Sendpress SPNL Log – what is it

I receive an email including:

“Notification:
Spnl_log (private to published); identifier: 5660; name: API Action tracker”

SPNL log has suddenly appeared on my dashboard and created a post called “API Action Tracker”

It contains:

{“spnl-api”:”tracker”,”key”:”public”,”token”:””,”query”:null,”type”:null,”date”:null,”startdate”:null,”enddate”:null,”id”:”749″,”email”:”5596″,”url”:”http://www.hdfhs.org.uk”,”data”:true}

Since my site has also had a hack of some sort recently I need to know what this is. As far as I can see it is associated with Sendpress and is alarming until it is explained.
Help Please.