# Magent

> 844 cited clinical calculators and medical code lookup for agents. $0.005 USDC per call on Base via x402. HTTP API, not a medical device.

Pay-per-request HTTP API. GET a paid path, receive HTTP 402 with PAYMENT-REQUIRED, sign PAYMENT-SIGNATURE (x402 V2 exact, USDC on Base), and retry the same URL. Invalid params after a signature are HTTP 400 without charge. HTTP 503 means retry the same PAYMENT-SIGNATURE. EIP-3009 validBefore is 600 seconds. No API keys. Do not send patient names or MRNs. Full path index and handshake: https://api.magentlab.com/llms-full.txt.

## Docs

- [Docs](https://magentlab.com/docs)
- [Payments](https://magentlab.com/docs/payments)
- [Verification](https://magentlab.com/docs/verification) — How Magent cross-checks 87 calculators against independent reference calculators and the cited papers, with every difference documented.

## Calculator explainers

150 plain-language articles on published formulas Magent implements.

- [All explainers](https://magentlab.com/calculators)
- [Body size](https://magentlab.com/docs/families/body-size) (2)
- [Fluids](https://magentlab.com/docs/families/fluids) (1)
- [Hemodynamics](https://magentlab.com/docs/families/hemodynamics) (7)
- [Respiratory](https://magentlab.com/docs/families/respiratory) (8)
- [Kidney](https://magentlab.com/docs/families/kidney) (9)
- [Atrial fibrillation](https://magentlab.com/docs/families/atrial-fibrillation) (3)
- [ACS](https://magentlab.com/docs/families/acs) (7)
- [Liver](https://magentlab.com/docs/families/liver) (8)
- [GI](https://magentlab.com/docs/families/gi) (7)
- [Electrolytes / glucose](https://magentlab.com/docs/families/electrolytes) (7)
- [Infection / VTE](https://magentlab.com/docs/families/infection-vte) (24)
- [Emergency](https://magentlab.com/docs/families/emergency) (33)
- [Neurology](https://magentlab.com/docs/families/neurology) (17)
- [Hematology](https://magentlab.com/docs/families/hematology) (16)
- [Neonatal](https://magentlab.com/docs/families/neonatal) (1)

Markdown twins:

