Hey @amiranda,
Happy to help clarify.
To that end, I should first note that Zoom rate limits apply to API requests and are applied on an account level. If you have several different apps under your account, the credentials associated with each of these will all count towards your rate limits.
In regards to the Web SDK, this can hold up to 1000 attendees if you have the right plan—if you have a Pro account, it holds up to 100 participants by default unless you buy a Meeting 500 add-on. Business accounts can hold up to 300 participants by default. You can see our plan capacities here:
Keep in mind that the number of attendees in your meetings or webinars does not affect your API rate limits.
I hope this helps to clarify, but let me know if you have any questions about this.
Thanks,
Will