How to Use the Polygon Bridge?
The Polygon Bridge is a two-way system for transferring supported assets between Ethereum and Polygon PoS using the Polygon Portal. The process requires a self-custody EVM wallet, a supported mapped token, the correct source network, and native gas assets (ETH for Ethereum and POL for Polygon). Using the bridge involves opening the official Portal, selecting networks and tokens, reviewing routes and approvals, and submitting source transactions. Withdrawals from Polygon to Ethereum additionally require a claim transaction on Ethereum to release the assets. Users must avoid common mistakes such as network confusion, insufficient gas, and phishing scams by relying solely on official portals and transaction hashes.
The Polygon Bridge is a two-way system for moving supported assets between Ethereum and Polygon PoS. Through Polygon Portal, a deposit locks an asset on Ethereum and makes its mapped representation available on Polygon, while a withdrawal burns or exits the Polygon-side representation so the corresponding asset can be released on Ethereum.
To use the Polygon Bridge, open the official Polygon Portal, select the correct source and destination networks, choose a supported token, verify its mapping and the quoted route, then approve and submit the required wallet transactions. Keep native gas on the source chain and follow the Portal status until any required destination-side claim is complete.
What Do You Need Before You Use the Polygon Bridge?
Prepare the wallet, mapped token, correct network, and gas assets before opening Polygon Portal. Each item determines whether the bridge can start and finish without leaving funds at an incomplete withdrawal stage.
- A self-custody EVM wallet. Use the same address throughout the transfer because Polygon Portal connects the deposit, withdrawal, and claim stages to the signing wallet.
- A supported mapped token. Confirm the token in Polygon Portal or Polygon's official mapped-token list because a matching ticker does not prove that the native bridge supports its contract.
- The correct source network. Choose Ethereum or Polygon PoS explicitly. Polygon zkEVM and third-party networks use different contracts and cannot be treated as the same bridge route.
- Enough ETH or POL for gas. Keep ETH for Ethereum transactions and POL for Polygon transactions. A Polygon-to-Ethereum withdrawal needs POL to start and ETH to complete the claim.
How to Use the Polygon Bridge: A Step-by-Step Guide
The buttons can change, but the route, contract, approval, and completion checks remain essential. Use a small test transfer when the token mapping or withdrawal path is unfamiliar.
Step 1: Open the official Polygon Portal. Reach portal.polygon.technology through Polygon's current documentation, connect the intended self-custody wallet, and verify the displayed account. A sponsored search result or look-alike bridge can request approvals that send assets to an unrelated spender.
Step 2: Choose the direction and mapped token. Set Ethereum and Polygon PoS in the required direction, then select the supported asset and confirm its destination contract. Polygon PoS, Polygon zkEVM, and third-party networks are separate routes even when their names or wallet icons look similar.
Step 3: Review the route and token approval. Keep enough native currency for gas, inspect the estimated output, and identify whether Portal selected the native bridge or a third-party provider. If an ERC-20 approval is required, confirm the spender and limit the allowance when that option is available.
Step 4: Submit and track the source transaction. Sign the actual bridge transaction after any approval confirms, save its transaction hash, and follow it in Portal and the source-chain explorer. Repeatedly pressing submit can create a second transfer rather than speed up the first one.
Step 5: Complete the destination-side action. For a withdrawal, return through the official Portal when the Ethereum claim becomes available and reserve ETH for that transaction. Confirm the destination balance and mapped token contract in an explorer before treating the bridge transfer as complete.
How Much Does It Cost to Use the Polygon Bridge?
An Ethereum-to-Polygon deposit requires ETH for the Ethereum transaction, while a Polygon-to-Ethereum withdrawal requires POL for the Polygon transaction and ETH for the final Ethereum claim. An ERC-20 deposit may also require a separate Ethereum approval transaction before the bridge transaction.
Polygon does not publish one fixed gas amount because the wallet calculates gas from current network conditions. The official withdrawal instructions require users to keep POL for the first transaction and ETH for Claim Tokens. If Portal selects a third-party route, use that provider's complete quote because its fees and settlement model differ from the native bridge.
What Common Mistakes Should Polygon Bridge Users Avoid?
The most common mistake is network confusion: Polygon PoS and Polygon zkEVM are not interchangeable. Other failures include spending the gas needed for the next stage, approving an unexpected spender, importing an unverified destination token, sending directly to a bridge contract, or assuming a confirmed source transaction means a withdrawal has finished.
If a transaction fails or appears delayed, inspect its explorer status and Portal stage before trying again. Do not copy a contract or support address from a direct message. Legitimate troubleshooting uses public transaction hashes and addresses; it never requires a seed phrase or private key.
Why Does a Polygon-to-Ethereum Withdrawal Require a Claim Transaction?
The claim transaction unlocks the Ethereum tokens after the mapped tokens have been burned on Polygon and the withdrawal has been processed. The first transaction starts the withdrawal on Polygon; it does not deliver the Ethereum assets to the wallet.
Open the Transactions tab in Polygon Portal and wait for Claim Tokens to appear. Then reconnect the same wallet, switch to Ethereum, and pay the claim transaction with ETH. The withdrawal is complete only after the Ethereum explorer shows that transaction as successful.
Which Tokens Can You Transfer Through the Polygon Bridge?
You can transfer tokens that have an approved mapping between Ethereum and Polygon PoS. Check the current Polygon token list or the token selector in Polygon Portal before depositing. A matching ticker or logo does not prove that an independently issued token uses the official mapped contract.
A project launching a new ERC-20, ERC-721, or ERC-1155 token must submit a mapping request before the native bridge can support it. Polygon states that review generally takes up to seven days. The request identifies the Ethereum root contract, network, and token standard. For an existing token, record both contract addresses, check the amount and decimals, and confirm the received asset on the destination explorer before using it in another application or approving it for a swap transaction.
Related Concepts
Further Reading
FAQ
How long does the Polygon bridge take to transfer the fund?
Timing depends on direction, network confirmations, and the selected route. Deposits to Polygon PoS and withdrawals to Ethereum do not use identical processing stages. Treat the estimate shown in the official Portal as more reliable than a fixed time quoted elsewhere.
Why is my bridged token not visible?
Can you cancel a Polygon bridge transaction?
Is Polygon Portal the same as a third-party bridge?
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