Thank guys, it is really help me out. Seems not to request any minimum post quantity per week and coinlib.io not a good exchange for Muncoin at the moment.
Let's go to coinexchange.io.
Recently, lots of masternode-supported coins launched and listed on Stock.exchange, south.exchange and BTC-alpha. I don't know whether those ones are secured and stable for trading or not, but personally coinexchange.io, which is more traditional one, is likely better option. I have traded in the exchange without problem.
Yes, south.exchange is the pretty good one. But we shall focus on only one exchange to raise the daily trading volume. I support Dev choose the exchange with low fee of listing. Let's wait for the good news from Dev.