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But, I can't access to the current market price of those coins without sign-in, except for yoex coin (yoc/btc).
I hope we could easily access or at least see the trading features of altcoins without sign-in, through android as people will more interested to visit your site.
You can check the trade volumes and other stuffs without sign-in. Only the thing that you are not allowed to is trade until you sign up an account up there. Trade infos. without sign-in can be found out by visiting here:
https://yo-ex.com/markets/yocbtcThere is ATM only two altcoins on list YoCoin and YoGold