Ethereum Layer 2 fees are significantly lower than Ethereum mainnet fees due to the bundling and compression of transactions. This structural shift allows scaling networks to process execution separately while relying on the main chain for security, data availability, and final settlement.
How Ethereum Layer 2 Networks Function
To understand why fees on scaling networks are economical, it helps to examine how responsibilities are divided between the base layer and scaling solutions. The Ethereum mainnet is designed to handle final settlement, security verification, and decentralization. Because block space on the main chain is limited and demand is high, executing transactions directly on the mainnet incurs high gas costs.
Layer 2 networks step in to handle execution separately. Instead of broadcasting every single user interaction directly to the base chain, an L2 processes transactions locally. These transactions are then bundled and compressed before being submitted to Ethereum. Processing transactions separately before settling on Ethereum provides scalability and cheaper execution.
| Metric | Ethereum Mainnet (Layer 1) | Ethereum Layer 2 Networks |
|---|---|---|
| Transaction Processing | Handles final settlement and security verification | Processes transactions separately before settling on Ethereum |
| Transaction Fees | Higher fees due to limited block space and strong security guarantees | Lower fees because transactions are bundled and compressed |
| Main Purpose | Provides security, decentralization, and settlement | Provides scalability and cheaper execution |
The Role of Blobs and the Dencun Upgrade
Operating a scaling network requires posting state data back to the base chain to maintain security and trust assumptions without introducing vulnerabilities. Historically, rollups used standard CALLDATA transactions on Ethereum to store this data, which accounted for up to 80% of L2 transaction costs.
The introduction of EIP-4844 through the Dencun upgrade fundamentally transformed this dynamic by introducing data "blobs." Proto-Danksharding utilizes blob-carrying transactions that create extra temporary storage space in blocks, limiting blobs to 16 per block with a maximum of 128 KB each. Blobs significantly reduce posting costs, ensuring that rollup operating expenses remain at a near minimum most of the time.
By shifting away from expensive CALLDATA storage, Ethereum gives rollups scalable relief. The demand for these blobs directly determines how much revenue Ethereum captures from Layer 2 activity, linking the growth of scaling ecosystems directly to the economic security of the base chain.
Where Layer 2 Transaction Fees Go
When an end user interacts with an L2 network like Arbitrum One, Optimism, or Polygon, they pay a gas fee that represents the computational resources required to execute the transaction. Similar to the mainnet, higher transaction complexity consumes more gas and increases the fee.
However, the fee distribution differs across networks:
- Sequencer Revenues: A portion of the user fee goes directly to network sequencers and validators who order transactions and ensure smooth network operation.
- Settlement Fees: Another portion covers the onchain costs incurred by the L2 itself when posting transaction data, state updates, and validity or fraud proofs back to Ethereum.
It is important to separate user-facing fees from backend onchain costs tracked for L2s. While users might pay nominal amounts (often between $0.10 and $0.50) to transfer assets using smart contracts on an L2, the network itself manages separate accounting for the data it publishes to the Ethereum mainnet.
Frequently Asked Questions
Why are Ethereum Layer 2 fees lower than mainnet fees?
Layer 2 networks process transactions separately from the Ethereum mainnet by bundling and compressing multiple user actions together. This significantly reduces computational and data storage overhead, passing immense savings directly to users.
How did the Dencun upgrade change Layer 2 costs?
The Dencun upgrade introduced EIP-4844 and data "blobs," which replaced expensive calldata transactions for storing L2 data on Ethereum. This innovation drastically lowered operating costs for rollups and keeps user fees at a near-minimum most of the time.
What are onchain costs for Layer 2s?
Onchain costs represent the expenses incurred by the Layer 2 networks themselves when they post transaction data, validity or fraud proofs, and state updates back to Ethereum. These are distinct from the fees paid directly by everyday users to execute transactions on an L2.
References & Sources
- Ethereum Fees Are Collapsing as Layer 2 Grows: Can ETH Still Capture Value? - Bitcoin Foundation
- L2 Fees: How They Work and Their Impact on Crypto Transactions
- The Impact of Blobs on Ethereum Layer 2 Fees
- Costs - ETHBEAT
- Understanding Ethereum, Layer 2 (L2), and more network fees | Zengo Help Center
Editorial Note: This article was researched via verified live web sources and published on 2026-11-11. Questions or feedback? Contact the editorial staff at TrendsInNews.
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