As the markets price in the next interest rate hike by the Federal Reserve, we see the spread between the 30 year and 2 year US treasuries continue to flatten. It is probably not coincidence that peaks in the Altcoin Index match up with with relative bottoms (especially recently) in the treasury spread.
Also, although this is somewhat due to the Segwit2x drama this weekend, observe how the Altcoin Index has really skyrocketed over the past couple days. This may indicate some cryptocurrency adoption from 'smart money', though many establishment figureheads have publicly rebuked cryptos.
If you're interested in the Kovach Altcoin Index or the Crypto Spread Indicator, among other tools, please check out quantguy.net