I think the idea is that there will be, but not currently because they're still testing it.

Although it is hard to understand what they're doing because they're not very clear themselves. The idea seems to be that chatGPT will remain free, possibly with some improvements in the future, and then a paid API will be released for people to train their own version of the AI on their own datasets. That paid API is what you're after, but it doesn't exist yet.

What would really be useful is if it could take in files as prompts. For example I can feed it an Excel spreadsheet and then it could write blurb outlining more or less what the spreadsheet says. Writing up reports on spreadsheet is a massively boring task, no one likes it and if it could just be automated that would be fantastic. I'm sure chatGPT is clever enough to do it but it's inability to take in files means it can't. What is not clear is if the API would allow me/someone else to build in that functionality.