I'll first point out I'm a one in a thousand user and not a good representative of the users that will frequent your site - I have denied a few (I have deemed dodgy) sites that provide API services.

So for your site, imagine using google search bar, one is able to type in the query but when hitting the spy glass icon nothing happens. Nor does hitting the return key do a thing - but in your instance you have a text box so the return key just enters a new line in that box.

The behaviour of the launch icon [which I gather on your site would be the up arrow in a circular button] not working is not unique to your site, I experience this often enough, and no doubt I have blocked the host of one of the APIs used to build the gui instance to return the query data.