How much does 1 key cost?

Could you please elaborate on the context of this question? Are you referring to a specific cryptocurrency or blockchain project where "keys" are used as a form of currency or access? In general, the cost of a "key" would depend on various factors such as its scarcity, demand, and the market conditions at the time of purchase. If you're referring to a specific project, it would be helpful to know the name of the project and any additional details that might impact the value of the key. Additionally, it's important to note that the price of cryptocurrencies and blockchain-based assets can be highly volatile and can change rapidly, so the cost of a key at any given time may differ significantly from what it was in the past.