It's a valid question to ask, "How much USD is currently invested in cryptocurrency?" The answer, however, fluctuates constantly as the
market values of various cryptocurrencies change daily. At any given moment, the total market capitalization of all cryptocurrencies can provide a rough estimate of how much USD is invested in the crypto space. But it's important to remember that this figure only represents the current market value and not necessarily the actual amount of USD that has been invested or traded in cryptocurrencies. Additionally, the majority of cryptocurrency trading occurs on exchanges where the value is denominated in USD or other fiat currencies, so the actual amount of USD involved can be difficult to pinpoint accurately.