Guide to add Polygon (Matic Network) Network on Metamask (Desktop & Mobile)
Connect Your MetaMask With Polygon Network

1) Go to the settings page
2) Click on Networks > Add Network
3) Key in the relevant details:
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Matic Mainnet
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Network Name: Matic Mainnet
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New RPC URL: https://rpc-mainnet.maticvigil.com/
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ChainID: 137
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Symbol: MATIC
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Block Explorer URL: https://explorer.matic.network/
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In times of congested networks, sometimes changing the RPC url helps out: