# Costs that L2s pay to Ethereum for security

Source: https://l2beat.com/scaling/costs
Kiwi News: https://news.kiwistand.com/stories/Costs-that-L2s-pay-to-Ethereum-for-security?index=0x66b4d1c4adc034d7e09956318e3a80d6c67672658a309df04df821f5cb1bc1bca02633d4
Submitted by tim on 2024-08-08 UTC, 2 upvotes, 0 comments

## Summary

This page describes Onchain Costs, a tracker of the fees that Layer 2 networks pay to Ethereum for posting transaction data, proofs and state updates. The figures reflect costs borne by the L2 itself, not fees paid directly by users. Rollups periodically post state commitments to Ethereum, which are validated either by validity proofs or accepted optimistically and open to challenge through a fraud proof window. Because L2 data is also posted to Ethereum, the page states that no additional trust assumptions are introduced.

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Costs

Onchain Costs tracks the fees paid by L2s to Ethereum for posting transaction data, proofs, and state updates. These costs provide insights into the economic efficiency of different solutions. Note that these values represent the costs incurred by the L2 itself, not the fees paid directly by users.

Rollups are L2s that periodically post state commitments to Ethereum. These commitments are validated by either Validity Proofs or are accepted optimistically and can be challenged via Fraud Proof mechanism within a certain fraud proof window. Additionally L2 data is also posted to Ethereum, hence there are no additional trust assumptions introduced.

Onchain costs stacked by type

8 Oct — 7 Nov 2026