aa527ad0-b42e-474f-a4d9-6ed05a3cbcadIMD JOB

Wrote `artifacts/answer.json` with the average **94218920000000000 wei** across 25 qualifying sales and a self-contained reproduction procedure. Independent decoding matched. The required checker printed `ok`.

I've read the brief and the checks. Plan: fetch `OrderFulfilled` logs for both Seaport contracts over blocks 26019452–26026608 from a public RPC, decode them per the pinned definitions, compute the floor-average price in wei, then write `artifacts/answer.json` and run the checker. Note: the brief pins `"evidence": "panel"`, so the checker will require a `panel` recipe even though the data is on-chain — the computation and reproducibility details go in `definitions`/`notes`. First, let me confirm the OrderFulfilled topic hash and check connectivity:Topic confirmed: `0x9d9af8e38d66c62e2c12f0225249fd9d721c54b83f48d9352c97c6cacdcb6f31`. Now I'll write a scratch scanner that fetches and decodes the logs per the pinned definitions.One complete scan: 12,232 `OrderFulfilled` logs, pin confirmed, 25 qualifying sales (4 listings + 21 bids), sum 2.355473 ETH, floor-average 94,218,920,000,000,000 wei. Now a cheap cross-check of the count and pin on a second operator's endpoint to rule out silent truncation.Both endpoints agree exactly (12,232 logs, 25 sales, same sum and average), and the pinned hash matched on both. Writing the answer — note the `window` key order must match the brief exactly (`toBlock`, `fromBlock`, `toBlockHash`).Done. `artifacts/answer.json` passes the checker's `ok`. **Answer: `94218920000000000` wei** (~0.0942 ETH) average sale price. How it was computed: - Fetched `eth_getLogs` for `OrderFulfilled` (topic `0x9d9af8e3…f31`) emitted by Seaport 1.5 and Seaport 1.6 over exactly blocks 26019452–26026608, closing hash confirmed against the pin on both `ethereum-rpc.publicnode.com` and `rpc.mevblocker.io/fast`. - 12,232 logs decoded; 25 fills qualified per the pinned definitions (4 listing fills, 21 bid fills; the rest excluded for zero/multiple NFTs or a different collection — none excluded for payment token). - Total 2,355,473,000,000,000,000 wei across 25 sales → floor mean `94218920000000000`. Both endpoints produced identical counts and sums. One thing worth noting: the brief declares `"evidence": "panel"`, so the checker requires a `panel` recipe even though the data is on-chain — the recipe names the RPC source URL, and the full on-chain reproduction procedure (event topic, contracts, decode and filter rules) is stated in `definitions` and `notes`.

The average Elemental sale price over the pinned window was **94218920000000000 wei** (about 0.0942 ETH). The answer is in `artifacts/answer.json`, and `check-answer.mjs` prints `ok` for it. **How I got it:** - I pulled every `OrderFulfilled` log (12,232 of them) from Seaport 1.5 and 1.6 over blocks 26019452 to 26026608 inclusive, from `https://ethereum-rpc.publicnode.com`. I requested 500 blocks at a time and would have halved a range the endpoint refused; none were refused. - That endpoint returned chain id 1 and the pinned closing hash `0x8427…3f3f`. A second operator, `https://rpc.mevblocker.io/fast`, returned the same hash. - I decoded the offer and consideration lists with a small Node script in `test/scratch/`, because `scan.mjs` can't read Seaport's nested lists and the collection address isn't a field logs can be filtered by. - 25 fills involved the collection, and all 25 qualified: 4 listing fills paid in ETH or WETH and 21 bid fills paid in WETH. None were bundles, ERC-1155 fills or paid in another token. - The prices add up to 2355473000000000000 wei; divided by 25 and rounded down, that gives the answer. Individual prices ranged from 0.0601 to 0.773 ETH. **Decisions to know about:** - **Recipe kind:** it is `panel`, not a rerunnable chain recipe, because the brief sets `"evidence": "panel"` and the checker refuses anything else. Its `source` names the exact query: endpoint, event topic, both Seaport addresses and the block range. - **Counting:** each qualifying event counts as one sale, so a single transaction that buys several tokens counts several times. I also count ETH and WETH one-to-one. Both choices are written under `definitions`. - **A case that didn't come up:** a matched bid can produce an extra event with no payment attached, which the definitions would score as a zero-price sale. None appeared in this window, so it didn't affect the result. I only ran the scan once, as the reference suggests. I haven't committed anything; `artifacts/answer.json` is left untracked for the daemon to upload.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The average Elemental sale price over blocks 26019452–26026608 is **94218920000000000 wei** (0.09421892 ETH). - **Sales:** 25 qualifying sales summed to 2355473000000000000 wei, rounded down after dividing by 25. - **Scan:** I fetched every `OrderFulfilled` log for Seaport 1.5 and 1.6 over exactly the pinned blocks (12232 logs) from `https://ethereum-rpc.publicnode.com`. The scan is my own script in `test/scratch/avg.mjs`, which is not submitted. - **Definitions:** I applied the brief's sale and price rules as written. `definitions` in the file spells out the listing and bid cases. - **Pin check:** The chain id is 1, and block 26026608 has the pinned hash on both publicnode and `https://rpc.mevblocker.io`. I did not run a second full scan. - **Recipe kind:** The recipe is `panel`, because the brief says `"evidence": "panel"`. The catalogue's `log-sum` and `log-rank` can't filter by collection or decode Seaport's item arrays. The recipe's `source` names the RPC endpoint and the Seaport addresses, and `notes` describes how the figure was computed. `git status` shows nothing to commit, which I assume is because `artifacts/` is ignored. The file is on disk and untracked.

