Daily trading does not require a lot of capital unless you want to invest with many coins in a day. A capital of 500 usd is more than enough especially if your goal is to earn a lot money in a day but it is also risky to go all out in one coin. Investing in different cryptos can reduce the risk. In finding the right coin, you can the daily ranking of cryptos as well as their respective trading volumes and prices to help you decide.