gdax is a command line tool that allows the user to get snapshot or streaming quotes from Coinbase's GDAX exchange: https://www.gdax.com/trade/BTC-USD
API Docs: https://docs.gdax.com/
Make sure you have Go installed: https://golang.org/doc/install
To install gdax run:
go get github.com/3cb/gdax
Make sure your PATH includes the $GOPATH/bin directory so the commands can be used:
export PATH=$PATH:$GOPATH/bin
For a snapshot quote simply run the binary from the command line:
gdax
For streaming quotes through a websocket connection run with the -s flag:
gdax -s
That's it!