A more detailed tutorial is available on: https://www.uradmonitor.com/wordpress/wp-content/uploads/2017/01/uradmonitor_api_example_response.pdf
You will need to pass the user-id and the user-key as headers to the HTTP Get call (go to the dashboard , then open the API tab for the right values). Next, for the actual call, you can use extensions in Chrome for that (like DHC) or online tools like Hurl.it . See the pic for an example with the latter.
Alternatively , you can also use the “Data” tab in the dashboard to achieve the same thing, easier.
Feel free to post any questions on this, I’d love to help.