magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Inferenceofflineeip155:8453Exactvia cdp
EhmrgHeart-failureEmergencyMortalityCalculator
Calls · 30d
3→ 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.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-31 13:24Z
—
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/ehmrg",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"withdrawDelay": 86400,
"receiverAuthorizer": "0x3721824a31197dcDD2984cF43b92B6cc8A87c0Fb",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "batch-settlement",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
],
"resource": {
"url": "https://api.magentlab.com/api/calc/ehmrg",
"tags": [
"ehmrg",
"heart-failure",
"emergency",
"mortality",
"calculator"
],
"mimeType": "application/json",
"description": "Lee 2012 EHMRG 7-day ED model (Table 3 integer score): 2*age + 60 if EMS transport - min(SBP,160) + clamp(HR,80-120) - 2*min(SpO2,92) + 20*creatinine_mg_dl + K (<=3.9: +5; 4.0-4.5: 0; >=4.6: +30) + 60 if troponin>ULN + 45 if active cancer + 60 if home metolazone + 12. Groups 1/2/3/4/5a/5b. Dialysis-dependent excluded. Not EHMRG30-ST, not ADHERE CART, not a discharge or admission order.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 70,
"metolazone": false,
"spo2_percent": 92,
"active_cancer": false,
"ems_transport": false,
"heart_rate_bpm": 80,
"systolic_mm_hg": 160,
"troponin_gt_uln": false,
"creatinine_mg_dl": 1,
"potassium_mmol_l": 4.2,
"creatinine_umol_l": 88.4,
"dialysis_dependent": false
}
},
"output": {
"type": "json",
"example": {
"formula": "ehmrg",
"citation": {
"id": "lee-2012",
"doi": "10.7326/0003-4819-156-11-201206050-00003",
"pmid": "22665814",
"title": "Prediction of heart failure mortality in emergent care: a cohort study",
"source": "Ann Intern Med. 2012;156(11):767-775",
"authors": "Lee DS, Stitt A, Austin PC, Stukel TA, Schull MJ, Chong A, Newton GE, Lee JS, Tu JV"
},
"age_years": 70,
"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.",
"metolazone": false,
"risk_group": "1",
"ehmrg_score": -92,
"spo2_percent": 92,
"active_cancer": false,
"ems_transport": false,
"heart_rate_bpm": 80,
"systolic_mm_hg": 160,
"troponin_gt_uln": false,
"creatinine_mg_dl": 1,
"potassium_mmol_l": 4.2,
"dialysis_dependent": false,
"formula_expression": "ehmrg_score = 2*age_years + 60*(ems_transport) - min(systolic_mm_hg, 160) + clamp(heart_rate_bpm, 80, 120) - 2*min(spo2_percent, 92) + 20*creatinine_mg_dl + K(<=3.9:5, 4.0-4.5:0, >=4.6:30) + 60*(troponin_gt_uln) + 45*(active_cancer) + 60*(metolazone) + 12; Lee 2012 Table 3 7-day ED model; dialysis-dependent excluded; risk_group 1 (score <= -49.1), 2 (-49.0 to -15.9), 3 (-15.8 to 17.9), 4 (18.0 to 56.5), 5a (56.6 to 89.3), 5b (>= 89.4)"
}
},
"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",
"ems_transport",
"systolic_mm_hg",
"heart_rate_bpm",
"spo2_percent",
"potassium_mmol_l",
"troponin_gt_uln",
"active_cancer",
"metolazone",
"dialysis_dependent"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 18-120). Lee 2012 Table 3 adds +2 per year. magent does not assign age."
},
"metolazone": {
"type": "boolean",
"description": "Metolazone at home as assigned by the caller (true or false). Lee 2012 Table 3: +60 if true."
},
"spo2_percent": {
"type": "number",
"description": "Lowest initial/triage oxygen saturation percent (50-100). Lee 2012 Table 3 scores -2 * min(SpO2, 92); values above 92% are capped. magent does not measure saturation."
},
"active_cancer": {
"type": "boolean",
"description": "Active cancer as assigned by the caller (true or false). Lee 2012 Table 3: +45 if true."
},
"ems_transport": {
"type": "boolean",
"description": "Transported by EMS as assigned by the caller (true or false). Lee 2012 Table 3: +60 if true."
