Course Content
How to Use the Polygon Bridge?
The Polygon Bridge allows users to quickly transfer ERC tokens and NFTs to the Polygon sidechain. There are primarily two bridges on Polygon, the Proof of Stake (PoS) Bridge and the Plasma Bridge. Both can bridge assets from Ethereum to Polygon (and vice versa), but they adopt different security methods. The PoS Bridge uses the Proof of Stake (PoS) consensus algorithm to secure its network. It supports the transfer of Ether (ETH) and most ERC tokens. It’s the recommended option for most users. The Plasma Bridge is for devs that need increased security. It uses the Ethereum Plasma scaling solution and supports the transfer of MATIC, ETH, ERC-20, and ERC-721 tokens.
How to Use the Polygon Bridge?
About Lesson
To bridge tokens from Ethereum to Polygon, you need a compatible cryptocurrency wallet, such as MetaMask. If you don’t have a MetaMask wallet, follow the steps in this tutorial to create one. You’ll also need to download and install the MetaMask browser extension.
1. Log in to the Polygon Web Wallet by clicking [Polygon Bridge].

2. Next, you need to connect your crypto wallet. In this example, we will use Metamask.

3. You’ll be asked to sign a message to connect your MetaMask wallet to your Polygon wallet. This signature won’t cost any fees. Double-check the URL to make sure you are on the correct website and click [Sign] to proceed.

4. You should be redirected to the Polygon Bridge interface. If not, click [Bridge] on the left menu bar.

5. To send your tokens from the Ethereum mainnet to Polygon, go to the [Deposit] tab. Click on the token name to choose the token to bridge. In this example, we’ll use ether (ETH). Enter the amount and click [Transfer].

6. Read the important notes and click [Continue] when you are ready.

7. You’ll also see the estimated gas fee for this transaction. If you are ok with the gas costs, click [Continue] to proceed.

8. Review your transaction details, including the token amount and the estimated transaction fee, before clicking [Continue].

Note that the PoS bridge is secured by validators. If you decide to move funds back to the Ethereum network, it can take up to 3 hours.

9. You’ll then be prompted to sign and approve the transfer in your MetaMask wallet. Check if the details are correct and click [Confirm].

10. Once confirmed, wait for the tokens to arrive in your Polygon wallet. You may click [View on Etherscan] to check the transaction status.

Exercise Files
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