[youtube-api] Youtube API Limitations

I'm building a pretty large app for a client, and had some questions about heavy API usage.

Basically this app is going to aggregate feeds from various sources. My client estimates around 900 follow-able users will be in this system to start out, with more being added over time. He wants to update the feed data every 15 minutes, so we would need to update one user feed per second, assuming 900 feeds and a 15 minute TTL. As the requests take a few seconds to complete, we would then need to load balance across a few threads to tackle the queue asynchronously.

My question is, should I be worried about quota errors or hitting any kind of limitations? If so, what are our options?

I've already read their help pages and documentation, and it's very vague and not really helpful. I need concrete numbers. It's not feasible to load test their API to figure out the limitation. The matter is not helped by Google deferring all support to a non-official channel such as StackOverflow where people do not have knowledge of the Youtube internals.

Thanks in advance...

Apart from other answer There are calculator provided by Youtube to check your usage. It is good to identify your usage. https://developers.google.com/youtube/v3/determine_quota_cost

A little bit late, but you can request a higher quote here: https://support.google.com/youtube/contact/yt_api_form