Cross-chain · Avalanche C-Chain → Arbitrum One

Swap AVAX from Avalanche C-Chain to WETH on Arbitrum One

Swap AVAX from Avalanche C-Chain to WETH on Arbitrum One. Native AVAX leaves C-Chain, and Arbitrum WETH is what can arrive. You receive wrapped ether, not the ETH that pays gas.

AVAX is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE on Avalanche C-Chain, chain id 43114. Snowtrace treats that as native gas, not as a token approval. WETH is 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1 on Arbitrum One, chain id 42161. Arbiscan is the explorer that can prove it. Polygon's WETH and Base's WETH are different addresses. Ethereum's WETH is different again. This page delivers only the Arbitrum contract.

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

Do not reuse a WETH address from another chain

The contract that matters here is 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1. Polygon WETH is 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619. Ethereum WETH is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 on chain id 1, with about 12 second blocks and Etherscan. Pasting any of those into an Arbitrum token list does not create this balance. WBTC is not this asset either, and WBTC is not native bitcoin.

Native AVAX goes in, and a remainder has to stay

There is no ERC-20 approval for the sentinel. There is an AVAX fee on chain id 43114. Selling the whole stack leaves the transaction unpaid. X-Chain AVAX cannot be substituted. Snowtrace should show native AVAX leaving a C-Chain account. If the wallet is on the wrong Avalanche network, the balance you think you have is not the balance the quote can spend.

WETH on arrival does not unlock the next Arbitrum action

Gas is ETH, chain id 42161, not Nova. A WETH-only wallet still cannot transfer WETH. If you needed the fee coin, the native ETH route is the matching page. If you needed dollars, Circle USDC or Tether USDT is the matching page. Using this hop as a generic on-ramp for Arbitrum is how you land in the wrapper and then discover you cannot move it.

Stay home if the pool that wants WETH is not on Arbitrum

Bridging AVAX into Arbitrum WETH, then bridging onward, pays the cross-chain cost twice. Do it when a specific Arbitrum contract calls for this WETH. The sequence of lock and release is described in how to bridge assets between chains. Accept the minimum only when that WETH amount is the inventory you wanted.

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 Arbitrum One?

AVAX is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE on Avalanche C-Chain, chain id 43114. Snowtrace treats that as native gas, not as a token approval.

Is Arbitrum WETH the same contract as Polygon WETH?

No. This route delivers 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1 on Arbitrum One, chain id 42161. Polygon WETH is a different address on chain id 137. Check Arbiscan, not Polygonscan. AVAX left C-Chain as native gas. The wrapper you receive cannot pay Arbitrum fees. Do not send a second time while the first transfer is still open.

What is the AVAX address on this quote?

0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, the native gas sentinel, on Avalanche C-Chain, chain id 43114. It is not an ERC-20 approval. Snowtrace is the explorer. X-Chain AVAX will not fund it. Leave enough AVAX to pay the outbound fee or the send cannot broadcast. Confirm the contract on the explorer before you sign.

Can I skip holding ETH if I only want to keep WETH?

Only if you never need to move it. Gas on Arbitrum One is ETH, and WETH is not that gas. Nova will not show this token. If the next step is a transfer or a pool deposit, hold ETH first. If you needed fees rather than the wrapper, this route is the wrong one.

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