What is the right TAX classification for a marketplace business?

I have a business that is a marketplace where we connect clients and talent. The talent is the one executing the contractor work. We as a business receive the payment from the client and we process the payment for the talent for the contractual work they do through our payment system Stripe (The talent is not an employee of ours). The question is when ($$$ threshold) and what form type (1099-NEC, 1099-K or 1099-MISC) should be populated for the talent during tax season. I heard regulations have recently changed. 

Also, are the threshold at a state level or federal level?