Selling my company hardware access time via AWS Marketplace

I'm trying to provide special hardware device in the AWS market place. I would be able to use AWS direct connect to put the network in AWS. My question is how to set up a service so that I can charge "Pay as you go" or "Monthly subscription". I'm not sure if this is SaaS or device management in the Marketplace. It is kind of similar to AWS Device Farm service but I want to do it for our hardware.