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Yes you could use GDAX.com same login details as Coinbase. Just remember though when you BTC is on an exchange and not in your own wallet with a private key it is at risk.

Several exchanges allow for that type of setting, but a stop loss has also proven to be dangerous, unless you are able to monitor your position full time. I basically gave up using them, because the price would dip while I was at work, I'd get home, log on only to find my trigger was met and I am back in cash. The market however recovered, and the BTC was listed $10 more than when I went to work in the morning. Admittedly, the market is more stable now, than in 2013, but I still don't use auto trades anymore. A 24hr market is tough as well, since when the USA trading tapers, the China/Japan trading kicks in... when the hell can a guy get some rest.

I Normally use a TD Ameritrade Rule set that sets a buy condition if a Trade is Executed , plus i tend to use a Stop Limit Rather than just a stop for my AG trades its normally a 0.25/0.02 , but once executed i set a buy of 50% 20 cents and again at 40 cents . as long as im in the green , and you put in a weekly trade in the buy , yo tend to rarely go into the red

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