Cross-chain · Ethereum → Avalanche C-Chain

Swap WETH from Ethereum to AVAX on Avalanche C-Chain

Swap WETH from Ethereum to AVAX on Avalanche C-Chain. You send wrapped ether from Ethereum and you receive native AVAX on Avalanche C-Chain, the coin that pays gas there.

WETH is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, an ERC-20 you approve, and Etherscan is the record of that approval. Gas for the approval is native ETH on chain id 1, with blocks around 12 seconds. The AVAX side uses the marker 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, which on C-Chain means the native gas coin, not WETH. Snowtrace is the explorer. Chain id 43114. Not the X-Chain.

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

WETH in, not the gas coin

You must hold WETH at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 and you must approve it. The ETH you use for fees is a second balance. If someone tells you WETH and ETH are the same button on this page, they are wrong. Unwrapping WETH gives you ETH on Ethereum. It does not give you AVAX, and it does not finish this route.

Native AVAX uses the placeholder

The destination string 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE is not a token contract on Snowtrace. On C-Chain it means native AVAX. That AVAX can pay later fees, which is different from receiving USDC or USDT, where you would still need a separate gas balance. Do not hunt for that placeholder as an ERC-20. Do not send the route to an X-Chain address.

Wrong when you wanted dollars or a simple unwrap

Pick another page if you need Circle USDC or Tether. This one pays a volatile coin, and the AVAX amount can move while Ethereum is still confirming. It is also the wrong tool if you only wanted to turn WETH back into ETH. That unwrap never leaves Ethereum. Read the C-Chain page if you are unsure which Avalanche network you are on. No fill time and no price is guaranteed.

Leave ETH for gas and judge the AVAX floor

The approval and the swap both cost ETH. Draining ETH to wrap more WETH can stall the send. On the quote, the AVAX estimate and the minimum AVAX are different lines. Sign against the minimum. A 12 second block time is only the Ethereum pace, not a promise that AVAX is already in the wallet. Check chain id 1 in the wallet before you confirm.

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 AVAX on Avalanche C-Chain?

WETH is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, an ERC-20 you approve, and Etherscan is the record of that approval. Gas for the approval is native ETH on chain id 1, with blocks around 12 seconds.

Does receiving AVAX mean I can skip holding AVAX beforehand?

The AVAX from this route can pay C-Chain gas after it arrives. You do not need a prior AVAX balance for the payout to land, but you do need ETH on Ethereum to approve WETH and to send the swap. Snowtrace shows the native AVAX credit. The marker is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE.

Why is the destination address not a normal token contract?

Because native AVAX is the gas coin, and routers mark it with 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE instead of an ERC-20. WETH on the way in is a real contract, 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, which you can open on Etherscan. The two strings are supposed to look different.

What if I wanted USDT and opened this by mistake?

Stop. This page pays AVAX, not Tether. Selling WETH for USDT on C-Chain is a different route with a different destination contract. Signing here gives you a coin that moves with the AVAX market. If the quote is still unsigned, leave and open the USDT page.

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