I contacted Bittrex today for listing PHS .

Here's the answer:

Thanks for contacting us about your coin. We look for coins that have high community demand, innovations to cryto-coin technology, or a contribution to science or humanity. Given the demand for coin launches, we limit ourselves to only a handful a week. Launching is free and at our discretion. If you'd like to guarantee the launch of your coin and get additional marketing in our platform, we offer the option to spotlight your coin for 2.0 BTC.