Bitpayer is a decentralized trading platform that lets you trade Ethereum and Ethereum-based tokens directly with other users. It is the first digital assets decentralised exchange that shares profits with all users.
ARPA is a Secure Computation Network Compatible With Blockchains They propose a blockchain-based secure computation network of Multi-party Computation (MPC). ARPA cryptographically enables private smart contract, unprecedented data-at-use privacy protection, as well as scalable computational sharding.