- [ABC/2 hemorrhage volume (.md)](https://magentlab.com/docs/abc2.md)
- [ABCD2 score (.md)](https://magentlab.com/docs/abcd2.md)
- [ACE score (Felitti 1998) (.md)](https://magentlab.com/docs/ace.md)
- [ALC (Shapiro 1998) (.md)](https://magentlab.com/docs/alc.md)
- [Allowable blood loss (Gross 1983) (.md)](https://magentlab.com/docs/allowable-blood-loss.md)
- [Alvarado score (.md)](https://magentlab.com/docs/alvarado.md)
- [Absolute neutrophil count (.md)](https://magentlab.com/docs/anc.md)
- [Apgar score (.md)](https://magentlab.com/docs/apgar.md)
- [AST to platelet ratio index (.md)](https://magentlab.com/docs/apri.md)
- [ASPECTS (Barber 2000) (.md)](https://magentlab.com/docs/aspects.md)
- [AUDIT-C (Bush 1998) (.md)](https://magentlab.com/docs/audit-c.md)
- [Berlin definition of ARDS (2012) (.md)](https://magentlab.com/docs/berlin-ards.md)
- [BISAP score (.md)](https://magentlab.com/docs/bisap.md)
- [Behavioral Pain Scale (BPS) (.md)](https://magentlab.com/docs/bps.md)
- [Braden Scale (.md)](https://magentlab.com/docs/braden.md)
- [BRI (Thomas 2013) (.md)](https://magentlab.com/docs/bri.md)
- [BSA formula (Mosteller) (.md)](https://magentlab.com/docs/bsa.md)
- [BUN/creatinine ratio (Richards 1990) (.md)](https://magentlab.com/docs/bun-creatinine-ratio.md)
- [CAGE questionnaire (Ewing 1984) (.md)](https://magentlab.com/docs/cage.md)
- [Canadian C-spine rule (.md)](https://magentlab.com/docs/canadian-c-spine.md)
- [Canadian CT Head Rule (.md)](https://magentlab.com/docs/canadian-ct-head.md)
- [Caprini score (Caprini 2005) (.md)](https://magentlab.com/docs/caprini.md)
- [Corrected count increment (CCI) (.md)](https://magentlab.com/docs/cci.md)
- [CDAI, Crohn's disease (Best 1976) (.md)](https://magentlab.com/docs/cdai.md)
- [Centor score (.md)](https://magentlab.com/docs/centor.md)
- [CHADS2 score (.md)](https://magentlab.com/docs/chads2.md)
- [Child-Pugh score (.md)](https://magentlab.com/docs/child-pugh.md)
- [CIWA-Ar (Sullivan 1989) (.md)](https://magentlab.com/docs/ciwa-ar.md)
- [CLL-IPI (.md)](https://magentlab.com/docs/cll-ipi.md)
- [Corrected calcium (simplified Payne) (.md)](https://magentlab.com/docs/corrected-calcium.md)
- [Corrected sodium (.md)](https://magentlab.com/docs/corrected-sodium.md)
- [CPIS (Pugin 1991) (.md)](https://magentlab.com/docs/cpis.md)
- [C-peptide index (CPR index) (.md)](https://magentlab.com/docs/cpri.md)
- [CRB-65 (.md)](https://magentlab.com/docs/crb-65.md)
- [CURB-65 (.md)](https://magentlab.com/docs/curb65.md)
- [Duke Activity Status Index (DASI) (.md)](https://magentlab.com/docs/dasi.md)
- [Duke treadmill score (Mark 1991) (.md)](https://magentlab.com/docs/duke-treadmill.md)
- [Duval AML score (.md)](https://magentlab.com/docs/duval-aml.md)
- [ECOG performance status (Oken 1982) (.md)](https://magentlab.com/docs/ecog.md)
- [EUROMACS-RHF score (.md)](https://magentlab.com/docs/euromacs-rhf.md)
- [FENa (fractional excretion of sodium) (.md)](https://magentlab.com/docs/fena.md)
- [Fractional excretion of urea (.md)](https://magentlab.com/docs/feurea.md)
- [FIB-4 index (.md)](https://magentlab.com/docs/fib4.md)
- [Forrest classification (Forrest 1974) (.md)](https://magentlab.com/docs/forrest.md)
- [FOUR score (Wijdicks 2005) (.md)](https://magentlab.com/docs/four-score.md)
- [4Ts score (.md)](https://magentlab.com/docs/four-ts.md)
- [GIPSS (Tefferi 2018) (.md)](https://magentlab.com/docs/gipss.md)
- [Glasgow-Blatchford score (.md)](https://magentlab.com/docs/glasgow-blatchford.md)
- [Gleason score (1974) (.md)](https://magentlab.com/docs/gleason.md)
- [GRACE score (Granger 2003 in-hospital) (.md)](https://magentlab.com/docs/grace.md)
- [HAS-BLED (.md)](https://magentlab.com/docs/has-bled.md)
- [HEART score (.md)](https://magentlab.com/docs/heart.md)
- [HFA-ICOS anthracycline baseline risk (.md)](https://magentlab.com/docs/hfa-icos-anthracycline.md)
