>Do is includes a block explorer too ?
It doesn't include blockchain explorer, just reading from already available blockchain explorers.
>Is there a way to scan the addresses ?
What do you mean by scanning an address? The app just gets the current balance of the addresses from blockchains.
>How are you calculating the portfolio value ? Taking averages ?
After getting the balances of the addresses, It reads the prices of the given cryptocurrency from coinmarketcap's api and calculate the value of the address like this: address value = address balance x cryptocoin value (in usd and btc). Then summing up together all the address values to get the total portfolio value in both USD and BTC.
>What's the purpose of the project ?
I just wanted this simple thing to get all the current data from publicly available API-s and calculate all the values. I saw somewhat similar services, but you would had to introduce the balances, prices and eventual changes in both manually. This app do it automatically.