How expensive is ChatGPT?

So, I've been hearing a lot about ChatGPT recently and I'm curious to know, just how expensive is it to use? Is it a one-time fee, a monthly subscription, or does it vary depending on usage? I'm interested in incorporating it into my business operations, but I need to know the financial implications before I make a decision. Could you provide me with some insight into the cost structure of ChatGPT and what I can expect to pay?