Speaking of Ethereum, here’s Etheropt, an Ethereum powered options exchange

Etheropt is a decentralized options exchange built on Ethereum. The options you see here are binary call options on the price of Ethereum in USD as reported by Poloniex and Coindesk and verified by Reality Keys. Etheropt has no owner. Its entire operation is described and executed by an Ethereum smart contract.

http://etherboost.github.io/etheropt/testnet?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+feedsapi%2FBwPx+%28Hacker+News+Top+20+Full+feeds+by+FeedsAPI%29