Execution through Rest JSON API's


Just wanted to confirm that once the Signal is generated of BUY or SELL , can we call Rest API's (Web Services) for Buy / Sell execution

There's a discussion here.

Hello, I want to be able to graph the new minimums and the new maximums in an indicator. Also create my AD line of advances and descents. The data is in JSON format on the web with direct link and raw data attached below. Can I from Amibroker make this collection of this specific data and make the indicators as I want? Thank you.
link WSJ