Yes, Nest API is available.
You have to enable Nest API for your account thorough your broker. Only semi-automation is available for retail traders i.e. signals from AmiBroker will be logged to ‘Generated Orders’ window in Nest Trader, you have double click on each entry to place the order in OMS.
To enable fully-automation, you have to complete certain legal procedures that includes passing NISM exam, becoming Authorized Person on exchange etc.