The monitoring API is only available with an organization-scoped API key. Unfortunately we cannot provide a demo key for organizations at this point

Monitoring allows you to follow accounts, just like you would do by following them through the snapchat or instagram app. Monitoring lets you view all content posted to the public story of an account. It does not allow you to view private content or stats.

Items and posts
An item is a single 1-10 second image or video posted to snapchat or instagram.

A post contains 1 or more items. Items are grouped into posts if they are less than 3 hours apart