If you’re a B2B business idea and want to find out whether it's valid and worth pursuing, there is one question that you should ask above all others:
Will they buy?
Don't just ask prospective customers "Will you buy it if I build it?"
That's not enough. You need to sell them your product. They shouldn't answer with words, but with dollars.
If they give you money = "Yes, I will buy this."
If they don't give you money (even if they say they would) = "No, I won't buy this."
Money is the ultimate and absolute validation that your business is creating value in the world.