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Sign In to the MetaMask Wallet
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Click on the “Settings” menu
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In the Setting click on “Network”
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Once the Network tab is opened click on “Add Network”
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In the tab opened provide the following details
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For Polygon Mainnet
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For Polygon Testnet
Network Name: Polygon Mainnet
New RPC URL: https://rpc-mainnet.maticvigil.com/
ChainID: 137
Symbol: MATIC
Block Explorer URL: Polygon (MATIC) Blockchain Explorer
Network Name: Mumbai TestNet
New RPC URL: https://rpc-mumbai.maticvigil.com/
ChainID: 80001
Symbol: MATIC
Block Explorer URL: TESTNET Polygon (MATIC) Blockchain Explorer