I know Azure has API Management https://azure.microsoft.com/en-us/services/api-management/ https://azure.microsoft.com/en-us/services/api-management/ It doesn'

I know Azure has API Management https://azure.microsoft.com/en-us/services/api-management/ https://azure.microsoft.com/en-us/services/api-management/ It doesn't look like it has the built in monetization, but it should be fairly easy to smash a payment provider and API management together.