There are plans and first steps to build such an API. Take a look at the Servent class.
If you build one, we would be very interested to integrate it. I can also give you access to commit your changes directly into Subversion, if you like to.

Gregor

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I have managed to create a small class in my project that starts phex.
Well, I just copied and pasted phex.Main and compiled it against phex.jar.

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Regarding a complete API, I can create an interface and propose it to you.

Then of course it would be helpful to have some hints from you as to how various functions should be implemented.