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Arbitrum
Native currency: Ethereum (ETH)
Arbitrum is an Ethereum Layer 2 network that uses optimistic rollups to reduce fees and increase transaction throughput while inheriting Ethereum's security. Launched in 2021 by Offchain Labs, it is one of the largest Layer 2 networks by total value locked and supports a broad ecosystem of DeFi, NFT, and gaming applications. It is fully EVM-compatible, allowing developers to deploy Solidity contracts without modifications.