title: How to calculator the ROI of Masternode
body: <p>I will show the Roi of each masternodes.
  I used the <a href="https://coinmarketcap.com/api/" rel="nofollow noreferrer">API</a> provided from <a href="https://coinmarketcap.com" rel="nofollow noreferrer">coinmarketcap.com</a>.
  Many API provides the info such as price and market cap as well.
  But it seems that it doesn't support the ROI.
  How can I get the value?</p>