$CBOE Volatility S&P 500 Index (.VIX.US)$ how to buy?

Flaxfield : It's an index, like the S&P OR NASDAQ. You can't buy an index.

U0304380 : you can ETF that follows VIX, e.g. VXX, VIXY, but liquidity is a known issue

Sigma1 : Same question,

I bought TVIXF, I don't know how to do it with VIX