Mobile App for personal portfolio in order to keep track of customers’ assets, view crypto coins\\\' rates with APIs from BEChallenge•Apples has updated its terms of conditions for private API’s use with apps regarding to crypto currencies especially. Therefore, the app shall use available API.•Due to security reasons, Exchange API key/secret pairs cannot be stored on Firebase for Backend to query coin value for Users. Exchange API key/secret pairs need to be encrypted in local database.•User\\\'s total coin values history.Solution•Client uses CCTX library to query (CCXT library is used to connect and trade with cryptocurrency/altcoin exchanges and payment processing services worldwide)•History graph gets data from firebase which is updated by backend crawler every hour according to user’s total holdings calculated from client.
