The Blast bridge transfers ETH and supported stablecoins from Ethereum to Blast. Blast is an Ethereum Layer 2 where eligible balances can earn native yield, though rates change and can fall to zero. To make that transfer, the Blast bridge moves your assets onto Blast for you to hold or use.
How Does the Blast bridge Work?
An Ethereum to Blast bridge transaction starts when you deposit assets into a bridge contract on Ethereum. A message then leads to a corresponding balance on Blast. Ethereum.org describes this deposit-and-credit process for optimistic rollups. Your wallet can use the same address on both networks, but it shows a separate balance on each.
What arrives depends on what you deposit. ETH arrives as ETH, which you can also use to pay transaction fees, called gas, on Blast. A supported stablecoin can arrive as USDB, Blast’s native dollar token, rather than the token you sent. If you deposit DAI, check that USDB is the expected Blast-side asset before confirming.
Native yield means an eligible ETH or USDB balance can grow automatically, a mechanism called rebasing. The yield depends on returns from assets backing those balances; it is variable and may be zero. It also brings risk from those backing assets, so a growing balance is not a guaranteed return.
How Do You Move ETH or Stablecoins to Blast?
To bridge ETH to Blast, imagine moving 0.1 ETH from your own Ethereum wallet. Follow the transfer from the Ethereum transaction through to the balance that appears on Blast:
- Use a wallet holding ETH on Ethereum and set Blast as the destination network. Check the receiving address carefully, especially if it differs from your own wallet address.
- Enter 0.1 ETH and review the estimated amount you will receive. Leave enough ETH in the Ethereum wallet to pay gas for the deposit.
- Confirm the Ethereum transaction in your wallet. After it confirms, allow time for the bridge to process the deposit, then view your balance on the Blast network.
- Check that the ETH has arrived before trying to spend it. An Ethereum confirmation shows the deposit happened; it does not by itself show that the Blast balance is ready.
A stablecoin transfer may require an extra Ethereum transaction first. Called an ERC-20 approval, it authorizes the bridge contract to use the amount you permit; read that amount before signing. You then confirm the deposit separately. If the token or receiving address is unfamiliar, a small test transfer can help, but it has its own gas cost.
What Will It Cost, and How Do You Return to Ethereum?
Your deposit cost depends on Ethereum gas at the time you send it and any bridge charge shown for the transfer. Later activity on Blast also uses gas, paid in ETH. Gas prices move with network demand, so the estimate at confirmation is more useful than a fixed dollar figure. A stablecoin approval, when required, adds another Ethereum gas payment.
Returning to Ethereum is a separate withdrawal. Blast’s standard withdrawal route has an optimistic-rollup waiting period of about seven days, and completing the withdrawal on Ethereum can require more gas; L2BEAT documents this exit window. A faster route may be available through a liquidity provider, but its fee and risks differ from the standard withdrawal.
Before moving a large balance, compare the likely yield with the cost of going in and coming back, especially if you expect to leave soon or the current yield is zero. Keep a little ETH on Blast for gas, and check the asset you will receive each time you transfer.