Could be BitShares - BTS.

Why?

Among other reasons:

Market pegged assets: BitUSD, BitCNY, BitEURO, BitGOLD, BitSILVER, BitBTC. Avoid volatility, pay, accept familiar value assets.
Bullish with BTS? You can 'create' BitUSD and short it.

Under 10 sec confirmation time: Good start for a decentralized exchange with trading on the blockchain.

Developing efforts are closing on 1.0 client release (currently 0.6.2) which would see a
smooth user experience client and the supporting ecosystem (gateways, bridges etc).