get https://api.shasta.trongrid.io/wallet/getenergyprices
查询历史能量单价
返回值
prices - string ：所有历史能量单价信息。每次单价变动以逗号分隔，冒号前为毫秒时间戳，冒号后为以sun为单位的能量单价。
Click
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