Yes for most you don't even have to have an account just to watch or check prices. Here's a page on Bittrex that shows current trading for LTC.

https://bittrex.com/Market/Index?MarketName=USDT-LTC

You can also view say Coinbases charts here...

https://www.coinbase.com/charts

And can really jump across all exchanges, poloniex, cracken, etc, etc, etc and see if you can find some opportunities.