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主要做币安合约，看了本站API文档，exchange.GetTicker()没提到是多久更新一次，实际调试发现相隔几百毫秒的两次查询，价格和成交量经常都没变化，感觉差不多1秒多才更新一次，这就不合适做高频了。
所以做高频合约用哪个接口比较合适？websocket吗？WS更新周期是多久？
另外exchange.GetTicker()获取的成交量也没提是多长周期内的，最近24H的吗？
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