- [HFA-ICOS BCR-ABL baseline risk (.md)](https://magentlab.com/docs/hfa-icos-bcr-abl.md)
- [HINTS exam (.md)](https://magentlab.com/docs/hints.md)
- [HScore (Fardet 2014) (.md)](https://magentlab.com/docs/hscore.md)
- [Hunt and Hess scale (.md)](https://magentlab.com/docs/hunt-hess.md)
- [ICE score (Lee 2019) (.md)](https://magentlab.com/docs/ice.md)
- [ICH score (.md)](https://magentlab.com/docs/ich-score.md)
- [IMPACT TBI score (.md)](https://magentlab.com/docs/impact.md)
- [IMPEDE VTE score (.md)](https://magentlab.com/docs/impede-vte.md)
- [Infant scalp score (.md)](https://magentlab.com/docs/infant-scalp.md)
- [Injury Severity Score (ISS) (.md)](https://magentlab.com/docs/iss.md)
- [Jones criteria, acute rheumatic fever (AHA 2015) (.md)](https://magentlab.com/docs/jones.md)
- [Katz index of ADL (Katz 1963) (.md)](https://magentlab.com/docs/katz.md)
- [Kidney Failure Risk Equation (KFRE) (.md)](https://magentlab.com/docs/kfre.md)
- [Khorana score (.md)](https://magentlab.com/docs/khorana.md)
- [Kocher criteria (Kocher 1999) (.md)](https://magentlab.com/docs/kocher.md)
- [LAMS score (Llanes 2004) (.md)](https://magentlab.com/docs/lams.md)
- [Light's criteria (.md)](https://magentlab.com/docs/lights.md)
- [LRINEC score (Wong 2004) (.md)](https://magentlab.com/docs/lrinec.md)
- [Maddrey discriminant function (.md)](https://magentlab.com/docs/maddrey.md)
- [MAGGIC heart failure score (.md)](https://magentlab.com/docs/maggic.md)
- [Modified Mallampati class (.md)](https://magentlab.com/docs/mallampati.md)
- [Mean arterial pressure (MAP) (.md)](https://magentlab.com/docs/map.md)
- [McMahon score (rhabdomyolysis) (.md)](https://magentlab.com/docs/mcmahon.md)
- [MELD (Kamath 2001 original) (.md)](https://magentlab.com/docs/meld.md)
- [Modified Early Warning Score (Subbe 2001) (.md)](https://magentlab.com/docs/mews.md)
- [MIPI (simplified) (.md)](https://magentlab.com/docs/mipi.md)
- [mMRC dyspnea scale (Mahler 1988) (.md)](https://magentlab.com/docs/mmrc.md)
- [Modified Rankin scale (van Swieten 1988) (.md)](https://magentlab.com/docs/modified-rankin.md)
- [Modified Sgarbossa (Smith 2012) (.md)](https://magentlab.com/docs/modified-sgarbossa.md)
- [NAS (Kleiner 2005) (.md)](https://magentlab.com/docs/nafld-nas.md)
- [NEDOCS (Weiss 2004) (.md)](https://magentlab.com/docs/nedocs.md)
- [New Orleans Head CT Rule (.md)](https://magentlab.com/docs/new-orleans-head.md)
- [NEXUS criteria (.md)](https://magentlab.com/docs/nexus.md)
- [NIH Stroke Scale (NIHSS) (.md)](https://magentlab.com/docs/nihss.md)
- [Neutrophil lymphocyte ratio (Zahorec 2001) (.md)](https://magentlab.com/docs/nlr.md)
- [Nutritional Risk Index (NRI) (.md)](https://magentlab.com/docs/nri.md)
- [NRS-2002 (Nutritional Risk Screening) (.md)](https://magentlab.com/docs/nrs-2002.md)
- [NUTRIC score (.md)](https://magentlab.com/docs/nutric.md)
- [ORBIT bleeding score (.md)](https://magentlab.com/docs/orbit.md)
- [Ottawa ankle rules (.md)](https://magentlab.com/docs/ottawa-ankle.md)
- [Ottawa knee rules (.md)](https://magentlab.com/docs/ottawa-knee.md)
- [Ottawa SAH Rule (.md)](https://magentlab.com/docs/ottawa-sah.md)
- [Padua score (.md)](https://magentlab.com/docs/padua.md)
- [PAINAD scale (Warden 2003) (.md)](https://magentlab.com/docs/painad.md)
- [PAS (Samuel 2002) (.md)](https://magentlab.com/docs/pas.md)
- [PASI (Fredriksson 1978) (.md)](https://magentlab.com/docs/pasi.md)
- [PAWSS (Maldonado 2014) (.md)](https://magentlab.com/docs/pawss.md)
- [PCDAI (Pediatric Crohn's Disease Activity Index) (.md)](https://magentlab.com/docs/pcdai.md)
- [PECARN head injury rule (.md)](https://magentlab.com/docs/pecarn-head.md)
- [Pediatric ETT size (Cole) (.md)](https://magentlab.com/docs/pediatric-ett.md)
- [PEDIS classification (.md)](https://magentlab.com/docs/pedis.md)
- [PERC rule (.md)](https://magentlab.com/docs/perc.md)
- [PESI (.md)](https://magentlab.com/docs/pesi.md)
