What about Envato API for Commercial purpose use?

Hello Everyone, Its about today I have seen Envato api marketplace app and most of the websites are down or not available now. Only few like ENSEEK and TICKSY.

I want to know the legal use of Envato API when your product is for revenue generation streams like Ticksy. What it does you need to pay to have a support ticket system and Ticksy is totally integrated with Envato API in order to validate user purchase and account verification.

So in simple, we can create web applications/websites by using Envato API as part of the system and run the website commercial business purpose like verify theme purchase licenses right?

Need Guidance