magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Tradingofflineeip155:8453Exactvia cdp
McmahonRhabdomyolysisKidneyAkiCalculator
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 15 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.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-31 13:00Z
—
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/mcmahon",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
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{
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"amount": "5000",
"scheme": "batch-settlement",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
],
"resource": {
"url": "https://api.magentlab.com/api/calc/mcmahon",
"tags": [
"mcmahon",
"rhabdomyolysis",
"kidney",
"aki",
"calculator"
],
"mimeType": "application/json",
"description": "McMahon 2013 Table 3 rhabdomyolysis score: age ≤50→0, >50–≤70→1.5, >70–≤80→2.5, >80→3; female 1; Cr <1.4→0, 1.4–2.2→1.5, >2.2→3; Ca <7.5→2; CPK >40000→2; origin not seizure/syncope/exercise/statin/myositis→3; PO4 <4.0→0, 4.0–5.4→1.5, >5.4→3; HCO3 <19→2. Max 19. Caller-supplied labs and origin. Numeric total only; not a dialysis order.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 40,
"sex": "male",
"cpk_u_l": 2000,
"calcium_mg_dl": 9,
"low_risk_origin": true,
"phosphate_mg_dl": 3.5,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.4,
"bicarbonate_mmol_l": 24
}
},
"output": {
"type": "json",
"example": {
"age": 40,
"sex": "male",
"score": 0,
"cpk_u_l": 2000,
"formula": "mcmahon",
"citation": {
"id": "mcmahon-2013",
"doi": "10.1001/jamainternmed.2013.9774",
"pmid": "23939467",
"title": "A risk prediction score for kidney failure or mortality in rhabdomyolysis",
"source": "JAMA Intern Med. 2013;173(19):1821-1828",
"authors": "McMahon GM, Zeng X, Waikar SS"
},
"max_score": 19,
"components": [
{
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"points": 0,
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},
{
"value": "male",
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{
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"factor": "creatinine",
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},
{
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"factor": "calcium",
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{
"value": 2000,
"factor": "cpk",
"points": 0,
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{
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"factor": "origin",
"points": 0,
"present": false
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{
"value": 3.5,
"factor": "phosphate",
"points": 0,
"present": false
},
{
"value": 24,
"factor": "bicarbonate",
"points": 0,
"present": 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.",
"calcium_mg_dl": 9,
"low_risk_origin": true,
"phosphate_mg_dl": 3.5,
"creatinine_mg_dl": 1,
"bicarbonate_mmol_l": 24,
"formula_expression": "McMahon = age(≤50→0, >50–≤70→1.5, >70–≤80→2.5, >80→3) + female(1) + Cr_mg_dL(<1.4→0, 1.4–2.2→1.5, >2.2→3) + Ca_mg_dL(<7.5→2) + CPK_U_L(>40000→2) + origin_not_seizure_syncope_exercise_statin_myositis(3) + PO4_mg_dL(<4.0→0, 4.0–5.4→1.5, >5.4→3) + HCO3_mEq_L(<19→2); McMahon 2013 Table 3 derivation; max 19"
}
},
"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",
"sex",
"calcium_mg_dl",
"cpk_u_l",
"low_risk_origin",
"phosphate_mg_dl",
"bicarbonate_mmol_l"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 18-120). McMahon 2013 Table 3: ≤50 → 0, >50 to ≤70 → 1.5, >70 to ≤80 → 2.5, >80 → 3. magent does not assign age."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex. Female scores 1 (McMahon 2013 Table 3). magent does not assign sex."
},
"cpk_u_l": {
"type": "number",
"description": "Initial CPK in U/L (1-500000). McMahon 2013 Table 3: >40000 → 2. 40000 is not >40000. magent does not assay CPK."
},
"calcium_mg_dl": {
"type": "number",
"description": "Initial calcium in mg/dL (4-16). McMahon 2013 Table 3: <7.5 → 2. 7.5 is not <7.5. magent does not assay calcium."
