There is no such statistics on CoinMarketCap. Here, for example, their 19: https://cryptoslate.com/cryptos/stablecoin/ And the price of a normal stablecoin should be about $ 1.
Really there are 19? I thought that I know every stable coin. Soon to this list will be added QUSD (CoinTiger), USDX, DiamCoin and possibly XAUp?