This app polls GDAX and hits a webhook whenever an order has been filled. I currently use IFTTT Maker to send iOS push notifications.
Create an IFTTT account and set up a new maker webhook https://ifttt.com/maker_webhooks and set it up to point at something (like app notifications):
Set the notification equal to:
GDAX {{Value1}} {{Value2}}: {{Value3}}
docker build -t gdax-notifier .
Create a .env file with:
# required
GDAX_API_KEY=
GDAX_API_SECRET=
GDAX_API_PASS=
MAKER_EVENT=
MAKER_KEY=
# background
docker run -it -d --restart always --name gdax-notifier --env-file .env gdax-notifier
# foreground
docker run -it --rm --name gdax-notifier --env-file .env gdax-notifier