- [PHQ-9 score (Kroenke 2001) (.md)](https://magentlab.com/docs/phq-9.md)
- [PLASMIC score (Bendapudi 2017) (.md)](https://magentlab.com/docs/plasmic.md)
- [PSA density (Benson 1992) (.md)](https://magentlab.com/docs/psad.md)
- [PSA doubling time (Pound 1999) (.md)](https://magentlab.com/docs/psadt.md)
- [PSI/PORT (Fine 1997) (.md)](https://magentlab.com/docs/psi-port.md)
- [qSOFA score (.md)](https://magentlab.com/docs/qsofa.md)
- [R factor (Bénichou 1990 / CIOMS) (.md)](https://magentlab.com/docs/r-factor.md)
- [RACE scale (stroke) (.md)](https://magentlab.com/docs/race.md)
- [Richmond Agitation-Sedation Scale (RASS) (.md)](https://magentlab.com/docs/rass.md)
- [Revised Cardiac Risk Index (RCRI) (.md)](https://magentlab.com/docs/rcri.md)
- [Reticulocyte index (.md)](https://magentlab.com/docs/reticulocyte-index.md)
- [REVEAL 2.0 PAH risk score (.md)](https://magentlab.com/docs/reveal-pah.md)
- [Revised Geneva score (.md)](https://magentlab.com/docs/revised-geneva.md)
- [Rockall score (pre-endoscopy) (.md)](https://magentlab.com/docs/rockall-pre.md)
- [RoPE (Kent 2013) (.md)](https://magentlab.com/docs/rope.md)
- [ROX index (.md)](https://magentlab.com/docs/rox.md)
- [Rapid shallow breathing index (.md)](https://magentlab.com/docs/rsbi.md)
- [Rule of nines (adult, Wallace 1951) (.md)](https://magentlab.com/docs/rule-of-nines.md)
- [Serum-ascites albumin gradient (SAAG) (.md)](https://magentlab.com/docs/saag.md)
- [Bedside Schwartz eGFR (.md)](https://magentlab.com/docs/schwartz-gfr.md)
- [SCOFF (Morgan 1999) (.md)](https://magentlab.com/docs/scoff.md)
- [Serum osmolality formula (.md)](https://magentlab.com/docs/serum-osmolality.md)
- [S/F ratio (.md)](https://magentlab.com/docs/sf-ratio.md)
- [San Francisco Syncope Rule (.md)](https://magentlab.com/docs/sf-syncope.md)
- [Sgarbossa criteria (.md)](https://magentlab.com/docs/sgarbossa.md)
- [Shock index (.md)](https://magentlab.com/docs/shock-index.md)
- [Sepsis-induced coagulopathy (SIC) score (.md)](https://magentlab.com/docs/sic.md)
- [SIRS criteria (.md)](https://magentlab.com/docs/sirs.md)
- [SLICS (Vaccaro 2007) (.md)](https://magentlab.com/docs/slics.md)
- [sPESI (.md)](https://magentlab.com/docs/spesi.md)
- [Stool osmotic gap (.md)](https://magentlab.com/docs/stool-osmotic-gap.md)
- [STOP-Bang score (.md)](https://magentlab.com/docs/stop-bang.md)
- [Surgical Apgar Score (.md)](https://magentlab.com/docs/surgical-apgar.md)
- [TIMI risk score for STEMI (.md)](https://magentlab.com/docs/timi-stemi.md)
- [TIMI risk score (UA/NSTEMI) (.md)](https://magentlab.com/docs/timi-ua-nstemi.md)
- [Urine anion gap (.md)](https://magentlab.com/docs/urine-anion-gap.md)
- [Urine protein/creatinine ratio (Ginsberg 1983) (.md)](https://magentlab.com/docs/urine-pcr.md)
- [VACS Index 1.0 (.md)](https://magentlab.com/docs/vacs-1.md)
- [Wells DVT score (.md)](https://magentlab.com/docs/wells-dvt.md)
- [Wells PE score (.md)](https://magentlab.com/docs/wells-pe.md)
- [Westley croup score (Westley 1978) (.md)](https://magentlab.com/docs/westley-croup.md)
- [Winters' formula (.md)](https://magentlab.com/docs/winters.md)
- [Surgical wound class (Mangram 1999) (.md)](https://magentlab.com/docs/wound-class.md)
- [YEARS algorithm (.md)](https://magentlab.com/docs/years.md)


## Discovery

- [x402](https://api.magentlab.com/.well-known/x402)
- [APIs.json](https://magentlab.com/.well-known/apis.json)
- [OpenAPI](https://api.magentlab.com/openapi.json)
- [Catalog](https://api.magentlab.com/v1/catalog)
- [Full index](https://api.magentlab.com/llms-full.txt)

## MCP

Install `@magentlab/mcp` with `npx -y @magentlab/mcp`. The client pages tools and pays with the caller's x402 key. HTTP 400 does not charge. HTTP 503 retries the same PAYMENT-SIGNATURE.

- [MCP](https://magentlab.com/docs/mcp)
- [MCP markdown](https://magentlab.com/docs/mcp.md)

## Example paid route

- [eGFR CKD-EPI](https://api.magentlab.com/api/calc/egfr) (returns 402)