The Avalanche Bridge (AB) can be used to transfer ERC20 tokens from Ethereum to Avalanche's C-Chain and vice versa. This document answers common questions about the bridge. If there are additional questions, please contact the Ava Labs team on Avalanche's support website, Discord, or Telegram.
Is there an airdrop provided for transactions on the Ethereum to the Avalanche Bridge?
When users bridge $75 or more of assets from the Ethereum Network to the Avalanche Network, a portion of AVAX will be airdropped to help pay for initial swaps. Those funds should be used to acquire additional AVAX, as this will be needed to pay for fees on any dApp within the Avalanche ecosystem.
What can I do if my transaction seems stuck?
If the Ethereum transaction transferring funds over the bridge to Avalanche seems stuck and does not have any confirmations, you can speed up the transaction as described here.
What if the gas price is more than the amount I am transferring?
When moving assets from Avalanche back to Ethereum, the bridge charges an in-kind transfer fee. The user interface does now allow transfers less than the fee amount. If a user manually generates and issues such a transaction, the bridge will mark the transfer as invalid and not process it.
What does the .e suffix in the token name mean?
When bridging assets from the Ethereum Network to the Avalanche Network using the official bridge (bridge.avax.network) assets will arrive on the Avalanche side with a " .e " designation.
For example, sending WETH (from Ethereum), over the bridge to the Avalanche Network, will show up as WETH.e.
Note that to send " .e " designation tokens back to the Ethereum side, it is the same process but in reverse, resulting in WETH.e turning into WETH.
How long does a bridge transfer take?
The Ethereum Network transaction will typically take around 20 minutes. The Avalanche Network transaction takes a few seconds.
Why is the Avalanche transaction part of the bridge taking so long?
This transaction only takes a few seconds, and if the Avalanche Bridge interface shows it taking longer, then check the tx in the Explorer to see if it was successful. Users may need to add the token to the wallet on the Avalanche Network for it to appear.
Can I send tokens created on Avalanche to Ethereum?
Not yet. The AB currently only supports the transfer of ERC20 tokens created on Ethereum to Avalanche and back. There are plans to enable this in the future.
What if my transaction is not visible in the explorer?
The transactions that correspond to bridge transfers will appear on explorers for the Avalanche and Ethereum networks. It may take a few minutes for the transactions to appear. To search for your transaction in the explorer, copy and paste your address into Avalanche's C-Chain Explorer or Etherscan. To view the transactions sent by the bridge itself, you can look here for Avalanche and here for Ethereum. If you still don't see your transaction, reach out on Telegram or Discord.
Are there any tutorials on how to use the bridge?
Yes, you can view video tutorials for bridge functionality here.
How can I use dApps on Metamask?
Once a browser extension like Metamask has been downloaded, dApps on Avalanche can be used. Popular features, such as yield farming, require tokens other than AVAX in the wallet. If these tokens are on Ethereum (or an exchange that can send them to Ethereum), one of the cheapest and fastest ways of bringing them over is the Avalanche Bridge.
How do I pay for transaction fees on Avalanche?
On Avalanche, transaction fees are paid in the native asset, AVAX. In order to send transactions on the Avalanche C-Chain, you must have sufficient AVAX in your wallet to cover the cost of the gas for the transaction. To help you get started on Avalanche, the bridge will airdrop you a small amount of AVAX if you move more than $75 (subject to change) worth of tokens over from Ethereum. In order to avoid running out of AVAX to cover your transaction fees, we recommend first buying an adequate amount of AVAX. You can do so on Pangolin.
Can I send it to a different address on the other network?
The bridge only allows transfers to the same address on the other network. After the asset is transferred to the other network, it can be sent to any address or contract.
Can I speed up my transaction?
Yes, users can click on the “Speed Up” button on MetaMask. Click here for more information on how to speed up a transaction.
Why does the number of tokens shown on Metamask not match the number I specified?
When transferring from Avalanche to Ethereum, Metamask shows that 0 tokens are to be transferred, not the actual number of tokens. This is a known problem with Metamask.
What is the Bridge's address on Ethereum and Avalanche?
Note that you should not directly transfer tokens to these addresses. You should use the Bridge's user interface, which checks for malformed transactions.
To ensure the safety of users and the protection of their funds, the Avalanche Bridge should only be accessed and used through the UI, located here. Any other use of the Avalanche Bridge could result in the permanent loss of funds. The non-exhaustive list below enumerates possible ways to permanently lose funds by attempting to use the Avalanche Bridge through sources that are not recommended. Funds lost in the examples listed below will be permanently lost, and are not recoverable by Ava Labs, the Bridge Nodes, or the bridge.
USERS MUST NOT SEND FUNDS DIRECTLY TO ANY OF THE AVALANCHE BRIDGE CONTRACT ADDRESSES. The Avalanche Bridge should only be accessed through the Avalanche Bridge’s UI, located here. Any funds sent directly to the Avalanche Bridge’s contract addresses will be permanently lost, and are not recoverable.
USERS MUST NOT SEND FUNDS DIRECTLY TO ANY OF THE AVALANCHE BRIDGE WALLET ADDRESSES. The Avalanche Bridge should only be accessed through the Avalanche Bridge’s UI, located here. Any funds sent directly to the Avalanche Bridge’s wallet addresses will be permanently lost and not recoverable.
DO NOT ATTEMPT TO USE ANY SMART-CONTRACT WALLET WITH THE AVALANCHE BRIDGE. The Avalanche Bridge is currently not compatible with smart contract wallets because smart contracts are currently not supported by the Avalanche Bridge. Using the Avalanche Bridge with a smart contract wallet or smart contract will result in the permanent loss of funds. Users should not use smart contracts with the Avalanche Bridge at this time because no one can retrieve tokens lost when smart contract wallets try to use the Avalanche Bridge. This is not a statement against smart contract wallets or the below list of smart contract wallet projects, which is not an exhaustive list. This is to make users aware of the current technical architecture. WE CAN NOT RETRIEVE YOUR TOKENS.
There is a bug in the Metamask Mobile app that affects bridge transactions (only on mobile). Until this is resolved, don't use the Metamask mobile app for bridge transfers. We suggest using the Metamask desktop app, or, if on mobile, Coinbase Wallet.
You need AVAX to pay for transaction fees on Avalanche. You should use the AVAX you receive in the airdrop to do a swap for more AVAX on an AMM so that you can pay for transaction fees. If you run out of AVAX, you will not be able to do transactions on Avalanche.