What is FEI cost?

Excuse me, could you please clarify what you mean by "FEI cost"? Are you referring to the price or value of the FEI stablecoin in the cryptocurrency market? If so, the cost of FEI can vary depending on market conditions and supply and demand dynamics. It's important to note that the value of any cryptocurrency, including FEI, can be volatile and fluctuate significantly over time. Therefore, it's always a good idea to do your own research and stay informed about the latest market trends before investing in any cryptocurrency.