At the moment APIs that enable you to place orders aren’t on our roadmap. We do have an #ideas for read-only APIs here [Feature Request 🔧] APIs for Accessing User Portfolio. So it’d be great if you could create another topic for an API with this type of functionality, as you’ll be using it for a different purpose 
I should mention that we’re building a service for long term investors, rather than day traders though so we may struggle to provide something that suits your needs if it’s the latter that you’re looking to do 