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The public, receipt-calibrated source of truth for Mantle DA economics — and the live oracle-vs-receipt divergence tracker.

Gas Observatory

The Gas Observatory is Archon's public, wallet-free source of truth for Mantle data-availability (DA) economics. It lives at:

/observatory

Where a single audit report shows the gas story for one contract, the Observatory shows the story for the chain: what a calldata byte actually costs in DA today, where the L2 base fee sits, how both move over time, and — most importantly — how far the legacy fee oracle drifts from what Mantle really charges.

What it shows

  • Receipt-calibrated DA cost per calldata byte and the current L2 base fee, with 24h / 7d / 30d trends. Every figure traces back to real transaction receipts, and the sample size behind each number is shown.
  • "What it costs on Mantle today" cards — a typical transfer, swap, and deploy — priced from the live model, each labeled measured, estimated, or unpriced.
  • The oracle-vs-receipt tracker: a standing chart of the legacy GasPriceOracle.getL1Fee prediction against the charged receipt l1Fee ground truth. This is the living, continuously-updated version of ADR 0007 — the same divergence the whitepaper reports in Table 1, kept current instead of frozen.

Embed & data access

The oracle divergence chart is iframe-embeddable, so any project or dashboard can show the live Mantle DA truth:

<iframe src="https://archonaudit.xyz/embed/observatory/oracle" width="100%" height="420" style="border:0"></iframe>

A machine-readable snapshot of the current readings is served at:

GET /api/observatory

Methodology

The Observatory is fed by a single repeatable sampler worker that also feeds Archon's DA pricing model — one calibration loop, one source of truth:

  • Sampling. Recent Mantle transactions are read in batches under a hard per-day RPC budget with backpressure; per-cycle call counts are logged. No number is invented to fill a gap — a thin sample is shown as thin, not smoothed over.
  • Calibration. DA cost is fit with a two-variable (zero/nonzero calldata byte) least-squares model against receipt ground truth. The fit is version-stamped and its validation error is published, so the model's own accuracy is auditable.
  • The oracle caveat. getL1Fee is a predeploy interface that cannot reproduce Mantle's richer post-migration fee fields (l1Fee, l1GasUsed, l1GasPrice, blob fee fields, daFootprintGasScalar, operator fees); it is shown precisely because it diverges, never as a pricing source.
  • Labeling. Every value carries its evidence class — measured (from a receipt), estimated (calibrated, labeled), or unpriced — the same taxonomy used across reports and the leaderboard.

The full methodology, including sampling cadence and the oracle-call caveat, is documented at /observatory/methodology.

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