Visit https://www.spark.io/build to get the ID of the core to access and your unique API token.
Input the function name to call along with the data to pass and hit the post button to attempt to send it to the core.
Enter the variable name to query and press the Get button, the value will appear in the field if successful. If you wish to auto-query, check the box. Enter a custom time in ms or leave it blank for the default refresh time of 5 seconds.