I have an update for you. When you have a spare moment, stop your explorer, do a git pull and restart the explorer. I added better support for USD price lookups of any altcoin, so your ETH and USDT pairs should now return proper values. Please keep in mind that for now it only displays the USD value for the default exchange trading pair (as it always did), and not an average of all markets. I plan to add the average market price as an option in the near future, but hopefully this will suffice for now.