magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Tradingofflineeip155:8453Exactvia cdp
Vocal-pennCirrhosisLiverSurgeryCalculator
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 snapshots so far.
$13.75
Verified settled volume
2,750 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-04 05:51Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x836Be278f1739fB4308091cD1852F7971Bc19Ee2The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "PAYMENT-SIGNATURE header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"paymentFlow": "upfront",
"resourceUrl": "https://api.magentlab.com/api/calc/vocal_penn",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
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"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "batch-settlement",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
],
"resource": {
"url": "https://api.magentlab.com/api/calc/vocal_penn",
"tags": [
"vocal-penn",
"cirrhosis",
"liver",
"surgery",
"calculator"
],
"mimeType": "application/json",
"description": "Mahmud 2021 VOCAL-Penn 30-day postoperative mortality logistic for cirrhosis. log_odds = -5.472096 + 1.061725*ASA + 0.927904*emergency + surgery dummies (laparoscopic abdominal reference) + Stata 3-knot RCS albumin (2.7, 3.7, 4.4) and platelets (75, 152, 271) + 0.1448936*bilirubin - 0.7541669*obesity + 0.8268748*NAFLD. Percent to 1 decimal. Not a surgical order. magent does not assign ASA or read labs.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 60,
"obesity": false,
"asa_class": 3,
"emergency": false,
"albumin_g_l": 35,
"albumin_g_dl": 3.5,
"bilirubin_mg_dl": 1.2,
"bilirubin_umol_l": 20.52,
"platelets_10e9_l": 150,
"surgery_category": "abdominal_wall",
"fatty_liver_disease": false
}
},
"output": {
"type": "json",
"example": {
"logit": -4.4496,
"formula": "mahmud_vocal_penn_30d_2021",
"obesity": false,
"citation": {
"id": "mahmud-2021-vocal-penn",
"doi": "10.1002/hep.31558",
"pmid": "32939786",
"title": "Risk Prediction Models for Post-Operative Mortality in Patients With Cirrhosis",
"source": "Hepatology. 2021;73(1):204-218",
"authors": "Mahmud N, Fricker Z, Hubbard RA, Ioannou GN, Lewis JD, Taddei TH, Rothstein KD, Serper M, Goldberg DS, Kaplan DE"
},
"age_years": 60,
"asa_class": 3,
"emergency": false,
"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.",
"albumin_g_dl": 3.5,
"bilirubin_mg_dl": 1.2,
"platelets_10e9_l": 150,
"surgery_category": "abdominal_wall",
"formula_expression": "log_odds = -5.472096 + 1.061725*ASA + 0.927904*emergency + 1.56071*abdominal_open + 0.7418021*abdominal_wall + 0.9165415*vascular + 1.464183*orthopedic + 1.893621*chest_cardiac - 0.0075185*platelets_sp1 + 0.0036657*platelets_sp2 - 0.5181509*albumin_sp1 - 1.000672*albumin_sp2 + 0.1448936*bilirubin_mg_dl - 0.7541669*obesity + 0.8268748*NAFLD; laparoscopic abdominal is the surgery reference; sp1 = x; sp2 = Stata mkspline 3-knot restricted cubic spline / (k3-k1)^2; albumin knots 2.7, 3.7, 4.4 g/dL; platelets knots 75, 152, 271 x10^9/L; mortality_30d_percent = 100*exp(log_odds)/(1+exp(log_odds)), 1 decimal",
"fatty_liver_disease": false,
"mortality_30d_percent": 1.2
}
},
"iconUrl": "https://api.magentlab.com/favicon.ico"
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"required": [
"age",
"platelets_10e9_l",
"obesity",
"fatty_liver_disease",
"asa_class",
"emergency",
"surgery_category"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). The Mahmud 2021 Supplement Appendix 30-day linear predictor does not retain age (age is in the 90- and 180-day models). Required because the published tool asks for it."
},
"obesity": {
"type": "boolean",
"description": "Caller-assigned BMI ≥30 kg/m² (true/false). Protective in the 30-day model. magent does not compute BMI."
},
"asa_class": {
"enum": [
2,
3,
4
],
"type": "integer",
"description": "Caller-assigned ASA physical status 2, 3, or 4 (ordinal in the Appendix). The derivation cohort had no ASA 1 and excluded ASA 5. magent does not assign ASA class."
},
"emergency": {
"type": "boolean",
"description": "Caller-assigned emergency indication (true/false). magent does not classify urgency."
},
"albumin_g_l": {
"type": "number",
"description": "Preoperative albumin in g/L (10-60). Converted as g/dL = g/L / 10."
