The Coin Detail skill is a quick and easy way to get information about bitcoin, litecoin, ethereum, bitcoin cash, ripple, dash, and monero. You can ask for the price, market cap, percent change, or volume for any of those cryptocurrencies.
This skill uses https://coinmarketcap.com/ for up to date information on these different coins across many different exchanges.
“Alexa, ask Coin Detail what the market cap of ethereum is”