Betfair / Tradefair.

I've messed around with interest rates on Betfair before they moved off onto their own site. Definitely like their approach.

Tradefair binaries looks promising, although the spread's a nightmare at the moment. If you want to hold off a couple of weeks, I'll be dabbling once I get into their site (naturally, I'm being hit with technical issues. Welcome to my life).
 
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