# NYHA functional classification (1994) NYHA Status: LIVE Price: $0.005 USDC `GET /api/calc/nyha` HTML: https://magentlab.com/docs/nyha Markdown: https://magentlab.com/docs/nyha.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Return the 1994 NYHA functional capacity class 1-4 from a caller-assigned integer, with the published class description. ## When to use When an agent already has a NYHA functional class 1-4 as in the 1994 9th edition and must not invent Objective Assessment A-D or ACC/AHA stages. ## When not to use - Not a medical device and not a heart-failure diagnosis. magent does not examine the patient. - The caller assigns NYHA class 1-4. magent does not interview or examine the patient. - Functional capacity I-IV only (1994 9th edition). It does not implement Objective Assessment A-D or ACC/AHA stages. ## Formula ``` NYHA functional capacity class 1-4 as assigned by the caller (Criteria Committee of the New York Heart Association 1994 9th edition); not Objective Assessment A-D ``` ## Citation [Nomenclature and Criteria for Diagnosis of Diseases of the Heart and Great Vessels](https://www.worldcat.org/oclc/29430883) The Criteria Committee of the New York Heart Association 9th ed. Boston: Little, Brown & Co; 1994. p. 253-256 DOI: none ## Worked example ### Class 1 no limitation Given: `nyha_class=1` 1. nyha_class 1 → no limitation of ordinary activity; score 1; max 4 ## Also searched as - NYHA class - NYHA classification - NYHA functional classification - New York Heart Association class - heart failure functional class - NYHA 1994 - NYHA I II III IV - functional capacity NYHA ## Parameters - `nyha_class` (integer, required): NYHA 1994 functional capacity class 1-4 as assigned by the caller (1 no limitation of ordinary activity; 2 slight limitation, comfortable at rest, ordinary activity causes symptoms; 3 marked limitation, less than ordinary activity causes symptoms; 4 inability to carry on any physical activity without discomfort, symptoms may be present at rest). 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/nyha` 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": [ { "nyha_class": "1" }, { "nyha_class": "1" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/nyha Example 200: ```json { "count": 2, "path": "/api/calc/nyha", "items": [ { "description": "Patients with cardiac disease but without resulting limitation of physical activity. Ordinary physical activity does not cause undue fatigue, palpitation, dyspnea, or anginal pain.", "components": [ { "factor": "nyha_class", "points": 1, "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": "The Criteria Committee of the New York Heart Association", "id": "nyha-1994", "source": "9th ed. Boston: Little, Brown & Co; 1994. p. 253-256", "title": "Nomenclature and Criteria for Diagnosis of Diseases of the Heart and Great Vessels" }, "formula": "nyha", "formula_expression": "NYHA functional capacity class 1-4 as assigned by the caller (Criteria Committee of the New York Heart Association 1994 9th edition); not Objective Assessment A-D", "max_score": 4, "score": 1, "nyha_class": 1 }, { "description": "Patients with cardiac disease but without resulting limitation of physical activity. Ordinary physical activity does not cause undue fatigue, palpitation, dyspnea, or anginal pain.", "components": [ { "factor": "nyha_class", "points": 1, "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": "The Criteria Committee of the New York Heart Association", "id": "nyha-1994", "source": "9th ed. Boston: Little, Brown & Co; 1994. p. 253-256", "title": "Nomenclature and Criteria for Diagnosis of Diseases of the Heart and Great Vessels" }, "formula": "nyha", "formula_expression": "NYHA functional capacity class 1-4 as assigned by the caller (Criteria Committee of the New York Heart Association 1994 9th edition); not Objective Assessment A-D", "max_score": 4, "score": 1, "nyha_class": 1 } ] } ``` ## Response fields - `formula` (string): nyha - `formula_expression` (string): Published class rule - `nyha_class` (integer): Caller-assigned class 1-4 - `score` (integer): Same as nyha_class - `max_score` (integer): 4 - `description` (string): 1994 functional-capacity wording for that class - `components` (array): NYHA-class component - `citation` (object): NYHA 1994 9th edition - `disclaimer` (string): Not a medical device ## Example JSON Frozen fixture. Not a live lookup. ```json { "description": "Patients with cardiac disease but without resulting limitation of physical activity. Ordinary physical activity does not cause undue fatigue, palpitation, dyspnea, or anginal pain.", "components": [ { "factor": "nyha_class", "points": 1, "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": "The Criteria Committee of the New York Heart Association", "id": "nyha-1994", "source": "9th ed. Boston: Little, Brown & Co; 1994. p. 253-256", "title": "Nomenclature and Criteria for Diagnosis of Diseases of the Heart and Great Vessels" }, "formula": "nyha", "formula_expression": "NYHA functional capacity class 1-4 as assigned by the caller (Criteria Committee of the New York Heart Association 1994 9th edition); not Objective Assessment A-D", "max_score": 4, "score": 1, "nyha_class": 1 } ``` ## Errors - HTTP 400 `invalid_nyha`: nyha_class must be an integer 1, 2, 3, or 4 (NYHA 1994). 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 - [DASI](https://magentlab.com/docs/dasi) — Sum the Hlatky 1989 Duke Activity Status Index Table I weights for 12 yes/no activities and return DASI and estimated peak VO2. - [H2FPEF](https://magentlab.com/docs/h2fpef) — Sum the Reddy 2018 H2FPEF points score (six components, max 9) and return score and max_score only. ## 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.