API Rate limit increase for miltiple aplications

Hi
What is the rate limit per IP adress and does this apply per endpoint or combined API calls per IP?
If i use one IP for separate endpoints and separate aplications does this breach the CH policy ?
Does this rules apply for both rest API and streming API . For streeam API i need to call difrent endpoints similtaniosly. Will this close other endpoints connection if same IP is used or i need separate IP for each?
Could you please someone contact me or email me some cost indications for rest API limit increase. I have emailed CH long ago but had no reply.

Many thanks