Like in the title in this section of platform of OpenAI website in the link below
https://platform.openai.com/usage
It shows that the limit of using the API is 5 USD, and to increase it is showing that I need to be on the paid tier. What does this paid tier mean? Do I need to pay for chatgpt plus and also pay for the api usage to get access to modify my api usage which is as per the token count. I am a little confused because there are so many factors as how the pricing is occurring. I need to know if there is way to simplify and understand everything in one go. That will also be helpful because I need a reference for pricing that I understood properly so I don’t get surprised when I see my billing.