Startup Idea: Online Cryptocurrency Portfolio with Real-Time Tracking and Exchange Features

Startup idea to develop an online cryptocurrency portfolio platform that allows users to track real-time prices of major currencies, act as a cryptocurrency wallet, and provide p2p exchange for various currencies.

I would really be able to use an online cryptocurrency portfolio that allows me to track the prices of all major currencies in real time. It would also be a huge bonus for that portfolio to be able to be able to act as a cryptocurrency wallet or even as an exchange that would allow sells and purchases for different currencies in a p2p fashion.