Despite its recent woes, the cryptocurrency market isn't going to fade away; it will likely come under regulation and grow as adoption becomes widespread and scam coins are rooted out, though there probably won't be any more outrageous bubbles like that of December/January of 2017/2018. If you are a crypto investor or plan to put some money into the space, you will want to watch prices just as you would with any stock you own.
You can add SILVER to your iPhone's stocks application using the following symbol:
You can add GOLD to your iPhone's stocks application using the following symbol:
Several users have asked both here at iPhoneFAQ and on a variety of discussion forums how to add NASDAQ and the S&P 500 indexes to their iPhone's stock widget. The Dow Jones Industrial average is included on the iPhone by default using the symbol ^DJI.
You can add the NASDAQ and S&P 500 using the following symbols: