Chartboost
Chartboost COPPA Documentation
This network allows you to specify the target audience for your application. Simply navigate to the 'Apps Management' section, choose the application you wish to modify, and click on the 'Edit' button. Within the editing interface, you'll find a section where you can define the nature of your audience.
If you have a mixed audience or an audience that doesn’t contain any children under 13, you must select the last option.