According to the response.headers (that you did not provide, but that are easily recoverable by running your code), the response is encoded using Brotli compression (Content-Encoding': 'br'). You can decompress it with brotlipy:
import brotli
brotli.decompress(response.content)
#b'{"status":"success","data":[{"placed_by":"XE4670","order_id":"180331000000385",
#"exchange_order_id":null,"parent_order_id":null,"status":"REJECTED",
#"status_message":"ADAPTER is down","order_timestamp":"2018-03-31 07:59:42",
#"exchange_update_timestamp":null,...}
Now, it’s JSON, as promised ('Content-Type': 'application/json').