Created [artifacts/answer.json](/Users/peterhucik/.identitymd/work/aa527ad0-b42e-474f-a4d9-6ed05a3cbcad/47041d91-24c3-48bc-805a-f7cd97fd1d76/artifacts/answer.json). Average sale price: `94218920000000000` wei. Validation passed: `ok`.

Created [artifacts/answer.json](/home/imd-worker/.identitymd/work/aa527ad0-b42e-474f-a4d9-6ed05a3cbcad/47041d91-24c3-48bc-805a-f7cd97fd1d76/artifacts/answer.json). Computed average: `94218920000000000` wei across 25 qualifying sales. Validation passed: `ok`.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The average Elemental sale price over blocks 26019452 to 26026608 is **94218920000000000 wei**. - **Scan:** I decoded 12,232 OrderFulfilled logs from Seaport 1.5 and 1.6 over the pinned range. The closing block hash and chain id matched the pin on `https://ethereum-rpc.publicnode.com`, the only endpoint I used. I skipped the cheap second-operator hash check. - **Result:** 25 sales qualified under the definitions. Their prices sum to 2355473000000000000 wei, which divides down to the figure above. - **Recipe kind:** The brief says `"evidence": "panel"`, so the recipe is the `panel` kind with a source URL rather than one of the chain recipes. The source names the endpoint, topic, contracts and block range. - **Script:** I used my own decoder in `test/scratch/s.mjs`, not `scan.mjs`. `scan.mjs` can't decode the Seaport item arrays. The scratch script is not submitted.

Created [artifacts/answer.json](/home/imd/.identitymd/work/aa527ad0-b42e-474f-a4d9-6ed05a3cbcad/47041d91-24c3-48bc-805a-f7cd97fd1d76/artifacts/answer.json). Average sale price: `94218920000000000` wei. The supplied checker prints `ok`.

Wrote `artifacts/answer.json`: **94,218,920,000,000,000 wei**, averaged across 25 qualifying sales. Included the reproduction procedure. The required validator printed `ok`.

Created [artifacts/answer.json](/root/.identitymd/work/aa527ad0-b42e-474f-a4d9-6ed05a3cbcad/47041d91-24c3-48bc-805a-f7cd97fd1d76/artifacts/answer.json). Average sale price: `94218920000000000` wei. Validation passed: `check-answer.mjs` printed `ok`.

Completed `artifacts/answer.json`. Computed result: `94218920000000000` wei. Verification passed: ```text node .imd/reads/skills/oracle-assess/scripts/check-answer.mjs artifacts/answer.json .imd/reads/oracle.json ok ```

The average sale price of Elemental over blocks 26019452–26026608 is **94218920000000000 wei**, about 0.0942 ETH. `artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. - **How I computed it:** I pulled the Seaport `OrderFulfilled` logs from both Seaport 1.5 and 1.6 over exactly the pinned blocks, from `ethereum-rpc.publicnode.com`, and decoded them with the Seaport ABI. The chain id is 1, and the closing block hash matches the pin on two operators (publicnode and `rpc.flashbots.net/fast`). - **Result:** Of 12,232 fills in the window, 25 involved the collection, and all 25 qualified. There were no bundles, no other-NFT fills, and none paid in other tokens. Four were listing fills and 21 were bid fills, spread over 16 transactions. The total is 2,355,473,000,000,000,000 wei, which divides by 25 with no remainder. - **Choices I recorded under `definitions`:** each log counts as its own sale, even when one transaction emits several; a listing's price is the sum of all consideration items; a bid's price is its offer amount. - **Recipe kind:** the brief says `"evidence": "panel"`, so the checker only accepts a `panel` recipe. That recipe can't be rerun. I put the RPC URL as its `source` and described the full method in `notes`. - **Scratch script:** the decoder is in `test/scratch/seaport.mjs`, which is not submitted.

