How to Add Polygon Network to Metamask
2 Easy ways to add Polygon Network to your metamask

Automatically Add Network With PolyCUB.com

There are 2 extremely easy ways to add Polygon to your Metamask RPC settings. The first is to simply head over to https://polycub.com (once the UI is live). When you get there, PolyCUB.com will automatically prompt you to "Add Polygon As a Network" if you haven't added it already. If you have added it, then it will simply prompt you to switch to Polygon Network if you're not already on it.

Manually Add Network In Metamask Settings

1). Open Metamask and Go to Settings:
2). Go to "Network" and Click "Add Network"
3). Fill in the Following Settings:
Network Name: Polygon Mainnet
Chain ID: 137
Currency Symbol: MATIC
Explorer URL: https://polygonscan.com/
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Automatically Add Network With PolyCUB.com
Manually Add Network In Metamask Settings