How can I turn this Android API scrapper into a data listener?

I used SSL pinning to reverse engineer an apps API. I can make GET requests for the information I desire. The problem is the information is very time sensitive and the API blocks if I make requests too fast.

The API pushes from Firebase onto the phone as soon as the data is available. So the phone is constantly listening and gets these updates as soon as possible, but if I perform too many GET requests it blocks with a 429 error.

Is there any way I can mimic the observing nature of this notification? All I have access to is the data it sends between the app and the server. I do not have the source code.