magent
Tisdale 2013 QT prolongation risk score (Table 5): age ≥68 (1), female (1), loop diuretic (1), potassium ≤3.5 mmol/L (2), admission QTc ≥450 ms (2), acute MI (2), sepsis (3), heart failure (3), one QTc-prolonging drug (3) plus ≥2 drugs (3 stacked; max 21). Returns bands 0-6 / 7-10 / ≥11. Deterministic published arithmetic with citation; not a medical device, not a drug-stop protocol, and not a TdP diagnosis.
DataLiveeip155:8453Exactvia cdp
TisdaleQtcQt-prolongationEcgCalculator
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 14 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 13:13Z
—
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/tisdale",
"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/tisdale",
"tags": [
"tisdale",
"qtc",
"qt-prolongation",
"ecg",
"calculator"
],
"mimeType": "application/json",
"description": "Tisdale 2013 QT prolongation risk score (Table 5): age ≥68 (1), female (1), loop diuretic (1), potassium ≤3.5 mmol/L (2), admission QTc ≥450 ms (2), acute MI (2), sepsis (3), heart failure (3), one QTc-prolonging drug (3) plus ≥2 drugs (3 stacked; max 21). Returns bands 0-6 / 7-10 / ≥11. Deterministic published arithmetic with citation; not a medical device, not a drug-stop protocol, and not a TdP diagnosis.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 60,
"sex": "male",
"sepsis": false,
"acute_mi": false,
"heart_failure": false,
"loop_diuretic": false,
"admission_qtc_ms": 400,
"potassium_mmol_l": 4,
"qtc_prolonging_drugs": 0
}
},
"output": {
"type": "json",
"example": {
"sex": "male",
"score": 0,
"formula": "tisdale",
"citation": {
"id": "tisdale-2013",
"doi": "10.1161/CIRCOUTCOMES.113.000152",
"pmid": "23716032",
"title": "Development and validation of a risk score to predict QT interval prolongation in hospitalized patients",
"source": "Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487",
"authors": "Tisdale JE, Jaynes HA, Kingery JR, et al."
},
"age_years": 60,
"max_score": 21,
"components": [
{
"value": 60,
"factor": "age_ge_68",
"points": 0,
"present": false
},
{
"factor": "female",
"points": 0,
"present": false
},
{
"factor": "loop_diuretic",
"points": 0,
"present": false
},
{
"value": 4,
"factor": "potassium_le_3_5",
"points": 0,
"present": false
},
{
"value": 400,
"factor": "admission_qtc_ge_450",
"points": 0,
"present": false
},
{
"factor": "acute_mi",
"points": 0,
"present": false
},
{
"factor": "sepsis",
"points": 0,
"present": false
},
{
"factor": "heart_failure",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "one_qtc_prolonging_drug",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "two_or_more_qtc_prolonging_drugs",
"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.",
"tisdale_band": "0-6",
"admission_qtc_ms": 400,
"potassium_mmol_l": 4,
"formula_expression": "Tisdale = age≥68 1 + female 1 + loop_diuretic 1 + potassium≤3.5 2 + admission_QTc≥450 2 + acute_MI 2 + sepsis 3 + heart_failure 3 + one_QTc_prolonging_drug 3 + ≥2_QTc_prolonging_drugs 3; Table 5; max 21; bands 0-6 / 7-10 / ≥11",
"qtc_prolonging_drugs": 0
}
},
"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",
"loop_diuretic",
"potassium_mmol_l",
"admission_qtc_ms",
"acute_mi",
"sepsis",
"heart_failure",
"qtc_prolonging_drugs"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Age ≥68 scores 1 (Tisdale 2013 Table 5). 67 does not score."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "female scores 1; male scores 0 (Tisdale 2013 Table 5)."
},
"sepsis": {
"type": "boolean",
"description": "Sepsis (Tisdale 2013 Table 5). true or false. Scores 3 if true."
},
"acute_mi": {
"type": "boolean",
"description": "Acute myocardial infarction (Tisdale 2013 Table 5). true or false. Scores 2 if true."
},
"heart_failure": {
"type": "boolean",
"description": "Left ventricular dysfunction / heart failure (Tisdale 2013 Table 5). true or false. Scores 3 if true."
},
"loop_diuretic": {
"type": "boolean",
"description": "Loop diuretic (Tisdale 2013 Table 5). true or false. Scores 1 if true."
},
"admission_qtc_ms": {
"type": "number",
"description": "Admission QTc in milliseconds (200-800). ≥450 scores 2 (Tisdale 2013 Table 5). 450 scores."
},
"potassium_mmol_l": {
"type": "number",
"description": "Serum potassium in mmol/L (1.5-8.0). ≤3.5 scores 2 (Tisdale 2013 Table 5). 3.5 scores; 3.51 does not."
},
"qtc_prolonging_drugs": {
"type": "integer",
"description": "Count of QTc-prolonging drugs (integer 0-20). 0 → 0 points; 1 → 3 points; ≥2 → 6 points (Table 5 one-drug and ≥2-drug rows stack)."