Created [artifacts/answer.json](artifacts/answer.json) with the reproduction procedure. Average: **94,218,920,000,000,000 wei** across **25 qualifying sales**. Required validator printed `ok`.

**94218920000000000 wei** (≈0.09422 ETH) — 25 qualifying Seaport fills of Elemental, sum 2355473000000000000 wei, over blocks 26019452–26026608. `node .imd/reads/skills/oracle-assess/scripts/check-answer.mjs artifacts/answer.json .imd/reads/oracle.json` prints **ok**.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. **Answer: 94218920000000000 wei** (0.09421892 ETH) — the mean of 25 qualifying Seaport fills, sum 2355473000000000000 wei. How it was computed, over exactly blocks 26019452–26026608: - Pin confirmed twice: `eth_chainId` = 1 and block 26026608 = `0x84272223…bf3f` on `https://rpc.flashbots.net/fast`, and the same hash re-read on `https://ethereum-rpc.publicnode.com` (different operator). `scan.mjs --pin` reported `pinned: true`, 32 logs. - Seaport indexes only `offerer` and `zone`, so the collection can't be a topic filter. Candidates came from the 32 ERC-721 `Transfer` logs of `0xb6a3…786e` in the window → 23 transactions; their receipts held 25 `OrderFulfilled` events from the two Seaport contracts. Seaport always transfers the item it settles, so that superset loses nothing. `scan.mjs` can only sum a fixed data word, so the `SpentItem`/`ReceivedItem` arrays were decoded with a small dependency-free script in `test/scratch/`; decoding was spot-checked against three events (fee legs reconcile to 1% OpenSea + 5% creator). - All 25 qualified — 21 bid fills (offer = WETH, NFT in consideration → price = offer amount) and 4 listing fills (offer = the NFT, consideration all ETH/WETH → price = sum of consideration). All were Seaport 1.6; 1.5 emitted none. Nothing was dropped for a foreign payment token, a bundle, or an ERC-1155 item. 2355473000000000000 / 25 divides exactly, so rounding down changed nothing. One judgement call, stated in `definitions` and `notes`: block 26019872 (Elemental #682) settled via `matchOrders` and emitted **two** qualifying events for one economic trade. The brief defines a sale as an `OrderFulfilled` event, so both are counted. Deduplicating that pair would give 24 sales and 95558333333333333 wei — the figure is in `notes` so a reader can reconcile if the panel lands there instead. The recipe is `{ kind: "panel", source }` because the brief sets `"evidence": "panel"` — `check-answer.mjs` rejects any chain recipe for such a brief, and no `log-sum` shape could decode Seaport's item arrays anyway. The `source` names the endpoint and the exact call sequence so the deployer can rerun it.

The average sale price of Elemental over blocks 26019452 to 26026608 was 94218920000000000 wei (0.09421892 ETH). `check-answer.mjs` prints `ok` for `artifacts/answer.json`, which is the only file I wrote outside `test/scratch/`. - **Sales:** 25 Seaport 1.5/1.6 fills of exactly one Elemental ERC-721 qualified, and none were excluded on shape or payment token. Their prices, fees included, sum to 2355473000000000000 wei, which I divided by 25 and rounded down. - **Scan:** `scan.mjs` can't decode `OrderFulfilled`, so I used my own script in `test/scratch/`. `OrderFulfilled` doesn't index the collection, so I took every log the Elemental contract emitted in the window, fetched those transaction receipts and decoded the Seaport events from them. Any Seaport fill of an ERC-721 must emit a transfer from the collection, so this should find the same fills as a full scan. - **Endpoint:** Only `https://ethereum-rpc.publicnode.com` was read. It returned chain id 1 and the pinned closing block hash. I did not cross-check the hash on a second endpoint. - **Recipe:** The brief says `"evidence": "panel"`, and the check rejects any other recipe kind for a panel brief, so the recipe is `panel` with the RPC endpoint as its source. Nothing in the catalogue can rerun a Seaport decode, so the deployer can't reproduce this from the recipe itself. The method and the full definitions are in `notes` and `definitions`.

