# CHEOPS (McGrath) CHEOPS Status: LIVE Price: $0.005 USDC `GET /api/calc/cheops` HTML: https://magentlab.com/docs/cheops Markdown: https://magentlab.com/docs/cheops.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Sum six caller-assigned McGrath 1985 CHEOPS category integers and return the published total (range 4-13). ## When to use When an agent has already assigned McGrath 1985 CHEOPS integers for cry, facial, child_verbal, torso, touch, and legs and needs the published total, not a pain diagnosis, analgesic order, FLACC, BOPS, or an invented treatment-threshold cutoff. ## When not to use - Not a medical device and not a pain diagnosis or analgesic order. - Each of the six categories is a caller-assigned integer from the McGrath 1985 table. magent does not observe the child. - Cry is 1, 2, or 3 (0 is not published). Facial and child_verbal are 0, 1, or 2. Torso, touch, and legs are 1 or 2 (0 is not published). Both-complaints maps to child_verbal 2; there is no published verbal 3. - Published total is 4 (no pain) to 13 (worst pain). magent does not emit later treatment-threshold cutoffs. - McGrath 1985 described postoperative pain rating in children. magent does not take an age parameter. Not FLACC. Not BOPS. ## Formula ``` CHEOPS = cry + facial + child_verbal + torso + touch + legs; McGrath 1985 published integers; min 4, max 13 ``` ## Citation [CHEOPS: a behavioral scale for rating postoperative pain in children](https://doi.org/10.1016/0304-3959(84)90167-2) McGrath PJ, Johnson G, Goodman JT, Schillinger J, Dunn J, Chapman J In: Fields HL, ed. Advances in Pain Research and Therapy. Vol 9. New York: Raven Press; 1985:395-402 DOI: [10.1016/0304-3959(84)90167-2](https://doi.org/10.1016/0304-3959(84)90167-2) ## Worked example ### Published no-pain minimum Given: `child_verbal=0, cry=1, facial=0, legs=1, torso=1, touch=1` 1. cry 1 + facial 0 + child_verbal 0 + torso 1 + touch 1 + legs 1 2. Score = 4 (published minimum; max 13) ### All category maxima Given: `child_verbal=2, cry=3, facial=2, legs=2, torso=2, touch=2` 1. cry 3 + facial 2 + child_verbal 2 + torso 2 + touch 2 + legs 2 2. Score = 13 (published maximum) ## Also searched as - CHEOPS - Children's Hospital of Eastern Ontario Pain Scale - McGrath CHEOPS - CHEOPS scale - postoperative pain children - McGrath 1985 CHEOPS - behavioral pain children - CHEOPS cry facial verbal ## Parameters - `cry` (integer, required): Caller-assigned McGrath 1985 CHEOPS cry (integer 1-3; 0 is not published): 1 no crying; 2 moaning or crying; 3 scream. magent does not observe the child. - `facial` (integer, required): Caller-assigned McGrath 1985 CHEOPS facial (integer 0-2): 0 smiling; 1 composed/neutral; 2 grimace. magent does not observe the child. - `child_verbal` (integer, required): Caller-assigned McGrath 1985 CHEOPS child verbal (integer 0-2): 0 positive statements; 1 none or other non-pain complaints; 2 pain complaints (both-complaints also 2; there is no published 3). magent does not observe the child. - `torso` (integer, required): Caller-assigned McGrath 1985 CHEOPS torso (integer 1-2; 0 is not published): 1 neutral/resting; 2 shifting, tense, shivering, upright, or restrained. magent does not observe the child. - `touch` (integer, required): Caller-assigned McGrath 1985 CHEOPS touch (integer 1-2; 0 is not published): 1 not touching wound; 2 reaching, touching, grabbing, or arms restrained. magent does not observe the child. - `legs` (integer, required): Caller-assigned McGrath 1985 CHEOPS legs (integer 1-2; 0 is not published): 1 neutral; 2 squirm/kicking, drawn up/tense, standing, or restrained. magent does not observe the child. ## Bulk (POST) POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement. Method: `POST /api/calc/cheops` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: PREVIEW - 1 to 25 items. Each item uses the same keys as the GET query parameters. - POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows. - The first invalid item fails the whole request (index in the 400 JSON). You are not charged. - HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row. - Catalog misses (empty matches, found=false) stay paid 200s inside that slot. - x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items. Example request: ```json { "items": [ { "child_verbal": "0", "cry": "1", "facial": "0", "legs": "1", "torso": "1", "touch": "1" }, { "child_verbal": "0", "cry": "1", "facial": "0", "legs": "1", "torso": "1", "touch": "1" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/cheops Example 200: ```json { "count": 2, "path": "/api/calc/cheops", "items": [ { "components": [ { "value": 1, "factor": "cry", "points": 1, "present": true }, { "value": 0, "factor": "facial", "points": 0, "present": true }, { "value": 0, "factor": "child_verbal", "points": 0, "present": true }, { "value": 1, "factor": "torso", "points": 1, "present": true }, { "value": 1, "factor": "touch", "points": 1, "present": true }, { "value": 1, "factor": "legs", "points": 1, "present": true } ], "touch": 1, "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "McGrath PJ, Johnson G, Goodman JT, Schillinger J, Dunn J, Chapman J", "doi": "10.1016/0304-3959(84)90167-2", "id": "mcgrath-1985", "source": "In: Fields HL, ed. Advances in Pain Research and Therapy. Vol 9. New York: Raven Press; 1985:395-402", "title": "CHEOPS: a behavioral scale for rating postoperative pain in children" }, "formula": "cheops", "formula_expression": "CHEOPS = cry + facial + child_verbal + torso + touch + legs; McGrath 1985 published integers; min 4, max 13", "max_score": 13, "score": 4, "child_verbal": 0, "cry": 1, "facial": 0, "legs": 1, "torso": 1 }, { "components": [ { "value": 1, "factor": "cry", "points": 1, "present": true }, { "value": 0, "factor": "facial", "points": 0, "present": true }, { "value": 0, "factor": "child_verbal", "points": 0, "present": true }, { "value": 1, "factor": "torso", "points": 1, "present": true }, { "value": 1, "factor": "touch", "points": 1, "present": true }, { "value": 1, "factor": "legs", "points": 1, "present": true } ], "touch": 1, "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "McGrath PJ, Johnson G, Goodman JT, Schillinger J, Dunn J, Chapman J", "doi": "10.1016/0304-3959(84)90167-2", "id": "mcgrath-1985", "source": "In: Fields HL, ed. Advances in Pain Research and Therapy. Vol 9. New York: Raven Press; 1985:395-402", "title": "CHEOPS: a behavioral scale for rating postoperative pain in children" }, "formula": "cheops", "formula_expression": "CHEOPS = cry + facial + child_verbal + torso + touch + legs; McGrath 1985 published integers; min 4, max 13", "max_score": 13, "score": 4, "child_verbal": 0, "cry": 1, "facial": 0, "legs": 1, "torso": 1 } ] } ``` ## Response fields - `formula` (string): cheops - `formula_expression` (string): Exact expression used - `score` (integer): CHEOPS points 4-13 - `max_score` (integer): Always 13 - `cry` (integer): Caller-assigned cry points 1-3 - `facial` (integer): Caller-assigned facial points 0-2 - `child_verbal` (integer): Caller-assigned child verbal points 0-2 - `torso` (integer): Caller-assigned torso points 1-2 - `touch` (integer): Caller-assigned touch points 1-2 - `legs` (integer): Caller-assigned legs points 1-2 - `components` (array): Per-category caller-assigned points - `citation` (object): McGrath et al. 1985 CHEOPS chapter citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "value": 1, "factor": "cry", "points": 1, "present": true }, { "value": 0, "factor": "facial", "points": 0, "present": true }, { "value": 0, "factor": "child_verbal", "points": 0, "present": true }, { "value": 1, "factor": "torso", "points": 1, "present": true }, { "value": 1, "factor": "touch", "points": 1, "present": true }, { "value": 1, "factor": "legs", "points": 1, "present": true } ], "touch": 1, "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "citation": { "authors": "McGrath PJ, Johnson G, Goodman JT, Schillinger J, Dunn J, Chapman J", "doi": "10.1016/0304-3959(84)90167-2", "id": "mcgrath-1985", "source": "In: Fields HL, ed. Advances in Pain Research and Therapy. Vol 9. New York: Raven Press; 1985:395-402", "title": "CHEOPS: a behavioral scale for rating postoperative pain in children" }, "formula": "cheops", "formula_expression": "CHEOPS = cry + facial + child_verbal + torso + touch + legs; McGrath 1985 published integers; min 4, max 13", "max_score": 13, "score": 4, "child_verbal": 0, "cry": 1, "facial": 0, "legs": 1, "torso": 1 } ``` ## Errors - HTTP 400 `invalid_cheops`: CHEOPS needs cry, facial, child_verbal, torso, touch, and legs (McGrath 1985). Returned before settlement; you are not charged. - HTTP 400 `invalid_cheops_item`: each CHEOPS category must be an integer in that category's published range (McGrath 1985). Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [FLACC](https://magentlab.com/docs/flacc) — Sum five caller-assigned Merkel 1997 FLACC integers (0-2) and return the published total (max 10). - [BOPS](https://magentlab.com/docs/bops) — Sum three caller-assigned Hesselgard 2007 BOPS integers (0-2) and return the published total (max 6). ## Payment Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/docs/mcp ## Guarantees - HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON. - exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE. - HTTP 402 is unpaid only. Do not sign a second authorization because of a 503. - Execution is timeout-bounded and concurrency-capped. - Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.