},
"low_risk_origin": {
"type": "boolean",
"description": "true when the cause is seizure, syncope, exercise, statin, or myositis (0 points). false otherwise (3 points; McMahon 2013 Table 3 origin not those causes). magent does not assign etiology."
},
"phosphate_mg_dl": {
"type": "number",
"description": "Initial phosphate in mg/dL (0.5-20). McMahon 2013 Table 3: <4.0 → 0, 4.0 to 5.4 inclusive → 1.5, >5.4 → 3. magent does not assay phosphate."
},
"creatinine_mg_dl": {
"type": "number",
"description": "Initial serum creatinine in mg/dL (0.1-20). Provide this or creatinine_umol_l. McMahon 2013 Table 3: <1.4 → 0, 1.4 to 2.2 inclusive → 1.5, >2.2 → 3. magent does not assay creatinine."
},
"creatinine_umol_l": {
"type": "number",
"description": "Initial serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42. magent does not assay creatinine."
},
"bicarbonate_mmol_l": {
"type": "number",
"description": "Initial bicarbonate in mEq/L or mmol/L (2-45). McMahon 2013 Table 3: <19 → 2. 19 is not <19. magent does not assay bicarbonate."
}
}
}
},
"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
[
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"extra": {
"name": "USD Coin",
"version": "2",
"paymentFlow": "upfront",
"resourceUrl": "https://api.magentlab.com/api/calc/mcmahon",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 40,
"sex": "male",
"cpk_u_l": 2000,
"calcium_mg_dl": 9,
"low_risk_origin": true,
"phosphate_mg_dl": 3.5,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.4,
"bicarbonate_mmol_l": 24
},
{
"age": 40,
"sex": "male",
"cpk_u_l": 2000,
"calcium_mg_dl": 9,
"low_risk_origin": true,
"phosphate_mg_dl": 3.5,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.4,
"bicarbonate_mmol_l": 24
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/mcmahon",
"count": 2,
"items": [
{
"age": 40,
"sex": "male",
"score": 0,
"cpk_u_l": 2000,
"formula": "mcmahon",
"citation": {
"id": "mcmahon-2013",
"doi": "10.1001/jamainternmed.2013.9774",
"pmid": "23939467",
"title": "A risk prediction score for kidney failure or mortality in rhabdomyolysis",
"source": "JAMA Intern Med. 2013;173(19):1821-1828",
"authors": "McMahon GM, Zeng X, Waikar SS"
},
"max_score": 19,
"components": [
{
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"factor": "age",
"points": 0,
"present": false
},
{
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"factor": "female",
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{
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{
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"factor": "cpk",
"points": 0,
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{
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"points": 0,
"present": false
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"factor": "phosphate",
"points": 0,
"present": false
},
{
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"factor": "bicarbonate",
"points": 0,
"present": 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.",
"calcium_mg_dl": 9,
"low_risk_origin": true,
"phosphate_mg_dl": 3.5,
"creatinine_mg_dl": 1,
"bicarbonate_mmol_l": 24,
"formula_expression": "McMahon = age(≤50→0, >50–≤70→1.5, >70–≤80→2.5, >80→3) + female(1) + Cr_mg_dL(<1.4→0, 1.4–2.2→1.5, >2.2→3) + Ca_mg_dL(<7.5→2) + CPK_U_L(>40000→2) + origin_not_seizure_syncope_exercise_statin_myositis(3) + PO4_mg_dL(<4.0→0, 4.0–5.4→1.5, >5.4→3) + HCO3_mEq_L(<19→2); McMahon 2013 Table 3 derivation; max 19"
},
{
"age": 40,
"sex": "male",
"score": 0,
"cpk_u_l": 2000,
"formula": "mcmahon",
