# HAPS HAPS Status: LIVE Price: $0.005 USDC `GET /api/calc/haps` HTML: https://magentlab.com/docs/haps Markdown: https://magentlab.com/docs/haps.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Apply the Lankisch 2009 harmless acute pancreatitis score and return whether the three published criteria all hold (haps_harmless). ## When to use When an agent already has rebound tenderness and/or guarding, hematocrit, and serum creatinine assigned as normal or not, as in Lankisch 2009, and needs the published harmless result. magent does not measure hematocrit or creatinine. ## When not to use - Not a medical device. - Not a discharge order. Harmless on HAPS is not an instruction to discharge. - Not a diagnosis. magent does not diagnose pancreatitis or grade severity beyond the published Lankisch 2009 algorithm. - The caller assigns rebound tenderness and/or guarding as already determined. magent does not examine the abdomen. - magent does not measure hematocrit or serum creatinine. hematocrit_normal and creatinine_normal are caller-assigned flags. This tool does not apply millimetre or sex cutoffs. ## Formula ``` harmless iff no rebound tenderness and/or guarding and normal hematocrit and normal serum creatinine ``` ## Citation [The harmless acute pancreatitis score: a clinical algorithm for rapid initial stratification of nonsevere disease](https://doi.org/10.1016/j.cgh.2009.02.020) Lankisch PG, Weber-Dany B, Hebel K, Maisonneuve P, Lowenfels AB Clin Gastroenterol Hepatol. 2009;7(6):702-705 DOI: [10.1016/j.cgh.2009.02.020](https://doi.org/10.1016/j.cgh.2009.02.020) ## Worked example ### All three harmless conditions hold Given: `creatinine_normal=true, hematocrit_normal=true, rebound_or_guarding=false` 1. Rebound tenderness and/or guarding is absent 2. Hematocrit is normal and serum creatinine is normal as assigned by the caller 3. HAPS is harmless ## Also searched as - HAPS - harmless acute pancreatitis score - Lankisch HAPS - Lankisch 2009 - harmless pancreatitis score - HAPS pancreatitis - harmless AP score ## Parameters - `rebound_or_guarding` (boolean, required): Rebound tenderness and/or guarding. true means present and the harmless criterion fails. true or false as assigned by the caller. magent does not examine the abdomen. - `hematocrit_normal` (boolean, required): Hematocrit is normal as assigned by the caller. true means normal and the harmless criterion holds; false means not normal. magent does not measure hematocrit and does not apply a millimetre or sex cutoff. - `creatinine_normal` (boolean, required): Serum creatinine is normal as assigned by the caller. true means normal and the harmless criterion holds; false means not normal. magent does not measure creatinine and does not apply a millimetre or sex cutoff. ## 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/haps` 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": [ { "creatinine_normal": "true", "hematocrit_normal": "true", "rebound_or_guarding": "false" }, { "creatinine_normal": "true", "hematocrit_normal": "true", "rebound_or_guarding": "false" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/haps Example 200: ```json { "count": 2, "path": "/api/calc/haps", "items": [ { "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": "Lankisch PG, Weber-Dany B, Hebel K, Maisonneuve P, Lowenfels AB", "doi": "10.1016/j.cgh.2009.02.020", "id": "lankisch-2009", "pmid": "19245846", "source": "Clin Gastroenterol Hepatol. 2009;7(6):702-705", "title": "The harmless acute pancreatitis score: a clinical algorithm for rapid initial stratification of nonsevere disease" }, "formula": "haps", "formula_expression": "harmless iff no rebound tenderness and/or guarding and normal hematocrit and normal serum creatinine", "criteria": [ { "factor": "no_rebound_or_guarding", "met": true }, { "factor": "hematocrit_normal", "met": true }, { "factor": "creatinine_normal", "met": true } ], "haps_harmless": 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": "Lankisch PG, Weber-Dany B, Hebel K, Maisonneuve P, Lowenfels AB", "doi": "10.1016/j.cgh.2009.02.020", "id": "lankisch-2009", "pmid": "19245846", "source": "Clin Gastroenterol Hepatol. 2009;7(6):702-705", "title": "The harmless acute pancreatitis score: a clinical algorithm for rapid initial stratification of nonsevere disease" }, "formula": "haps", "formula_expression": "harmless iff no rebound tenderness and/or guarding and normal hematocrit and normal serum creatinine", "criteria": [ { "factor": "no_rebound_or_guarding", "met": true }, { "factor": "hematocrit_normal", "met": true }, { "factor": "creatinine_normal", "met": true } ], "haps_harmless": true } ] } ``` ## Response fields - `formula` (string): haps - `formula_expression` (string): Lankisch 2009: no rebound/guarding and normal hematocrit and normal creatinine - `haps_harmless` (boolean): true only when all three harmless conditions hold. Not a diagnosis and not a discharge order. - `criteria` (array): Per-factor rows with factor and met; met is true when that HAPS harmless condition holds - `citation` (object): Lankisch 2009 Clin Gastroenterol Hepatol citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "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": "Lankisch PG, Weber-Dany B, Hebel K, Maisonneuve P, Lowenfels AB", "doi": "10.1016/j.cgh.2009.02.020", "id": "lankisch-2009", "pmid": "19245846", "source": "Clin Gastroenterol Hepatol. 2009;7(6):702-705", "title": "The harmless acute pancreatitis score: a clinical algorithm for rapid initial stratification of nonsevere disease" }, "formula": "haps", "formula_expression": "harmless iff no rebound tenderness and/or guarding and normal hematocrit and normal serum creatinine", "criteria": [ { "factor": "no_rebound_or_guarding", "met": true }, { "factor": "hematocrit_normal", "met": true }, { "factor": "creatinine_normal", "met": true } ], "haps_harmless": true } ``` ## Errors - HTTP 400 `invalid_flag`: boolean clinical flags must be true or false 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 - [Ranson](https://magentlab.com/docs/ranson) — Sum the eleven Ranson 1974 prognostic signs (five at admission, six during the first 48 hours) and return the published mortality band. - [Glasgow-Imrie](https://magentlab.com/docs/glasgow-imrie) — Sum the eight Blamey 1984 Glasgow-Imrie factors and return whether severe pancreatitis is predicted (three or more factors). - [BISAP](https://magentlab.com/docs/bisap) — Compute the Wu 2008 BISAP score for early prediction of mortality in acute pancreatitis from BUN, caller-assigned impaired mental status, caller-assigned SIRS, age, and caller-assigned pleural effusion. ## 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. - 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.