Created [artifacts/answer.json](artifacts/answer.json) with the reproducible calculation. Average: **94,218,920,000,000,000 wei** across **25 sales**. Required checker printed `ok`.

`artifacts/answer.json` is written, and `check-answer.mjs` prints `ok` for it. **Answer: 94218920000000000 wei** (about 0.0942 ETH). That is 2,355,473,000,000,000,000 wei summed over 25 qualifying sales, rounded down. - **How it was computed:** I fetched all 12,232 `OrderFulfilled` logs from Seaport 1.5 and 1.6 over blocks 26019452–26026608 from `https://ethereum-rpc.publicnode.com`. I decoded the offer and consideration items and kept fills with exactly one NFT, an ERC-721 of the Elemental contract, priced under your definitions. The endpoint returned chain 1 and the pinned closing block hash `0x84272223…bf3f`. I did not cross-check the hash on a second endpoint. `scan.mjs` can't decode Seaport's nested item arrays, so I used my own script (`test/scratch/run.mjs`, not submitted). - **Recipe:** the brief says `"evidence": "panel"`, and the checker only accepts a `panel` recipe for that. The recipe's `source` is the RPC endpoint plus the Seaport addresses and event topic. It names the data, but it is not something the deployer can rerun mechanically. `notes` describes the actual computation. - **Exclusions:** none of the matching fills were dropped for being paid in a token other than ETH or WETH.

Created `artifacts/answer.json` with the average **94,218,920,000,000,000 wei** across 25 qualifying sales and RPC reproduction code. Required checker printed `ok`.

The average Elemental sale on OpenSea over blocks 26019452–26026608 was **94218920000000000 wei** (about 0.0942 ETH). The answer is in `artifacts/answer.json`, and `check-answer.mjs` prints `ok` for it. - **How it was computed:** I pulled every Seaport 1.5 and 1.6 `OrderFulfilled` log over exactly the pinned blocks, 12,232 logs in total, and decoded their offer and consideration items with a small script of my own in `test/scratch/`. I didn't use `scan.mjs` for the scan because it can only count and sum raw log fields, not decode those items. Before scanning I confirmed the chain id (1) and the pinned closing block hash. - **Result:** 25 fills involved the collection, and all 25 qualified: each was exactly one ERC-721 token paid only in ETH or WETH, so none were excluded. The prices add up to 2355473000000000000 wei, and that divides by 25 exactly, so rounding down changes nothing. Prices ranged from 0.0601 to 0.773 ETH. - **Sweeps:** several transactions filled more than one order (sweeps). I counted each `OrderFulfilled` event as its own sale, and wrote that under `definitions`. - **Recipe:** it's `{kind: "panel", source}`, because the brief marks this as a panel-evidence question and the checker only accepts that kind here. The source URL points to the Seaport event log on Etherscan. The exact scan steps are in `notes`. - **Endpoints:** `ethereum-rpc.publicnode.com` refused because it needs a token for older blocks, so the scan ran on `rpc.mevblocker.io`. I did not check the closing hash on a second provider, which the reference suggests. The answer file is not committed, as the instructions require.

`artifacts/answer.json` is written, and `check-answer.mjs` prints `ok`. The average sale price of Elemental over blocks 26019452 to 26026608 is **94218920000000000 wei**, about 0.0942 ETH. - **Sales:** 25 qualified, 4 listing fills and 21 bid fills. Together they came to 2355473000000000000 wei, which is the `figure`. - **How I got there:** I pulled all 12,232 Seaport 1.5 and 1.6 OrderFulfilled logs for the pinned range from `https://ethereum-rpc.publicnode.com` and decoded them with my own script. I applied the definitions in `oracle.json` as written, and the tally found no duplicate logs. - **Pin check:** `eth_chainId` returned 1, and the hash of block 26026608 matches the pinned closing hash. I did not check the hash on a second operator's endpoint, which the reference suggests doing cheaply. - **Recipe kind:** the brief pins `"evidence": "panel"`, so the recipe has to be `panel` with a `source` URL. I put the RPC endpoint and the event details in `source`, and the full method is in `notes`. - **Not run:** I did not use `scan.mjs` for the figure. It only sums or ranks raw log words and cannot decode Seaport's nested offer and consideration items. I used it only to compute the event topic. The scratch script is in `test/scratch/`, which is not submitted, and the git status is clean apart from the untracked answer file.

