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Layer-2 solutions like Arbitrum are quickly gaining favor throughout the blockchain community by minimizing congestion on blockchains like Ethereum and providing low-cost access to a wealth of decentralized finance (DeFi) protocols. When interacting with DeFi platforms on Arbitrum, you’ll likely be using a Web3 wallet such as MetaMask. However, to do so, you’ll need to know how to add Arbitrum to MetaMask.