Is it suitable for GDAX as well?

[AndreyBerliner]

Is it can be used for GDAX as well?

[irufus]

I'm not sure if Coinbase ever added GDAX api support. You can do transfers with this API. Nevertheless, I maintain a Java wrapper under https://github.com/irufus/gdax-java

[AndreyBerliner]

Unfortunately I was not successful with that gdax-api. It's uses spring boot and other stuff that is far from my application that I'm building. I need very simple API like Binance API which is only containing java REST wrapper. Or like coinbase-java, that i can easy integrate in my application.