Cross-chain · Ethereum → Polygon

Swap WETH from Ethereum to POL on Polygon

Swap WETH from Ethereum to POL on Polygon. Wallets that need native POL spend wrapped ETH on Ethereum and receive the chain 137 gas coin.

You approve WETH at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 on Etherscan. You receive native POL, marked 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, which Polygonscan shows as the gas balance of chain id 137. Unwrapping WETH would have given you native ETH on Ethereum instead, and that ETH does not pay Polygon fees. Mainnet blocks are about 12 seconds. Polygon blocks are about 2 seconds. Switch to chain id 137 and read the native gas line on Polygonscan after the route.

Diagram for Swap WETH from Ethereum to POL on Polygon
WETH leaves Ethereum. POL is what can arrive on Polygon.

The output is gas, not another wrapper

0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE on this route means POL. Once the wallet is on chain id 137, the native line should increase. If you imported the placeholder as a custom token, delete that row and read Polygonscan. The WETH you spent will not appear there. Some wallets still label this balance MATIC.

Approve wrapped ETH, pay native ETH

The contract that decreases is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2. The fee on chain id 1 is ETH. A wallet with WETH and no ETH cannot start. How cross-chain bridges work is why the source chain collects a fee in its own coin first.

Unwrap does not produce POL

Withdrawing WETH returns ETH on Ethereum. Swapping WETH for USDC or USDT on Ethereum keeps you on chain id 1. This route is the wrong tool for both outcomes. Use it when the missing piece is POL for a chain 137 signature. If you already hold a Polygon token, swap that token for POL locally.

Keep some POL unspent

The POL you receive pays the next transaction. Sending the entire balance onward can leave other tokens stuck. Chain id 137 is inexpensive next to mainnet and still charges a fee. Leave a remainder sized for an approval plus a swap.

Legal

Risk disclosure

XAUConnect is a non-custodial swap aggregator. Digital assets are volatile and may lose value rapidly. Content on this page is educational and not investment advice. Verify every contract address on the official block explorer before approving a transaction.

Frequently asked questions

What is the best way to swap WETH from Ethereum to POL on Polygon?

You approve WETH at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 on Etherscan. You receive native POL, marked 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, which Polygonscan shows as the gas balance of chain id 137.

Does this unwrap WETH into ETH first?

The result you hold is native POL on chain id 137, not native ETH on Ethereum. WETH at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 is what you approve on Etherscan. A local unwrap credits ETH on chain id 1 and stops. If ETH on Ethereum is the goal, do not open this pair.

How do I confirm the POL arrived?

Set the wallet to chain id 137 and check the native balance on Polygonscan. The marker 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE is not a contract page you need to open. Blocks are about 2 seconds. If the wallet is still on Ethereum, you will keep seeing ETH and miss the POL.

What if I hold WETH and no ETH?

Unwrap a small slice of WETH to native ETH on Ethereum so the approval can pay gas. Then spend the remaining WETH on this route. Chain id 1 will not accept WETH as a fee. The POL you receive later cannot pay that first transaction.

Live execution

Trade on XAUConnect

Open the swap page with this cross-chain route pre-selected, then connect your wallet on the source chain to quote and execute. You keep the keys.

Swap cross-chainExplore markets

Continue exploring

Related markets, guides & networks

Next pages on this subject. Read them before you trade.

Networks
Tokens
Guides
Articles

Build programmatically

Swap via API for bots and AI agents: quotes, builds, and cross-chain routes.

Developer quickstart