"citation": {
"id": "mcmahon-2013",
"doi": "10.1001/jamainternmed.2013.9774",
"pmid": "23939467",
"title": "A risk prediction score for kidney failure or mortality in rhabdomyolysis",
"source": "JAMA Intern Med. 2013;173(19):1821-1828",
"authors": "McMahon GM, Zeng X, Waikar SS"
},
"max_score": 19,
"components": [
{
"value": 40,
"factor": "age",
"points": 0,
"present": false
},
{
"value": "male",
"factor": "female",
"points": 0,
"present": false
},
{
"value": 1,
"factor": "creatinine",
"points": 0,
"present": false
},
{
"value": 9,
"factor": "calcium",
"points": 0,
"present": false
},
{
"value": 2000,
"factor": "cpk",
"points": 0,
"present": false
},
{
"value": true,
"factor": "origin",
"points": 0,
"present": false
},
{
"value": 3.5,
"factor": "phosphate",
"points": 0,
"present": false
},
{
"value": 24,
"factor": "bicarbonate",
"points": 0,
"present": 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.",
"calcium_mg_dl": 9,
"low_risk_origin": true,
"phosphate_mg_dl": 3.5,
"creatinine_mg_dl": 1,
"bicarbonate_mmol_l": 24,
"formula_expression": "McMahon = age(≤50→0, >50–≤70→1.5, >70–≤80→2.5, >80→3) + female(1) + Cr_mg_dL(<1.4→0, 1.4–2.2→1.5, >2.2→3) + Ca_mg_dL(<7.5→2) + CPK_U_L(>40000→2) + origin_not_seizure_syncope_exercise_statin_myositis(3) + PO4_mg_dL(<4.0→0, 4.0–5.4→1.5, >5.4→3) + HCO3_mEq_L(<19→2); McMahon 2013 Table 3 derivation; max 19"
}
]
}
},
"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",
"sex",
"calcium_mg_dl",
"cpk_u_l",
"low_risk_origin",
"phosphate_mg_dl",
"bicarbonate_mmol_l"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 18-120). McMahon 2013 Table 3: ≤50 → 0, >50 to ≤70 → 1.5, >70 to ≤80 → 2.5, >80 → 3. magent does not assign age."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex. Female scores 1 (McMahon 2013 Table 3). magent does not assign sex."
},
"cpk_u_l": {
"type": "number",
"description": "Initial CPK in U/L (1-500000). McMahon 2013 Table 3: >40000 → 2. 40000 is not >40000. magent does not assay CPK."
},
"calcium_mg_dl": {
"type": "number",
"description": "Initial calcium in mg/dL (4-16). McMahon 2013 Table 3: <7.5 → 2. 7.5 is not <7.5. magent does not assay calcium."
},
"low_risk_origin": {
"type": "boolean",
"description": "true when the cause is seizure, syncope, exercise, statin, or myositis (0 points). false otherwise (3 points; McMahon 2013 Table 3 origin not those causes). magent does not assign etiology."
},
"phosphate_mg_dl": {
"type": "number",
"description": "Initial phosphate in mg/dL (0.5-20). McMahon 2013 Table 3: <4.0 → 0, 4.0 to 5.4 inclusive → 1.5, >5.4 → 3. magent does not assay phosphate."
},
"creatinine_mg_dl": {
"type": "number",
"description": "Initial serum creatinine in mg/dL (0.1-20). Provide this or creatinine_umol_l. McMahon 2013 Table 3: <1.4 → 0, 1.4 to 2.2 inclusive → 1.5, >2.2 → 3. magent does not assay creatinine."
},
"creatinine_umol_l": {
"type": "number",
"description": "Initial serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42. magent does not assay creatinine."
},
"bicarbonate_mmol_l": {
"type": "number",
"description": "Initial bicarbonate in mEq/L or mmol/L (2-45). McMahon 2013 Table 3: <19 → 2. 19 is not <19. magent does not assay bicarbonate."
}
}
},
"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
- 2026-08-31 13:00Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-11 02:15Z
- 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. 15 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/mcmahon, 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.