}
}
}
},
"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/tisdale",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 60,
"sex": "male",
"sepsis": false,
"acute_mi": false,
"heart_failure": false,
"loop_diuretic": false,
"admission_qtc_ms": 400,
"potassium_mmol_l": 4,
"qtc_prolonging_drugs": 0
},
{
"age": 60,
"sex": "male",
"sepsis": false,
"acute_mi": false,
"heart_failure": false,
"loop_diuretic": false,
"admission_qtc_ms": 400,
"potassium_mmol_l": 4,
"qtc_prolonging_drugs": 0
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/tisdale",
"count": 2,
"items": [
{
"sex": "male",
"score": 0,
"formula": "tisdale",
"citation": {
"id": "tisdale-2013",
"doi": "10.1161/CIRCOUTCOMES.113.000152",
"pmid": "23716032",
"title": "Development and validation of a risk score to predict QT interval prolongation in hospitalized patients",
"source": "Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487",
"authors": "Tisdale JE, Jaynes HA, Kingery JR, et al."
},
"age_years": 60,
"max_score": 21,
"components": [
{
"value": 60,
"factor": "age_ge_68",
"points": 0,
"present": false
},
{
"factor": "female",
"points": 0,
"present": false
},
{
"factor": "loop_diuretic",
"points": 0,
"present": false
},
{
"value": 4,
"factor": "potassium_le_3_5",
"points": 0,
"present": false
},
{
"value": 400,
"factor": "admission_qtc_ge_450",
"points": 0,
"present": false
},
{
"factor": "acute_mi",
"points": 0,
"present": false
},
{
"factor": "sepsis",
"points": 0,
"present": false
},
{
"factor": "heart_failure",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "one_qtc_prolonging_drug",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "two_or_more_qtc_prolonging_drugs",
"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.",
"tisdale_band": "0-6",
"admission_qtc_ms": 400,
"potassium_mmol_l": 4,
"formula_expression": "Tisdale = age≥68 1 + female 1 + loop_diuretic 1 + potassium≤3.5 2 + admission_QTc≥450 2 + acute_MI 2 + sepsis 3 + heart_failure 3 + one_QTc_prolonging_drug 3 + ≥2_QTc_prolonging_drugs 3; Table 5; max 21; bands 0-6 / 7-10 / ≥11",
"qtc_prolonging_drugs": 0
},
{
"sex": "male",
"score": 0,
"formula": "tisdale",
"citation": {
"id": "tisdale-2013",
"doi": "10.1161/CIRCOUTCOMES.113.000152",
"pmid": "23716032",
"title": "Development and validation of a risk score to predict QT interval prolongation in hospitalized patients",
"source": "Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487",
"authors": "Tisdale JE, Jaynes HA, Kingery JR, et al."
},
"age_years": 60,
"max_score": 21,
"components": [
{
"value": 60,
"factor": "age_ge_68",
"points": 0,
"present": false
},
{
"factor": "female",
"points": 0,
"present": false
},
{
"factor": "loop_diuretic",
"points": 0,
"present": false
},
{
"value": 4,
"factor": "potassium_le_3_5",
"points": 0,
"present": false
},
{
"value": 400,
"factor": "admission_qtc_ge_450",
"points": 0,
"present": false
},
{
"factor": "acute_mi",
"points": 0,
"present": false
},
{
"factor": "sepsis",
"points": 0,
"present": false
},
{
"factor": "heart_failure",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "one_qtc_prolonging_drug",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "two_or_more_qtc_prolonging_drugs",
"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.",
"tisdale_band": "0-6",
"admission_qtc_ms": 400,
"potassium_mmol_l": 4,
"formula_expression": "Tisdale = age≥68 1 + female 1 + loop_diuretic 1 + potassium≤3.5 2 + admission_QTc≥450 2 + acute_MI 2 + sepsis 3 + heart_failure 3 + one_QTc_prolonging_drug 3 + ≥2_QTc_prolonging_drugs 3; Table 5; max 21; bands 0-6 / 7-10 / ≥11",
"qtc_prolonging_drugs": 0
}
]
}
},
"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",
"loop_diuretic",
"potassium_mmol_l",
"admission_qtc_ms",
"acute_mi",
"sepsis",
"heart_failure",
"qtc_prolonging_drugs"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Age ≥68 scores 1 (Tisdale 2013 Table 5). 67 does not score."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "female scores 1; male scores 0 (Tisdale 2013 Table 5)."
},
"sepsis": {
"type": "boolean",
"description": "Sepsis (Tisdale 2013 Table 5). true or false. Scores 3 if true."
},
"acute_mi": {
"type": "boolean",
"description": "Acute myocardial infarction (Tisdale 2013 Table 5). true or false. Scores 2 if true."
},
"heart_failure": {
"type": "boolean",
"description": "Left ventricular dysfunction / heart failure (Tisdale 2013 Table 5). true or false. Scores 3 if true."
},
"loop_diuretic": {
"type": "boolean",
"description": "Loop diuretic (Tisdale 2013 Table 5). true or false. Scores 1 if true."
},
"admission_qtc_ms": {
"type": "number",
"description": "Admission QTc in milliseconds (200-800). ≥450 scores 2 (Tisdale 2013 Table 5). 450 scores."
},
"potassium_mmol_l": {
"type": "number",
"description": "Serum potassium in mmol/L (1.5-8.0). ≤3.5 scores 2 (Tisdale 2013 Table 5). 3.5 scores; 3.51 does not."
},
"qtc_prolonging_drugs": {
"type": "integer",
"description": "Count of QTc-prolonging drugs (integer 0-20). 0 → 0 points; 1 → 3 points; ≥2 → 6 points (Table 5 one-drug and ≥2-drug rows stack)."
}
}
},
"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 13:13Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 04:45Z
- x402 version
- 2
- Max timeout
- 600s
- Liveness probe
- HTTP 402
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. 14 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/tisdale, 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.