Please note: withdrawing funds from Polygon/Matic to the Ethereum mainnet is a two-stage process that may take up to 4 hours to complete.
You'll also need enough ETH (mainnet) in your wallet to cover withdrawal from the Matic network.
Withdrawing funds from Polygon/Matic
To get started, head to the wallet icon, located on the top-right of the OpenSea website. For this tutorial, we'll be withdrawing ETH from Polygon/Matic (represented by a purple diamond logo).
Clicking on the right side of ETH (Matic) will prompt a "Bridge to Ethereum" button. Clicking this will redirect you to https://wallet.matic.network/ for the next part of the withdrawal process.
You'll be taken to your Polygon (Matic) wallet dashboard, which will show all assets bridged to Matic.
Locate the Ether (PoS-WETH) asset, this is the same as ETH (Matic) on OpenSea. Click "Withdraw to Ethereum".
A pop-up window will ask you to enter your desired withdrawal amount. Once you're done, click "Transfer" at the bottom.
You'll have to press continue on three pop-up windows after. You will confirm the transaction fee and that the withdrawal process may take up to 4 hours to complete.
You'll be asked to sign the transaction on wallet.matic.network (seen above on MetaMask). The gas amount will be low.
The first part of the withdrawal process will take approximately 45 mins to 1 hour. This will move funds to a checkpoint on the Ethereum network.
You can return to the window later on to complete the checkpoint. You will see a "Action Required" notification on the top right of the window.
Once the funds arrive at the checkpoint, you'll be prompted again with a notification in the top-right corner to sign the transaction on Ethereum (seen below on MetaMask).
This will initiate the second part of the withdrawal process, and may take up to 3 hours to complete.
Check back again in three hours. If the progress bar seems stuck, its safe to refresh the browser window.
After that time, your withdrawal should be complete. You can click the "View on Etherscan" to see the transaction details on Etherscan.io.