Are you looking to identify through the browser if the student is logged in their student portal so you can show various information on your website based on it? Now you can with Inteleagent. Here's the documentation: 

Student Login Status API

The agency through their website can call an API which will give the information of student login status. Here is the link → http://app.inteleagent.io/api/studentprofile/verify

By hitting on the above URL, you will get a response as

{"inteleagent_student":false} or {"inteleagent_student":true}

If the value is set as false, it means student is logged out. If the value is set as true, it means student is logged in.