Here’s a quick answer at least for now :  NADEX says they will allow you to trade safely and allow you to grow big account without problem of withdrawing it. It’s a USA regulated exchange. It is subject to the USA financial industry laws. That’s a big deal because the USA understands the importance of establishing trust in financial matters. What about other binary options brokers? Well really the next step would be to see in your own country if you have binary options brokers that are regulated