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I don't think you owe him $500.00. Especially since that would be the majority of your post reward. I recommend just giving him a generous tip.

I don't have that much to give yet anyway, but I'll find someway to repay him..
And while I really appreciate the inspiration, this thing is evolving so fast that the v2 code I'm working on is already unrecognizable ..

Whenever I feel guilty about building on somebody elses work I remind myself that Everything is a remix , and we're all building on the shoulders of giants. This wouldn't have happened without @roelandp 's steemstream , which couldn't happen with @pharesim 's steemjs, which was built using @xeroc 's piston .. Same goes for jquery, highscharts etc