},
"albumin_g_dl": {
"type": "number",
"description": "Preoperative albumin in g/dL (1.0-6.0). Provide this or albumin_g_l. Restricted cubic spline knots 2.7, 3.7, 4.4 (Supplemental Table 2). magent does not read the laboratory."
},
"bilirubin_mg_dl": {
"type": "number",
"description": "Preoperative total bilirubin in mg/dL (0.1-40). Provide this or bilirubin_umol_l. Linear in the 30-day Appendix model. magent does not read the laboratory."
},
"bilirubin_umol_l": {
"type": "number",
"description": "Preoperative total bilirubin in µmol/L (2-684). Converted as mg/dL = µmol/L / 17.1."
},
"platelets_10e9_l": {
"type": "number",
"description": "Preoperative platelet count in 10^9/L (10-800), equal to 1,000/µL. Spline knots 75, 152, 271 (Supplemental Table 2). magent does not read the laboratory."
},
"surgery_category": {
"enum": [
"abdominal_laparoscopic",
"abdominal",
"abdominal_wall",
"vascular",
"orthopedic",
"chest",
"cardiac"
],
"type": "string",
"description": "Mahmud 2021 Appendix surgery dummy as assigned by the caller. abdominal_laparoscopic is the reference (0). abdominal is open abdominal. chest and cardiac share the printed chest/cardiac coefficient. magent does not classify a CPT code."
},
"fatty_liver_disease": {
"type": "boolean",
"description": "Caller-assigned NAFLD as the etiology of cirrhosis (true/false). magent does not assign etiology."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.005USDC≈ $0.005 USD
on Base · exact scheme
Pay 0.005 USDC on Base to 0x836B…19Ee2. The signed payment is good for 10 minutes.
- Paid to
- 0x836B…19Ee2
- USD Coin contract
- 0x8335…02913
- Payment window
- 10 minutes
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"paymentFlow": "upfront",
"resourceUrl": "https://api.magentlab.com/api/calc/vocal_penn",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 60,
"obesity": false,
"asa_class": 3,
"emergency": false,
"albumin_g_l": 35,
"albumin_g_dl": 3.5,
"bilirubin_mg_dl": 1.2,
"bilirubin_umol_l": 20.52,
"platelets_10e9_l": 150,
"surgery_category": "abdominal_wall",
"fatty_liver_disease": false
},
{
"age": 60,
"obesity": false,
"asa_class": 3,
"emergency": false,
"albumin_g_l": 35,
"albumin_g_dl": 3.5,
"bilirubin_mg_dl": 1.2,
"bilirubin_umol_l": 20.52,
"platelets_10e9_l": 150,
"surgery_category": "abdominal_wall",
"fatty_liver_disease": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/vocal_penn",
"count": 2,
"items": [
{
"logit": -4.4496,
"formula": "mahmud_vocal_penn_30d_2021",
"obesity": false,
"citation": {
"id": "mahmud-2021-vocal-penn",
"doi": "10.1002/hep.31558",
"pmid": "32939786",
"title": "Risk Prediction Models for Post-Operative Mortality in Patients With Cirrhosis",
"source": "Hepatology. 2021;73(1):204-218",
"authors": "Mahmud N, Fricker Z, Hubbard RA, Ioannou GN, Lewis JD, Taddei TH, Rothstein KD, Serper M, Goldberg DS, Kaplan DE"
},
"age_years": 60,
"asa_class": 3,
"emergency": false,
"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.",
"albumin_g_dl": 3.5,
"bilirubin_mg_dl": 1.2,
"platelets_10e9_l": 150,
"surgery_category": "abdominal_wall",
"formula_expression": "log_odds = -5.472096 + 1.061725*ASA + 0.927904*emergency + 1.56071*abdominal_open + 0.7418021*abdominal_wall + 0.9165415*vascular + 1.464183*orthopedic + 1.893621*chest_cardiac - 0.0075185*platelets_sp1 + 0.0036657*platelets_sp2 - 0.5181509*albumin_sp1 - 1.000672*albumin_sp2 + 0.1448936*bilirubin_mg_dl - 0.7541669*obesity + 0.8268748*NAFLD; laparoscopic abdominal is the surgery reference; sp1 = x; sp2 = Stata mkspline 3-knot restricted cubic spline / (k3-k1)^2; albumin knots 2.7, 3.7, 4.4 g/dL; platelets knots 75, 152, 271 x10^9/L; mortality_30d_percent = 100*exp(log_odds)/(1+exp(log_odds)), 1 decimal",
"fatty_liver_disease": false,
"mortality_30d_percent": 1.2
},
{
"logit": -4.4496,
"formula": "mahmud_vocal_penn_30d_2021",
"obesity": false,
"citation": {
"id": "mahmud-2021-vocal-penn",
"doi": "10.1002/hep.31558",
"pmid": "32939786",
"title": "Risk Prediction Models for Post-Operative Mortality in Patients With Cirrhosis",
"source": "Hepatology. 2021;73(1):204-218",
"authors": "Mahmud N, Fricker Z, Hubbard RA, Ioannou GN, Lewis JD, Taddei TH, Rothstein KD, Serper M, Goldberg DS, Kaplan DE"
