Tradingview added crypto "total market cap" and "altcoin market cap" data. Now, you can chart it. Ticker: TOTAL
https://www.tradingview.com/x/GfyRIcJe/
https://www.tradingview.com/x/GfyRIcJe/
https://www.tradingview.com/x/GfyRIcJe/
https://www.tradingview.com/x/GfyRIcJe/