Can i publish my algo trade app , so that any public people can use it by entering there credential in to my system.

File "D:\halftrend\venv\Lib\site-packages\SmartApi\smartConnect.py", line 291, in placeOrder
orderResponse= self._postRequest("api.order.place", params)['data']['orderid']
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
TypeError: 'NoneType' object is not subscriptable

I want to fetch the closest market strike rate of nifty using smartapi in python. please send sample code .