Hello, I signed up and verified my email. But I didn’t get any test credits.
I get this error [607.283601] MUDEC_00049: No entry for SID 287. which according to the wiki is the one for ‘no credits’.
Sorry for this inconvenience… I’d set a trial credit now for your account. 
So I think you can use all mudfish nodes and features for a while. Please let me know if there are any problems or questions.