'''backtest
start: 2019-02-20 00:00:00
end: 2020-01-10 00:00:00
period: 1m
exchanges: [{"eid":"OKEX","currency":"BTC_USDT"},{"eid":"OKEX","currency":"ETH_USDT","stocks":30},{"eid":"OKEX","currency":"LTC_USDT","stocks":100}]
'''

import time
import json

params = {
    "arrBasePrice": [-1, -1, -1],     # -1