How much mana is equal to 1 USD?

Could you please elaborate on the relationship between mana and USD? I'm particularly interested in understanding the exchange rate. Could you tell me how much mana corresponds to 1 USD? Is there a fixed conversion rate, or does it fluctuate? If it does fluctuate, what factors affect its volatility? Additionally, how do I go about converting my USD to mana, and vice versa? Is there a specific platform or exchange that facilitates these transactions? Thank you for your assistance in clarifying this matter.