Inquiry about Commercial Use of Perplexity's Online Model API

I am interested in utilizing Perplexity's online model API for commercial purposes. Could you please provide the following information :

Is there a limit on the number of simultaneous users who can access the model API?
What is the maximum number of requests each user can make within a specified timeframe (e.g., per minute or per hour)?

Receiving detailed information about these aspects will help me make an informed decision about integrating Perplexity's API into my commercial project. I appreciate your prompt response to this inquiry.