What is Loopring ?
Loopring is an open protocol for scalable non-custodial exchanges on Ethereum. For developers, Loopring is an open protocol with a set of open source tools for building high-performance, non-custodial, order-book-based decentralized exchanges on Ethereum using the layer two solution: zkRollup. For ordinary users, you might be more familiar with the Loopring Exchange (Loopring.io), the first Ethereum based high-throughput DEX built on Loopring 3.0 with TPS up to 2,000. The first time you use it, it might take 5-30 mins to create a layer two account for you. For professional traders, you can now use its API in your existing trading-bots to arbitrage between CEXs and DEXs. Loopring has issued the LRC token. You can stake LRC to get your trading fee discount plus a share from others' trading fee as well. Loopring was upgrade to V3 in 2019. The [source code](https://github.com/Loopring/protocols/tree/master/packages/loopring_v3/contracts) of Loopring V3 has been [audited](https://medium.com/loopring-protocol/secbit-delivers-a-security-audit-report-for-loopring-protocol-3-0-a768c2bd061a) by [SECBIT](https://secbit.io/).