The oddball of the crypto family began as a joke based on the "doge" meme in 2013. But as cryptos have broadly gained mainstream interest, dogecoin has emerged as an unexpected heavy hitter. It now has a market cap of more than $30 billion and it has surged more than 5,000% so far this year. And unlike its more popular brethren, a single dogecoin is still cheap — it hit an all-time high of about 45 cents in April. Whether or not its a smart investment remains an active question.