Introducing the coinmarketcap_lite gem

require 'json'
require 'ostruct'
require 'coinmarketcap_lite'


cl = CoinmarketcapLite.new(apikey: 'YOUR-API-KEY')

coins = JSON.parse(cl.coins.body)['data'].map {|x| OpenStruct.new x }

lines = coins.take(5).map do |coin|
  "%+15s %9.3f" % [coin.name, coin.quote['USD']['price']]
end

puts ([(' ' * 19) + 'USD', '-' * 27 ] + lines).join("\n")