This Technical Tuesday, Kevin Horner takes a look at the S&P 500, which he says is trading between its 50-day moving average and 6,500 and could test those levels soon. He also looks at MicroStrategy (MSTR), which he calls a bitcoin proxy, and says the chart is set up for a bull flag. Lastly, he charts Coinbase (COIN), which he says might be showing an ascending triangle.