I didn't see any cryptocurrency exchanges in their list of approved exchanges. How does one find out whether a cryptocurrency exchange is registered properly with the SEC?
It's very simple. The SEC will prosecute one of the big boy "exchanges" and bring that company to a screeching halt. All of the rest will have to meet stringent regulatory requirements in order to service American customers.
Coinbase/GDAX have always focused on compliance, and Circle discussed the Poloniex acquisition with the SEC beforehand, and both are actively working with regulators. How that turns out will be interesting to see