Most API endpoints have enforced pagination. There are currently no globally defined upper limits to how much can be requested per_page, but please try to maintain a healthy balance between number of requests and amount of data requested via per_page with each request. When pulling large amounts of data, we recommend starting with per_page=1000 and optimizing as necessary. Please contact support@tpastream.com if you intend to pull large amounts of data, as we can help define a strategy or custom endpoint to better serve both your needs & ours.