ASK-IH: To contract or not?

I have an enterprise volume prospect who's wishing to use my SaaS, and, of course, they want certain functionality that's not in place.

If I was an incorporated entity with a legal department, I guess I'd issue a contract where I'd list all obligations and such, however, I'm an indie hacker who hasn't even incorporated.

So what's the right way to sign them in my situation?

#ask-ih