xcoinx.com is a cryptocurrency exchange, where you can track the OneCoin development in figures. At present, OneCoin ranks number two in terms of market capitalization among all global cryptocurrencies.
You cannot find OneCoin on coinmarket or other exchanges for several reasons.
First, OneCoin is a young cryptocurrency, currently not open for trading to everyone.
Second, only the OneLife Network can mine and trade the coin on the OneCoin Exchange.
Third, all websites listing cryptocurrencies are private websites, meaning that it is up to their owners to decide which currencies to list or not.