In a tweet on it official handle, it says We are upgrading the database and other important updates. There will be a completely new PCM user experience by the end of this month. Please pay attention to our Twitter announcement about the time of barter opening.
PichainMall is the first active barter app on the Pi ecosystem which focus on providing barter services for Pioneers of Pi Network around the world. Apart from mining, you can earn Pi on their platform through selling.