Created `artifacts/answer.json` with the reproduction procedure. Average: **94,218,920,000,000,000 wei** across **25 qualifying sales**. Required validator printed `ok`.

I wrote `artifacts/answer.json`. The average sale price of Elemental over blocks 26019452 to 26026608 is **94218920000000000 wei** (0.09421892 ETH), and `check-answer.mjs` prints `ok` for it. - **Sales:** I scanned 12,232 `OrderFulfilled` logs from Seaport 1.5 and 1.6. 25 were single-ERC-721 fills of the collection, all priced in ETH or WETH. None had to be excluded for another payment token. - **Sum:** the prices add up to 2355473000000000000 wei. That figure is 25 × the average, and it is stored as `figure`. - **Pinned range:** the closing block hash matched the pin on publicnode. - **Recipe kind:** the brief says panel evidence, so the checker only accepts a `panel` recipe. Its `source` is the publicnode endpoint with the event topic and block range. The `notes` field also names nodereal and mevblocker, which I used as fallbacks. - **Method:** the catalogue has no averaging recipe and the scan script can't decode Seaport's nested arrays. I therefore used my own Node script in `test/scratch/`, which is not submitted.

Created [artifacts/answer.json](/home/worker/.identitymd/work/aa527ad0-b42e-474f-a4d9-6ed05a3cbcad/47041d91-24c3-48bc-805a-f7cd97fd1d76/artifacts/answer.json). Average sale price: `94218920000000000` wei. Validation passed: `check-answer.mjs` printed `ok`.

`artifacts/answer.json` is written and passes the checker (`ok`, exit 0). **Answer: 94218920000000000 wei** (≈ 0.09421892 ETH) — the mean of 25 qualifying fills summing to 2355473000000000000 wei. How it was computed: - Fetched every `OrderFulfilled` log (topic0 `0x9d9af8…6f31`) on Seaport 1.5 and 1.6 over exactly blocks 26019452–26026608 in 200-block chunks — 12,232 logs, no chunk refused or halved — and decoded the two dynamic arrays (`SpentItem[] offer`, `ReceivedItem[] consideration`) with a dependency-free Node script in `test/scratch/`. - `eth_chainId` = 1 and the closing block hash matched the pin `0x84272223…bf3f`. - 25 logs name the collection anywhere in their data, and all 25 qualified — none dropped for a bundle, an ERC-1155 leg, or a non-ETH/WETH payment. 21 bid fills, 4 listing fills; low 0.0601 ETH, high 0.773 ETH. 2355473000000000000 ÷ 25 divides exactly, so the floor changed nothing. Cross-checks: the same full scan on a second operator (`ethereum-rpc.publicnode.com`) returned identical counts, sum and mean, so neither read was truncated; and re-decoding only the 23 blocks that carry an ERC-721 `Transfer` of the collection (32 transfers) reproduces exactly the same 25 sales. Two things the brief left open are stated under `definitions` and applied consistently: every Seaport fill counts as an OpenSea sale (the brief's `sale` definition names only the two contracts, no zone or fee-recipient filter), and each qualifying `OrderFulfilled` is one sale — one token (id 682, block 26019872) was filled twice in a single transaction by two different orders and is counted twice; `notes` gives the figure the alternative would produce. The recipe is `{ kind: "panel", source }`, which the brief's `"evidence": "panel"` requires and the checker enforces. `notes` explains why no chain recipe in the catalogue can express this: `log-sum` adds one fixed data word, while this figure needs the offer/consideration arrays decoded per fill and a mean rather than a sum.

Created [artifacts/answer.json](artifacts/answer.json). Average: **94,218,920,000,000,000 wei** across **25 sales**. The included reproduction script returned the same result, and `check-answer.mjs` printed `ok`.

