Currently they get their price by averaging out the price on several centralized exchanges and using that.

However, on Reto, right now there are an average of 35 trades per day. Once that number rises significantly, you could very well turn off the feeds from the centralized exchanges and just depend on arbitrage to fix the prices properly.

At an average of 35 trades per day, that's one trade on average every 40 minutes. That number would definitely need to come down first, but I think that will occur over time.