Nubits was one of the first cryptocurrencies pegged to USD. It has quite flexible mechanisms to maintain the peg, but it has fractional reserves (50% of NBT value in BTC the last time I checked ) and the last time I checked there was some internal division and the price of Nushares (a cryptocurrency that works like shares of the company, it is issued when the reserves are below the minimum and bought back when they are above ) was around 10 satoshis.