},
"heart_rate_bpm": {
"type": "integer",
"description": "Heart rate in beats/min (integer 30-220). Lee 2012 Table 3 scores +1 * clamp(HR, 80, 120): floor 80, ceiling 120. magent does not measure heart rate."
},
"systolic_mm_hg": {
"type": "integer",
"description": "Initial/triage systolic blood pressure in mm Hg (integer 50-250). Lee 2012 Table 3 scores -1 * min(SBP, 160); values above 160 mm Hg are capped. magent does not measure blood pressure."
},
"troponin_gt_uln": {
"type": "boolean",
"description": "Troponin above the local upper limit of normal as assigned by the caller (true or false). Lee 2012 Table 3: +60 if true."
},
"creatinine_mg_dl": {
"type": "number",
"description": "Serum creatinine in mg/dL (0.1-20). Provide this or creatinine_umol_l, not both. Lee 2012 Table 3 adds +20 per mg/dL. magent does not measure creatinine."
},
"potassium_mmol_l": {
"type": "number",
"description": "Serum potassium in mmol/L (1.5-8.0). Lee 2012 Table 3: 4.0-4.5 inclusive → 0; >=4.6 → +30; <=3.9 → +5. Unpublished 3.91-3.99 pin with <=3.9; 4.51-4.59 pin with >=4.6. magent does not measure potassium."
},
"creatinine_umol_l": {
"type": "number",
"description": "Serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42. Provide this or creatinine_mg_dl, not both."
},
"dialysis_dependent": {
"type": "boolean",
"description": "Dialysis dependence as assigned by the caller (true or false). Lee 2012 excludes dialysis-dependent patients; true returns HTTP 400. magent does not determine dialysis status."
}
}
}
},
"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/ehmrg",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 70,
"metolazone": false,
"spo2_percent": 92,
"active_cancer": false,
"ems_transport": false,
"heart_rate_bpm": 80,
"systolic_mm_hg": 160,
"troponin_gt_uln": false,
"creatinine_mg_dl": 1,
"potassium_mmol_l": 4.2,
"creatinine_umol_l": 88.4,
"dialysis_dependent": false
},
{
"age": 70,
"metolazone": false,
"spo2_percent": 92,
"active_cancer": false,
"ems_transport": false,
"heart_rate_bpm": 80,
"systolic_mm_hg": 160,
"troponin_gt_uln": false,
"creatinine_mg_dl": 1,
"potassium_mmol_l": 4.2,
"creatinine_umol_l": 88.4,
"dialysis_dependent": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/ehmrg",
"count": 2,
"items": [
{
"formula": "ehmrg",
"citation": {
"id": "lee-2012",
"doi": "10.7326/0003-4819-156-11-201206050-00003",
"pmid": "22665814",
"title": "Prediction of heart failure mortality in emergent care: a cohort study",
"source": "Ann Intern Med. 2012;156(11):767-775",
"authors": "Lee DS, Stitt A, Austin PC, Stukel TA, Schull MJ, Chong A, Newton GE, Lee JS, Tu JV"
},
"age_years": 70,
"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.",
"metolazone": false,
"risk_group": "1",
"ehmrg_score": -92,
"spo2_percent": 92,
"active_cancer": false,
"ems_transport": false,
"heart_rate_bpm": 80,
"systolic_mm_hg": 160,
"troponin_gt_uln": false,
"creatinine_mg_dl": 1,
"potassium_mmol_l": 4.2,
"dialysis_dependent": false,
"formula_expression": "ehmrg_score = 2*age_years + 60*(ems_transport) - min(systolic_mm_hg, 160) + clamp(heart_rate_bpm, 80, 120) - 2*min(spo2_percent, 92) + 20*creatinine_mg_dl + K(<=3.9:5, 4.0-4.5:0, >=4.6:30) + 60*(troponin_gt_uln) + 45*(active_cancer) + 60*(metolazone) + 12; Lee 2012 Table 3 7-day ED model; dialysis-dependent excluded; risk_group 1 (score <= -49.1), 2 (-49.0 to -15.9), 3 (-15.8 to 17.9), 4 (18.0 to 56.5), 5a (56.6 to 89.3), 5b (>= 89.4)"
},
{
"formula": "ehmrg",
"citation": {
"id": "lee-2012",
"doi": "10.7326/0003-4819-156-11-201206050-00003",
"pmid": "22665814",
"title": "Prediction of heart failure mortality in emergent care: a cohort study",
"source": "Ann Intern Med. 2012;156(11):767-775",
"authors": "Lee DS, Stitt A, Austin PC, Stukel TA, Schull MJ, Chong A, Newton GE, Lee JS, Tu JV"
},
"age_years": 70,
"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.",
"metolazone": false,
"risk_group": "1",
"ehmrg_score": -92,
"spo2_percent": 92,
"active_cancer": false,
"ems_transport": false,
"heart_rate_bpm": 80,
"systolic_mm_hg": 160,
"troponin_gt_uln": false,
"creatinine_mg_dl": 1,
"potassium_mmol_l": 4.2,
"dialysis_dependent": false,
"formula_expression": "ehmrg_score = 2*age_years + 60*(ems_transport) - min(systolic_mm_hg, 160) + clamp(heart_rate_bpm, 80, 120) - 2*min(spo2_percent, 92) + 20*creatinine_mg_dl + K(<=3.9:5, 4.0-4.5:0, >=4.6:30) + 60*(troponin_gt_uln) + 45*(active_cancer) + 60*(metolazone) + 12; Lee 2012 Table 3 7-day ED model; dialysis-dependent excluded; risk_group 1 (score <= -49.1), 2 (-49.0 to -15.9), 3 (-15.8 to 17.9), 4 (18.0 to 56.5), 5a (56.6 to 89.3), 5b (>= 89.4)"
}
]
}
},
"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",
"ems_transport",
"systolic_mm_hg",
"heart_rate_bpm",
"spo2_percent",
"potassium_mmol_l",
"troponin_gt_uln",
"active_cancer",
"metolazone",
"dialysis_dependent"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 18-120). Lee 2012 Table 3 adds +2 per year. magent does not assign age."
},
"metolazone": {
"type": "boolean",
"description": "Metolazone at home as assigned by the caller (true or false). Lee 2012 Table 3: +60 if true."
},
"spo2_percent": {
"type": "number",
"description": "Lowest initial/triage oxygen saturation percent (50-100). Lee 2012 Table 3 scores -2 * min(SpO2, 92); values above 92% are capped. magent does not measure saturation."
},
"active_cancer": {
"type": "boolean",
"description": "Active cancer as assigned by the caller (true or false). Lee 2012 Table 3: +45 if true."
},
"ems_transport": {
"type": "boolean",
"description": "Transported by EMS as assigned by the caller (true or false). Lee 2012 Table 3: +60 if true."
},
"heart_rate_bpm": {
"type": "integer",
"description": "Heart rate in beats/min (integer 30-220). Lee 2012 Table 3 scores +1 * clamp(HR, 80, 120): floor 80, ceiling 120. magent does not measure heart rate."
},
"systolic_mm_hg": {
"type": "integer",
"description": "Initial/triage systolic blood pressure in mm Hg (integer 50-250). Lee 2012 Table 3 scores -1 * min(SBP, 160); values above 160 mm Hg are capped. magent does not measure blood pressure."
},
"troponin_gt_uln": {
"type": "boolean",
"description": "Troponin above the local upper limit of normal as assigned by the caller (true or false). Lee 2012 Table 3: +60 if true."
},
"creatinine_mg_dl": {
"type": "number",
"description": "Serum creatinine in mg/dL (0.1-20). Provide this or creatinine_umol_l, not both. Lee 2012 Table 3 adds +20 per mg/dL. magent does not measure creatinine."
},
"potassium_mmol_l": {
"type": "number",
"description": "Serum potassium in mmol/L (1.5-8.0). Lee 2012 Table 3: 4.0-4.5 inclusive → 0; >=4.6 → +30; <=3.9 → +5. Unpublished 3.91-3.99 pin with <=3.9; 4.51-4.59 pin with >=4.6. magent does not measure potassium."
},
"creatinine_umol_l": {
"type": "number",
"description": "Serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42. Provide this or creatinine_mg_dl, not both."
},
"dialysis_dependent": {
"type": "boolean",
"description": "Dialysis dependence as assigned by the caller (true or false). Lee 2012 excludes dialysis-dependent patients; true returns HTTP 400. magent does not determine dialysis status."
}
}
},
"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 13:24Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-10 06:15Z
- 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/ehmrg, 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.