},
"age_years": 60,
"asa_class": 3,
"emergency": false,
"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.",
"albumin_g_dl": 3.5,
"bilirubin_mg_dl": 1.2,
"platelets_10e9_l": 150,
"surgery_category": "abdominal_wall",
"formula_expression": "log_odds = -5.472096 + 1.061725*ASA + 0.927904*emergency + 1.56071*abdominal_open + 0.7418021*abdominal_wall + 0.9165415*vascular + 1.464183*orthopedic + 1.893621*chest_cardiac - 0.0075185*platelets_sp1 + 0.0036657*platelets_sp2 - 0.5181509*albumin_sp1 - 1.000672*albumin_sp2 + 0.1448936*bilirubin_mg_dl - 0.7541669*obesity + 0.8268748*NAFLD; laparoscopic abdominal is the surgery reference; sp1 = x; sp2 = Stata mkspline 3-knot restricted cubic spline / (k3-k1)^2; albumin knots 2.7, 3.7, 4.4 g/dL; platelets knots 75, 152, 271 x10^9/L; mortality_30d_percent = 100*exp(log_odds)/(1+exp(log_odds)), 1 decimal",
"fatty_liver_disease": false,
"mortality_30d_percent": 1.2
}
]
}
},
"iconUrl": "https://api.magentlab.com/favicon.ico"
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"body": {
"type": "object",
"required": [
"items"
],
"properties": {
"items": {
"type": "array",
"items": {
"type": "object",
"required": [
"age",
"platelets_10e9_l",
"obesity",
"fatty_liver_disease",
"asa_class",
"emergency",
"surgery_category"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). The Mahmud 2021 Supplement Appendix 30-day linear predictor does not retain age (age is in the 90- and 180-day models). Required because the published tool asks for it."
},
"obesity": {
"type": "boolean",
"description": "Caller-assigned BMI ≥30 kg/m² (true/false). Protective in the 30-day model. magent does not compute BMI."
},
"asa_class": {
"enum": [
2,
3,
4
],
"type": "integer",
"description": "Caller-assigned ASA physical status 2, 3, or 4 (ordinal in the Appendix). The derivation cohort had no ASA 1 and excluded ASA 5. magent does not assign ASA class."
},
"emergency": {
"type": "boolean",
"description": "Caller-assigned emergency indication (true/false). magent does not classify urgency."
},
"albumin_g_l": {
"type": "number",
"description": "Preoperative albumin in g/L (10-60). Converted as g/dL = g/L / 10."
},
"albumin_g_dl": {
"type": "number",
"description": "Preoperative albumin in g/dL (1.0-6.0). Provide this or albumin_g_l. Restricted cubic spline knots 2.7, 3.7, 4.4 (Supplemental Table 2). magent does not read the laboratory."
},
"bilirubin_mg_dl": {
"type": "number",
"description": "Preoperative total bilirubin in mg/dL (0.1-40). Provide this or bilirubin_umol_l. Linear in the 30-day Appendix model. magent does not read the laboratory."
},
"bilirubin_umol_l": {
"type": "number",
"description": "Preoperative total bilirubin in µmol/L (2-684). Converted as mg/dL = µmol/L / 17.1."
},
"platelets_10e9_l": {
"type": "number",
"description": "Preoperative platelet count in 10^9/L (10-800), equal to 1,000/µL. Spline knots 75, 152, 271 (Supplemental Table 2). magent does not read the laboratory."
},
"surgery_category": {
"enum": [
"abdominal_laparoscopic",
"abdominal",
"abdominal_wall",
"vascular",
"orthopedic",
"chest",
"cardiac"
],
"type": "string",
"description": "Mahmud 2021 Appendix surgery dummy as assigned by the caller. abdominal_laparoscopic is the reference (0). abdominal is open abdominal. chest and cardiac share the printed chest/cardiac coefficient. magent does not classify a CPT code."
},
"fatty_liver_disease": {
"type": "boolean",
"description": "Caller-assigned NAFLD as the etiology of cirrhosis (true/false). magent does not assign etiology."
}
}
},
"maxItems": 25,
"minItems": 1
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"const": "POST"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-04 05:51Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-12 13:15Z
- x402 version
- 2
- Max timeout
- 600s
- Liveness probe
- HTTP 0
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service magent and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=magent' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.magentlab.com/api/calc/vocal_penn, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.