PLX-003 · 2026-08-31

Settler-frame day census, 2026-08-31 UTC

99,837 EIP-3009 transactions; 87.4% by known settlers; Coinbase 72,246 purchases, $8,996, 1,574 buyers, 716 sellers. Coverage 1.000.

frame: settler-eip3009-base · 2026-08-31 UTC · blocks 50,672,527–50,715,726
coverage: 44 of 44 chunks retrieved · ratio 1.000
rows scanned: 125,113

data.json · METHOD.md

Purchase counts are the honest headline. Dollar totals in this frame carry gasless transfers that are not x402, so they are not the economy's.

Per facilitator

Sorted by purchases. Chained hops are folded into one purchase, so a fee held back by a settling contract shows as a fee, not as a second sale.

Breadth

• 451 buyers paid ≥2 sellers
• 29 buyers used ≥2 facilitators
• 6 sellers settled through ≥2 facilitators

Top attributed sellers

Sellers paid through a known settler. Hover an address for the full value.

The residual

Submitters this scan saw that the registry does not name. They are the reason the attributed share is below 1.

Method

METHOD.md as written.

# Reading #3 (PLX-003) — Settler-frame day census, 2026-08-31 UTC

First reading whose coverage is a computed number: `scan-manifest.json`,
44 chunks, 44 ok, **coverage 1.000**. Data: `settler-census.json`.
Registry: `settlers.json` (x402-list, CC BY 4.0, fetched 2026-09-01).

## Frame

EIP-3009 authorizations on Base USDC (`AuthorizationUsed`), attributed to
a facilitator when the submitting wallet (`tx.from`) is in x402-list's
settler list (22 facilitators, 84 addresses). Blocks 50,672,527–50,715,726
(2026-08-31T00:00:00Z → 23:59:59Z). Outside the frame: plain-transfer or
permit-based settlement, Polygon, Solana. Method: `docs/settler-feasibility.md`;
instrument: `collector/settler.py` (`settler-scan` + `settler-census`).

## Headline

- 99,837 EIP-3009 txs on the day; **87.4% submitted by a known settler**.
- Coinbase rail: **72,246 purchases · $8,996 · 1,574 buyers · 716 sellers**.
  Then fluxa 12,655 · payAI 1,623 · mrdn 268 · primer 200; nine more
  facilitators under 200.
- Breadth: 451 buyers paid ≥2 sellers; 29 used ≥2 facilitators; 6 sellers
  settle through ≥2 facilitators.
- Only **2.2% of EIP-3009 USDC is x402**: $1.37M of the day's $1.40M is
  gasless treasury-scale transfers by unknown submitters (13 rows ≥ $1,000
  carried $74k in the 1h proof alone). Dollar totals here are not the
  economy's; purchase counts are the honest headline.

## Cross-check (x402-list, Coinbase)

| x402-list figure | value | ours |
|---|---|---|
| `tx_count_24h` @ 19:20Z | 48,320 | 72,246 |
| `tx_count_24h` @ 19:32Z | 57,205 | 72,246 |
| `tx_count_7d` / 7 | 59,764 | — |
| `volume_usd_24h` @ 19:32Z | $6,298 | $8,996 |

Same settler set, same chain. Ours runs 26% above their rolling 24h count
and 21% above their 7-day mean; their "24h" moved 18% in 12 minutes, so it
is a rolling or recomputed window whose bounds they do not publish. The 1h
proof on 2026-09-01 (19:00Z) ran at 2,546 coinbase tx/h = 61k/day.
Unresolved; recorded, not reconciled.

## Corrections made while building

1. **Hop folding.** fluxa and mrdn settle through a contract: every tx is
   buyer → contract → seller with a fee held back (mrdn $26.05 → $25.79).
   Counting both transfers doubled their USDC and listed the contract as a
   seller. `census()` now folds chained hops into one purchase (buyer,
   final seller, buyer-paid amount, fee); a downstream leg paying out more
   than it received is left alone (swap/bridge, not a fee).
2. **Receipt provider.** publicnode 403s `eth_getTransactionReceipt`; the
   first run recorded 2/2 chunks as `fail:` and resumed cleanly on
   blastapi. The manifest contract did its job.

## Residual worth labeling (bead vault-3hz2v)

`0x1360…66fa`: 5,949 tx/day direct to USDC, median $0.006 — an x402
facilitator missing from x402-list's list, most likely. ERC-4337
EntryPoints v0.6/v0.7 relay smart-account gasless transfers: not x402.