If you don’t have MATIC, use methods 2 and 3. You can also get some MATIC here.
Then swap MATIC to WETH using various channels.
- Open Metamask and choose Swap
- Select ETH from the dropdown list.
- Enter the amount to swap
- Review then Swap.
- Make sure your Metamask is connected to the Polygon network
- Choose the pair MATIC and WETH
- Enter the amount then Swap
You'll need to have ETH on Ethereum Mainnet.