Polygon Bridge

Polygon Bridge connects Ethereum and Polygon PoS by moving an asset's usable representation between chains; the official PoS bridge locks the source asset in escrow contracts on Ethereum and issues the mapped representation on Polygon, while third-party routes use different liquidity, relayer, or message-validation designs.

The native route works without market liquidity and supports ERC-20, ERC-721, and ERC-1155 assets; native POL deposits arrive as native POL. The ERC-20 token standard explains the transfer and approval interface used by fungible tokens. The PoS bridge connects Ethereum and Polygon PoS only; it does not bridge directly to Polygon zkEVM.

Bridging works by selecting the source network, Polygon PoS as destination, asset, amount, and recipient, reading the route and estimated costs, and submitting the route's transactions from a self-custody wallet. On the official route, a deposit locks the asset on Ethereum and mints its mapped token on Polygon; a withdrawal burns the Polygon representation, waits for a validator checkpoint to land on Ethereum, and then uses a separate claim transaction on Ethereum to unlock the escrowed asset.

An approval is a separate permission for the bridge contract to move a token on your behalf. That lock-and-mint or burn-and-claim pattern is the native case of the broader blockchain bridge model; third-party routes may instead use liquidity pools, relayers, or their own message validation.

Depositing from Ethereum to Polygon usually takes minutes after the Ethereum transaction receives its required confirmations and the bridge processes it. The deposit and any token approval use ETH on Ethereum; once the mapped asset arrives, actions on Polygon use POL for gas. That gives the deposit direction a two-chain funding path: ETH for the source-side transaction and POL for the destination-side transaction.

Withdrawing from Polygon to Ethereum is a three-stage flow: burn the Polygon representation, wait for a Polygon validator checkpoint, then submit a separate claim transaction on Ethereum to release the escrowed asset. Checkpoints normally arrive roughly every 30 minutes; after the checkpoint is included, the claim uses ETH gas, and total time also depends on congestion and how quickly the claim is submitted. The official bridging guide shows the claim flow. The withdrawal is tracked by its burn transaction, so a second burn is not a new step in the same withdrawal.

Bridging costs are network gas plus any fee built into the selected route's quote. You pay ETH on Ethereum for approvals, deposits, and withdrawal claims, and POL on Polygon for burns and general use; Ethereum gas changes with congestion, so the same deposit can cost different amounts at different times. The official PoS bridge charges no protocol cut on top of gas, while third-party bridges typically add a provider or liquidity fee to the quoted receive amount. Timing follows the same split: deposits are usually minutes, while withdrawals follow the checkpoint cycle and then the claim.

Polygon Bridge carries smart-contract, validator and checkpoint, upgrade-governance, network, and user-error risk. The PoS bridge uses upgradeable contracts governed through multisignature controls, and its contracts escrow assets while mapped representations circulate on Polygon; confirmed bridge transactions cannot be reversed. Fake bridge domains are a standard phishing play, so before signing verify the domain, source and destination networks, token contract, approval scope, and recipient address; treat ads or DMs offering bridge “support” as phishing until proven otherwise. If an approval was granted to the wrong contract, use a known-good tool to revoke it; MetaMask's guide to revoking token approvals explains that separate permission step.

Bridging problems are usually a network mismatch, missing destination gas, or a withdrawal that has not reached its claim stage. Wrong network: if the wallet is on Ethereum while the interface expects Polygon (chain ID 137), or the reverse, switch networks and reload. No destination gas: if the asset arrived but there is no POL to move it, fund the Polygon wallet before the next transaction. Pending withdrawal: if the burn is complete but the checkpoint has not landed, or the Ethereum claim is still unsubmitted, check the withdrawal status and submit the claim.