You can view the number of live viewers for a given broadcast by selecting "View Statistics" or by visiting https://mystreamspot.com/usage/.
Under "StreamSpot Usage Summary," you will see the time frame in which statistics are (being) displayed. You can go back in 2-week increments to see more.
Under "Total Viewers and Average Viewer Duration," you will see every broadcast for that 2-week span. By hovering on a date, you will see the amount of live viewers and average duration your viewers watched.
To learn more about Basic Usage Reports in StreamSpot, see the link to the other Knowledgebase article below: