The platform has scheduled a maintenance to the KuMEX sandbox trading system between 02:00 to 06:00 on February 4, 2020 (UTC+8). By the time, all the historical data will be cleared. If you need the data, please download them in time before the maintenance starts.

The maintenance is conducted only to the KuMEX sandbox system and will not affect the normal usage of KuMEX.

See the official announcement here:

➔ Visit Kucoin now and start trading