First, log in to your MetaMask app and click the three lines in your top left corner
Then as you expand the menu, go to "Settings".
In Settings, go to Networks
Click "Add Network"
After you’ve done that you will reach the network settings page and the fields should be populated with the following credentials
Network Name: Polygon Mainnet New RPC URL: https://polygon-rpc.com/ Chain ID: 137 Currency Symbol: MATIC Block Explorer URL: https://polygonscan.com
Click "Add" and go back to the homepage and will look like this:
Congratulations! You have now successfully connected the Polygon Network in your Web3-wallet. You just need to add some MATIC tokens and then you're ready to transact!
At any given time you can switch between the Ethereum Mainnet or Polygon, just click the dropdown-list and you can toggle between the different networks.
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