[General] OP Stack + Alt-DA vs Standard Mode: Real Fee Comparison After EIP-4844 - Is the Cost Savings Significant?

[maxinmos]

Discussion Topic

I'm analyzing OP Stack options for deploying a chain focused on minimizing L1 costs. After EIP-4844, I understand that:

• The cost to store data using blobs is now extremely cheap after EIP-4844; in practice, it is almost negligible compared to other L1 fees.
• L1 transaction overhead (output root proposals + batch submissions) is now the dominant cost.

Specific cost question:

• In Standard Mode: batch posting (blobs) + output root proposals = X total L1 cost
• In Alt-DA Mode: commitment posting (~32 bytes per 128kb chunk) + DA layer fees + output root proposals = Y total L1 cost

How much does Y < X? Is it meaningful (~50%+ savings) or marginal (~5-10% savings)?

My analysis: Since output root proposals require fixed L1 transaction overhead regardless of mode, and blob costs are already minimal after EIP-4844, Alt-DA only saves on the small data posting component (~1% of total). This suggests Y ≈ X - 5% to 10%, making the practical difference negligible.

Is my cost analysis correct, or are there significant hidden cost savings in Alt-DA mode that I'm missing?

[imtipi]

my personal answer:correct,lower than 10%.since blob gas fee already extreme cheap last 180days

the blob gas data source i read:https://blobscan.com/stats
also some gas data about existing op stack chain:https://app.hex.tech/61bffa12-d60b-484c-80b9-14265e268538/app/Supercharts-Monthly-Superchain-Metrics-PUBLIC-55tuCeO5kdMfpIbe62h5lQ/latest?tab=wip-chain-econ--fee-scalars

[joohhnnn]

Hi @maxinmos , I’m not exactly sure how big the difference is between the two, but if you’re using fault proofs, keep in mind that many fault-proof–related operations can consume quite a bit of gas—for example, creating a fault proof game. You can check it out here:
https://etherscan.io/address/0xe5965Ab5962eDc7477C8520243A95517CD252fA9