Ok. So they give you a wallet address on GADX.com, you transfer BTC from CoinBase to GADX.com wallet address and then from their to your own private wallet address and then no fees. GADX doesn't consider taking BTC out of their wallet into your to be related to those taker's and maker's fees?
Another question then too. I have used Shapeshift.io to xfer BTC to BCH. Are you saying I could use this GADX.com to do the same at maybe a better rate?
Thanks! (sorry for newbie questions
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When you are in GDAX and click 'deposit', you can chose 'Coinbase account' and pick if you want to transfer coins or fiat.
The transfer is done internally, as GDAX is a part of Coinbase.
After that you can 'withdraw' from GDAX to any addresses you want, free of fees, or more worded more correctly GDAX cover the fees for you.
Takers and makers fees are only applied if you buy/sell.
GDAX only support BCT, ETH, LCT and fiat. So your Shapeshift case is not executable.