Tether and Hermez announced mutual support in January to address the problem of historic Ethereum transaction fees.
The round was joined by a host of cryptocurrency projects that are considering adding zkSync, including Coinbase, Aave and Curve Finance.
The rollup platform from Offchain Labs is going live this week, with over 150 projects having requested early access.
A potential fix for Ethereum's costly congestion problems.
A majority of the top Ethereum-based decentralized applications (dapps) are switching to rollups, a layer 2 for increasing throughput.