You should charge more! That is low enough it's in the "Why so cheap?" range which may even hurt your chances of finding work than being too expensive! If you have any work experience at all, double or triple that rate.
>>EddieJ+(OP)
I agree, $15/hr should be the rate for the 'few hours of "exploratory" work' they're offering, and at least 2-4X that beyond the introductory period. It's an insane deal to anyone for the stack they claim to work with.