When purchasing any digital currency on a platform such as Binance or any other platform, you can use some indicators and data available on the platform to evaluate the currency and make an appropriate purchasing decision. Here are some important indicators you can consider:

1. Trading Volume: refers to the number of currencies that were bought and sold during a specific period of time. High trading volume indicates high interest from investors and may be a positive signal.

2. Liquidity: Refers to the ability of a currency to be converted into liquid money. Currencies with high liquidity can be easily bought and sold at reasonable prices.

3. Market Cap: Reflects the total value of the coin based on the current price and circulating supply. Coins with a higher market cap are usually more stable and may be a good investment.

4. Price Change: It reflects the percentage change in the price of the currency during a specific period of time. This indicator can be used to evaluate the short-term performance of a currency.

5. News and Analysis: You can view the news and analyzes available on the platform or on other websites to understand current events and market expectations regarding the currency.

Remember, it is best to gather information from multiple sources and evaluate it based on your own investment strategy. It is also always recommended to invest in popular, reliable currencies that have a good reputation.