Have you found out a trades channel? I tried trade, trades, trade.btcusd and trades.btcusd to no avail.
Yeah, it's working, tried it just now:
> ["websocket_rails.subscribe", {"data":{"channel": "trade.btcusd" }}]
< text: [["websocket_rails.channel_token",{"id":null,"channel":"trade.btcusd","user_id":null,"data":{"token":"fa1222b8-0e2f-4e8b-bcbb-165ea6d40d35"},"success":null,"result":null,"token":null,"server_token":null}]]
< text: [["websocket_rails.subscribe",{"id":null,"channel":null,"user_id":null,"data":null,"success":true,"result":null,"token":null,"server_token":null}]]
< text: [["trade.new",{"id":null,"channel":"trade.btcusd","user_id":null,"data":{"pair":"BTCUSD","price":"235.4","amount":"4.81834136","side":1,"timestamp":"1429709841.026109114"},"success":null,"result":null,"token":"fa1222b8-0e2f-4e8b-bcbb-165ea6d40d35","server_token":"MsoF3fiWaVg1YKThhtQ48g"}]]
< text: [["trade.new",{"id":null,"channel":"trade.btcusd","user_id":null,"data":{"pair":"BTCUSD","price":"235.4","amount":"0.18165864","side":1,"timestamp":"1429709841.114709611"},"success":null,"result":null,"token":"fa1222b8-0e2f-4e8b-bcbb-165ea6d40d35","server_token":"MsoF3fiWaVg1YKThhtQ48g"}]]