No Close Price in CryptoEnv

The code below does not contain any information about the crypto pair price in CryptoEnv class at all. Is there any reason for that?
In StockTradingEnv it does.

```
def get_state(self):
state = np.hstack((self.cash * 2 ** -18, self.stocks * 2 ** -3))
for i in range(self.lookback):
tech_i = self.tech_array[self.time-i]
normalized_tech_i = tech_i * 2 ** -15
state = np.hstack((state, normalized_tech_i)).astype(np.float32)
return state

```