Ethereum recently tested a fascinating approach to cross-chain transactions: instead of “bridging first, then moving to another chain,” the mainnet and an L2 execute together in a single transaction.
This is known as “atomic cross-chain.”
EEZ contributor Eduardo Antuña Díez demonstrated an atomic cross-chain transaction from mainnet to an L2. The record includes a cross-chain call of 0.001 ETH and the corresponding Rollup state update.
The key isn’t the amount, but the mechanism.
An atomic transaction means that multiple actions across networks either all succeed, or, if any step fails, they all revert.
This addresses one of the biggest problems with cross-chain transactions: one side completes, but the other doesn’t catch up.
EEZ’s vision is to enable the mainnet and different L2s to interact directly within a single transaction, reducing reliance on cross-chain bridges.
If it’s eventually implemented, the significance may go beyond simply “making cross-chain transactions more convenient”—it could reconnect liquidity that’s currently fragmented across different L2s.
So what’s really worth paying attention to in this test isn’t the 0.001 ETH, but the potential shift in how cross-chain transactions work:
From “assets pass through a bridge on their way to another chain” to “multiple networks working together in a single transaction.”
Of course, this is still in the testing phase, and widespread real-world use is still some way off.
But if this mechanism matures, cross-chain bridges may no longer be the only intermediaries connecting L2s.
This is known as “atomic cross-chain.”
EEZ contributor Eduardo Antuña Díez demonstrated an atomic cross-chain transaction from mainnet to an L2. The record includes a cross-chain call of 0.001 ETH and the corresponding Rollup state update.
The key isn’t the amount, but the mechanism.
An atomic transaction means that multiple actions across networks either all succeed, or, if any step fails, they all revert.
This addresses one of the biggest problems with cross-chain transactions: one side completes, but the other doesn’t catch up.
EEZ’s vision is to enable the mainnet and different L2s to interact directly within a single transaction, reducing reliance on cross-chain bridges.
If it’s eventually implemented, the significance may go beyond simply “making cross-chain transactions more convenient”—it could reconnect liquidity that’s currently fragmented across different L2s.
So what’s really worth paying attention to in this test isn’t the 0.001 ETH, but the potential shift in how cross-chain transactions work:
From “assets pass through a bridge on their way to another chain” to “multiple networks working together in a single transaction.”
Of course, this is still in the testing phase, and widespread real-world use is still some way off.
But if this mechanism matures, cross-chain bridges may no longer be the only intermediaries connecting L2s.