What do you need to turn your API into a SaaS?

While working on my own project, I often got stuck at the stage where I had to build the essential but generic pieces that I would need to start selling sell them.

Over the last months, I have been doing some yak shaving and I would love to hear what you think. I have tried to collect everything I would need to spin up a SaaS around an API. Some of the elements I have built myself but in most cases, I have integrated with the other services (like Stripe Customer Portal for billing and Intercom for support).

If you have an abandoned API with some potential in a dusty git repo, I would be very interested to hear if you think that the service I describe at https://apibiz.io could help you bring it to life.