Is there any API Rate Limit in Our Platform

Is there any API Rate Limit in Our Platform for

  1. client call yellow API
  2. yellow call client API

Yes, there is. I think it is 1000.

1000 request per second?

What is your use case here?
Because if you’re calling APIs / message it’s 5000/message.
The rate limit per second is another issue which is the number of times APIs can execute/second.