We are publishing the “short” version of BrainsMatch API documentation in this section of the Blog this week.
You can use the WordPress plugin which is destributed under GPL lisence to learn how to access the Engine through the HTTP.
You can modify the Plugin and create your own applications based on the current API. However we are formilizing the access policy to the Engine, meantime you can use it only to create WordPress based applications without requesting a special access.
In order to do so please drop us a comment here and we will contact you.
I would like to put your plugin on my blog.