter-bank transfers at the end of the day rather than constantly shuffling money around due to the fact that the net is often very small.