Run the code above at https://www.fmz.cn/bbs-topic/865 to test it.
Confirm that the API key and the exchange are set up.
Did you delete the key, re-generate the new key, or something like that?
Inventors quantify - small dreamsIt is recommended to use private hosts, public hosts are generally used for beginners to practice the simulator. If you still have problems accessing BITMEX with a private host, you can get help at FMZ's official QQ group @Kicholo Dream.