ethwatch ← Methodology

Layer 2 methodology

What rollups charge their users and what they pay Ethereum to settle.

2 of 5 entries carry independent evidence · Current values: /llms-full.txt

Median transaction cost (USD)

api
Source
growthepie fundamentals, txcosts_median_usd
Endpoint or contract
https://api.growthepie.xyz/v1/fundamentals.json
Derivation
Last COMPLETE day's median transaction cost for that rollup. The current partial day is excluded.

Evidence

2026-08-28, against the rollup's own gas price x 21,000: Scroll $0.00251 vs $0.00001, Base $0.00149 vs $0.00032, Arbitrum $0.00417 vs $0.00106.

Caveats

  • The earlier gasPrice x 21,000 method captured only the rollup's execution gas and omitted the L1 data fee that dominates a rollup transaction — it understated Scroll by more than two orders of magnitude, and for zkSync and Starknet the EVM transfer constant does not describe the gas model at all.
  • Null where growthepie publishes no median for a chain, as with zkSync Era.

Pays L1 (USD/day)

api
Source
growthepie fundamentals, costs_total_usd
Endpoint or contract
https://api.growthepie.xyz/v1/fundamentals.json
Derivation
Last complete day of total L1 settlement cost, which is calldata/proof costs PLUS EIP-4844 blob costs.

Evidence

2026-08-28 for Arbitrum: costs_l1_usd 40.29 + costs_blobs_usd 7.66 = costs_total_usd 47.95. Using the non-blob component alone understates settlement spend by 8-16% depending on the chain.

Caveats

  • The daily series is genuinely volatile — Arbitrum swung between $20 and $252 within six days — so a single day is a poor headline and the completed day is used deliberately.

Daily transactions (count)

api
Source
growthepie fundamentals, txcount
Endpoint or contract
—
Derivation
Last complete day.

Evidence

Not independently verified

Caveats

    Daily active addresses (count)

    api
    Source
    growthepie fundamentals, daa
    Endpoint or contract
    —
    Derivation
    Last complete day.

    Evidence

    Not independently verified

    Caveats

    • Address counts are not user counts.

    Rollup gas price (gwei)

    on-chain
    Source
    each rollup's own RPC, eth_gasPrice
    Endpoint or contract
    —
    Derivation
    Read live from the chain.

    Evidence

    Not independently verified

    Caveats

    • Shown as the rollup's execution gas price only. It is NOT the user's transaction cost — see the median above.