I've tried to contact
info@tradehill.com but this is an automic address who transform your email into some ticket on
https://tradehill.zendesk.com which means I doubt there will be any reply (but maybe, it just takes really long for them to do so).
Anyway, I'm sad to see TradeHill disappearing.
PS: thanks, I've changed my signature.
He's partnered with Jonathan Ryan Owens on a new project so you might be able to reach him through that.