The average Elemental sale price over blocks 26019452–26026608 was **94218920000000000 wei** (about 0.0942 ETH). `artifacts/answer.json` is written, and `check-answer.mjs` prints `ok` for it. - **Sales:** 25 qualified out of 12,232 Seaport `OrderFulfilled` logs in the window. 4 were listing fills and 21 were bid fills. None were excluded for non-ETH/WETH payment. - **Total:** the 25 prices sum to 2355473000000000000 wei, which is the `figure` in the file. - **How I computed it:** I pulled every `OrderFulfilled` log from Seaport 1.5 and 1.6 over exactly the pinned blocks. The RPC was `https://ethereum-rpc.publicnode.com`. I decoded the offer and consideration arrays and applied the request's definitions of a sale and its price. The `definitions` field in the file states them. - **Pin check:** the chain id is 1, and block 26026608 has the pinned hash on both publicnode and `https://rpc.flashbots.net/fast`. - **Custom decoder:** the provided `scan.mjs` can't decode Seaport's nested arrays, so I used my own script in `test/scratch/sales.mjs`. I ran the full scan once and did not repeat it on a second endpoint. - **Recipe kind:** the request has `"evidence": "panel"`, and the checker only accepts a `panel` recipe for that. The recipe source is therefore the RPC URL and the log filter, and the `notes` field describes the actual method.

Created [artifacts/answer.json](</Users/zhuminquan/.identitymd-2/work/aa527ad0-b42e-474f-a4d9-6ed05a3cbcad/47041d91-24c3-48bc-805a-f7cd97fd1d76/artifacts/answer.json>) with the computed average and recipe. Official checker output: `ok`.

Created [artifacts/answer.json](artifacts/answer.json). Average: **94,218,920,000,000,000 wei** across **25 sales**. The included procedure reproduced the result, and the required validator printed `ok`.

Created [artifacts/answer.json](artifacts/answer.json) with **94218920000000000 wei**, averaged across 25 qualifying sales, and reproduction code. The required validator printed `ok`.

Created `artifacts/answer.json` with **94218920000000000 wei**, averaged over 25 qualifying sales, plus definitions and reproduction code. Required checker: `ok`.

Completed [artifacts/answer.json](/home/imd-worker2/.identitymd/work/aa527ad0-b42e-474f-a4d9-6ed05a3cbcad/47041d91-24c3-48bc-805a-f7cd97fd1d76/artifacts/answer.json). Average sale price: `94218920000000000` wei. Validator result: `ok`.

`ok`, exit 0. The answer file is untracked, as required. **Answer: 94218920000000000 wei** (≈0.0942 ETH) average Elemental sale price on Seaport over blocks 26019452–26026608. How it was derived: - **Pin confirmed** (chain id 1 + closing hash `0x8427…bf3f`) on four independent operators: publicnode, valve.city, nodereal, drpc. `rpc.flashbots.net` and `eth.merkle.io` refuse `eth_getLogs` and were dropped. - **Candidate narrowing**: 32 `Transfer` logs from `0xb6a3…786e` in the window across 23 blocks. Since a Seaport ERC-721 fill always emits the collection's `Transfer` in the same tx, those 23 blocks are a complete superset — nothing is missed. - **Seaport decode**: 69 `OrderFulfilled` logs from 1.5 + 1.6 in those blocks; 25 carry an item of the collection. All 25 qualified (exactly one NFT item, itemType 2, paid wholly in ETH/WETH) — no bundles, no ERC-1155, no foreign currency, no unsupported offer shape. 21 bid fills, 4 listing fills. - **Sum** = 2355473000000000000 wei; ÷ 25 = 94218920000000000 exactly, so the floor is a no-op. Prices ran 0.0601–0.773 ETH, bulk at 0.060–0.077 (floor ~0.06 with one outlier pulling the mean above the median). - Full recomputation on a second operator (valve.city) returned identical counts and totals. Two things worth flagging in how I read the brief: 1. **The brief says `"evidence": "panel"`**, and `check-answer.mjs` enforces that a panel-evidence brief takes only a `{kind: "panel", source}` recipe — so that is what I wrote, with the RPC endpoint and the exact `eth_getLogs` filter as the source. This is also the only workable option on the merits: `OrderFulfilled` carries the price inside two dynamic arrays, so no fixed data word is the price, the collection can't be filtered by topic, and an average isn't a sum — no `log-sum`/`log-rank` recipe can express this figure. 2. **Definitions I had to fix and stated in the file**: "OpenSea" is taken as the brief's `sale` definition literally (any Seaport 1.5/1.6 fill, no fee-recipient or zone filter); a listing fill requires the offer to be exactly one item that is the NFT, a bid fill exactly one money item with the NFT in consideration, and any other offer shape is excluded (there were none); the floor is applied once at the end, not per sale.

Created [artifacts/answer.json](artifacts/answer.json) with the reproducible calculation. Average: **94,218,920,000,000,000 wei** across 25 sales. Embedded reproduction replay passed; required checker printed `ok`.