Cross-chain · Avalanche C-Chain → Polygon

Swap AVAX from Avalanche C-Chain to WETH on Polygon

Swap AVAX from Avalanche C-Chain to WETH on Polygon. Native AVAX is what leaves C-Chain, and Polygon WETH is what can arrive: an ERC-20 claim on ether, not POL, and not ETH sitting on Ethereum.

The source side is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, the native gas sentinel, on Avalanche C-Chain, chain id 43114. Snowtrace is the explorer for that send. The WETH you want on Polygon is 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619. Confirm it on Polygonscan. Polygon is chain id 137, and gas there is POL, so WETH cannot pay the next transaction.

Diagram for Swap AVAX from Avalanche C-Chain to WETH on Polygon
AVAX leaves Avalanche C-Chain. WETH is what can arrive on Polygon.

C-Chain AVAX is the only balance this quote spends

Avalanche C-Chain charges the outbound fee in AVAX. The sentinel address is native gas, not an ERC-20 you approve. An X-Chain or P-Chain balance will not fund this quote, even if the wallet labels it AVAX. If the network badge is not chain id 43114, stop and switch before you type an amount. Selling the entire AVAX balance also fails, because the fee is AVAX too.

Polygon WETH cannot cover the POL fee

Polygon WETH at 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619 is a wrapped ether ERC-20. It is not native ETH, and it is not the WETH contract on Ethereum. ETH and WETH are different instruments. WBTC is a different wrapped claim and is not native bitcoin; this route does not deliver it. After the WETH balance shows on Polygonscan, you still need POL on chain id 137 to move it.

Skip this hop when POL or mainnet ether is the goal

This route is the wrong job if you need POL for gas, Circle USDC, or Tether USDT. It is also wrong if you wanted ether on Ethereum, chain id 1, where blocks are about 12 seconds and the explorer is Etherscan. Stay on C-Chain when the pool you want already quotes AVAX there. Bridging out only to swap and come back pays fees twice. The minimum on the quote is the floor, and there is no clock on the bridge.

Pair Snowtrace with Polygonscan before the signature

Match the source sentinel on Snowtrace and the WETH contract on Polygonscan before you sign in your own wallet. The lock, proof, and release steps are the subject of how cross-chain bridges work. Start with a size you can afford to see fail. If the wallet still says MATIC, confirm the network is Polygon and the gas asset is POL.

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 AVAX from Avalanche C-Chain to WETH on Polygon?

The source side is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, the native gas sentinel, on Avalanche C-Chain, chain id 43114. Snowtrace is the explorer for that send.

Does AVAX to Polygon WETH deliver ETH on Ethereum?

No. AVAX leaves Avalanche C-Chain and WETH at 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619 is what can arrive on Polygon. Native ETH on Ethereum is chain id 1 and pays gas there. WETH is an ERC-20, so it cannot pay POL gas on Polygon either. Check Polygonscan for the arrival, not Etherscan.

What does the 0xEeee address mean on the AVAX side?

0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE is the native gas sentinel for AVAX on Avalanche C-Chain, chain id 43114. It is not an ERC-20 you approve, and it is not an X-Chain balance. Snowtrace is where you confirm the send. Keep some AVAX so the source transaction can pay its own fee.

Should I use this route if I only need POL?

No. This page is wrong when you want POL, the Polygon gas token on chain id 137. WETH is a wrapped ether contract, not the fee coin. If you already hold a Polygon asset that trades against WETH, swap on Polygon and skip the bridge. The quote minimum is the floor.

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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.

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