http-functions post limit per second

I’m using http-functions with post method to insert data into my wix collection.
I’m concerned about having too many function calls in short period of time.
What’s the limit to call my http-function per second?
In other words, how many post calls can I make in a second? or a minute?
If there is a limit, will upgrading my account plan increase the limit?
Thank you in advance.