# mMRC dyspnea grade (Mahler 1988) mMRC Status: LIVE Price: $0.005 USDC `GET /api/calc/mmrc` HTML: https://magentlab.com/docs/mmrc Markdown: https://magentlab.com/docs/mmrc.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Return the Mahler 1988 modified Medical Research Council (mMRC) dyspnea grade 0-4 from a caller-assigned integer, with the published grade wording. ## When to use When an agent needs the modified MRC 0-4 grade and must not invent GOLD ABE groups, a BODE index, or Bestall MRC grades 1-5. ## When not to use - Not a medical device and not a diagnosis. magent does not examine the patient. - The caller assigns mMRC 0-4. magent does not interview the patient or apply a GOLD ABE group. - This is the modified MRC 0-4 scale (Mahler 1988). It is not Bestall MRC grades 1-5 and is not a BODE index. ## Formula ``` modified MRC (mMRC) grade 0-4 as assigned by the caller; Mahler 1988 (not Bestall MRC 1-5) ``` ## Citation [Evaluation of clinical methods for rating dyspnea](https://doi.org/10.1378/chest.93.3.580) Mahler DA, Wells CK Chest. 1988;93(3):580-586 DOI: [10.1378/chest.93.3.580](https://doi.org/10.1378/chest.93.3.580) ## Worked example ### Grade 0 strenuous exercise only Given: `mmrc=0` 1. mmrc 0 → breathless only with strenuous exercise; score 0; max 4 ## Also searched as - mMRC - modified MRC - modified Medical Research Council - mMRC dyspnea scale - Mahler dyspnea grade - MRC dyspnea 0-4 - breathlessness grade - modified MRC grade ## Parameters - `mmrc` (integer, required): Mahler 1988 modified MRC dyspnea grade 0-4 as assigned by the caller (0 breathless only with strenuous exercise; 1 short of breath when hurrying on the level or walking up a slight hill; 2 walks slower than people of the same age on the level because of breathlessness, or has to stop for breath when walking at own pace on the level; 3 stops for breath after walking about 100 yards or after a few minutes on the level; 4 too breathless to leave the house, or breathless when dressing or undressing). Not Bestall MRC 1-5. magent does not examine the patient. ## 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/mmrc` 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": [ { "mmrc": "0" }, { "mmrc": "0" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/mmrc Example 200: ```json { "count": 2, "path": "/api/calc/mmrc", "items": [ { "description": "Breathless only with strenuous exercise", "components": [ { "factor": "mmrc", "points": 0, "present": true } ], "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": "Mahler DA, Wells CK", "doi": "10.1378/chest.93.3.580", "id": "mahler-1988", "pmid": "3342669", "source": "Chest. 1988;93(3):580-586", "title": "Evaluation of clinical methods for rating dyspnea" }, "formula": "mmrc", "formula_expression": "modified MRC (mMRC) grade 0-4 as assigned by the caller; Mahler 1988 (not Bestall MRC 1-5)", "max_score": 4, "score": 0, "mmrc": 0 }, { "description": "Breathless only with strenuous exercise", "components": [ { "factor": "mmrc", "points": 0, "present": true } ], "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": "Mahler DA, Wells CK", "doi": "10.1378/chest.93.3.580", "id": "mahler-1988", "pmid": "3342669", "source": "Chest. 1988;93(3):580-586", "title": "Evaluation of clinical methods for rating dyspnea" }, "formula": "mmrc", "formula_expression": "modified MRC (mMRC) grade 0-4 as assigned by the caller; Mahler 1988 (not Bestall MRC 1-5)", "max_score": 4, "score": 0, "mmrc": 0 } ] } ``` ## Response fields - `formula` (string): mmrc - `formula_expression` (string): Published grade rule - `mmrc` (integer): Caller-assigned modified MRC grade 0-4 - `score` (integer): Same as mmrc - `max_score` (integer): 4 - `description` (string): Mahler 1988 wording for that grade - `components` (array): mmrc component - `citation` (object): Mahler and Wells 1988 - `disclaimer` (string): Not a medical device ## Example JSON Frozen fixture. Not a live lookup. ```json { "description": "Breathless only with strenuous exercise", "components": [ { "factor": "mmrc", "points": 0, "present": true } ], "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": "Mahler DA, Wells CK", "doi": "10.1378/chest.93.3.580", "id": "mahler-1988", "pmid": "3342669", "source": "Chest. 1988;93(3):580-586", "title": "Evaluation of clinical methods for rating dyspnea" }, "formula": "mmrc", "formula_expression": "modified MRC (mMRC) grade 0-4 as assigned by the caller; Mahler 1988 (not Bestall MRC 1-5)", "max_score": 4, "score": 0, "mmrc": 0 } ``` ## Errors - HTTP 400 `invalid_mmrc`: mmrc must be an integer from 0 to 4. 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 - [BODE](https://magentlab.com/docs/bode) — Sum Celli 2004 BODE points from BMI, FEV1 percent predicted, MMRC dyspnea, and 6-minute walk distance. ## 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.