What is Thales? Thales is a binary options trading protocol on Ethereum. Born out of the Synthetix ecosystem, it leverages Chainlink provided price feeds, 0x limit order books, and the sUSD stablecoin to provide users a novel on-chain, permissionless and non-custodial way to hedge and speculate on the prices of crypto assets, commodities, equities, equity indices, sports markets, and proprietary crypto indices.