Enable Management API in VMWare vSphere Hypervisor

I am utilizing the free form of vmWares vSphere Hypervision 6. The issue I have is that I need to utilize the Management API.

I need to begin and stop vm’s and furthermore take and reset to depictions by means of contents yet the API is perused just for the free form. I utilized the specimen contents from The contents with compose get to are coming up short with
"Caught vmodl fault : Current license or ESXi version prohibits execution of the requested operation."

Is there a way to enable this or another way to access this api or do I have to buy the Standard license?

Thank you