magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
DataLiveeip155:8453Exactvia cdp
EsusStrokeNeurologyCryptogenicEmbolic
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 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 13:36Z
—
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/esus",
"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/esus",
"tags": [
"esus",
"stroke",
"neurology",
"cryptogenic",
"embolic"
],
"mimeType": "application/json",
"description": "ESUS (Hart 2014). True iff all five caller-assigned flags hold: non-lacunar infarct on CT/MRI; no ≥50% stenosis supplying the ischaemia; no major-risk cardioembolic source; no other specific cause; and Panel 3 minimum workup (brain CT/MRI, 12-lead ECG, precordial echo, ≥24 h automated rhythm monitoring (not telemetry), extra- and intracranial arterial imaging). Incomplete workup is not ESUS. Not a stroke diagnosis, not TOAST cryptogenic, not anticoagulation. magent does not read imaging.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"minimum_workup": true,
"no_stenosis_ge_50": true,
"non_lacunar_infarct": true,
"no_other_specific_cause": true,
"no_major_risk_cardioembolic": true
}
},
"output": {
"type": "json",
"example": {
"esus": true,
"formula": "esus",
"citation": {
"id": "hart-2014",
"doi": "10.1016/S1474-4422(13)70310-7",
"pmid": "24646875",
"title": "Embolic strokes of undetermined source: the case for a new clinical construct",
"source": "Lancet Neurol. 2014;13(4):429-438",
"authors": "Hart RG, Diener HC, Coutts SB, Easton JD, Granger CB, O'Donnell MJ, Sacco RL, Connolly SJ, Cryptogenic Stroke/ESUS International Working Group"
},
"criteria": [
{
"met": true,
"factor": "non_lacunar_infarct"
},
{
"met": true,
"factor": "no_stenosis_ge_50"
},
{
"met": true,
"factor": "no_major_risk_cardioembolic"
},
{
"met": true,
"factor": "no_other_specific_cause"
},
{
"met": true,
"factor": "minimum_workup"
}
],
"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.",
"formula_expression": "esus iff non_lacunar_infarct and no_stenosis_ge_50 and no_major_risk_cardioembolic and no_other_specific_cause and minimum_workup (Hart 2014 Panel 2 + Panel 3)"
}
},
"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": [
"non_lacunar_infarct",
"no_stenosis_ge_50",
"no_major_risk_cardioembolic",
"no_other_specific_cause",
"minimum_workup"
],
"properties": {
"minimum_workup": {
"type": "boolean",
"description": "Hart 2014 Panel 3 minimum diagnostic assessment, as assigned by the caller. true only if brain CT or MRI, 12-lead ECG, precordial echocardiography, cardiac monitoring for ≥24 h with automated rhythm detection (telemetry is not sufficient), and imaging of both extracranial and intracranial arteries supplying the ischaemic territory have been done. Incomplete workup returns esus false (not HTTP 400). true or false. magent does not read imaging."
},
"no_stenosis_ge_50": {
"type": "boolean",
"description": "Absence of extracranial or intracranial atherosclerosis causing ≥50% luminal stenosis in arteries supplying the area of ischaemia, as assigned by the caller (Hart 2014 Panel 2). true means no such stenosis. true or false. magent does not read vascular imaging."
},
"non_lacunar_infarct": {
"type": "boolean",
"description": "Stroke detected by CT or MRI that is not lacunar, as assigned by the caller (Hart 2014 Panel 2). Lacunar = subcortical infarct ≤1.5 cm (≤2.0 cm on MRI diffusion images) in largest dimension, in the distribution of the small penetrating cerebral arteries. true or false. magent does not read imaging."
},
"no_other_specific_cause": {
"type": "boolean",
"description": "No other specific cause identified, as assigned by the caller (Hart 2014 Panel 2). Paper examples: arteritis, dissection, migraine/vasospasm, drug misuse. true or false. magent does not diagnose an alternative aetiology."
},
"no_major_risk_cardioembolic": {
"type": "boolean",
"description": "No major-risk cardioembolic source, as assigned by the caller (Hart 2014 Panel 2). Major-risk sources (paper footnote): permanent or paroxysmal atrial fibrillation, sustained atrial flutter, intracardiac thrombus, prosthetic cardiac valve, atrial myxoma or other cardiac tumours, mitral stenosis, recent (<4 weeks) myocardial infarction, left ventricular ejection fraction less than 30%, valvular vegetations, or infective endocarditis. true or false. The caller assigns this boolean; magent does not enumerate each source as a separate required param."
}
}
}
},
"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/esus",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"minimum_workup": true,
"no_stenosis_ge_50": true,
"non_lacunar_infarct": true,
"no_other_specific_cause": true,
"no_major_risk_cardioembolic": true
},
{
"minimum_workup": true,
"no_stenosis_ge_50": true,
"non_lacunar_infarct": true,
"no_other_specific_cause": true,
"no_major_risk_cardioembolic": true
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/esus",
"count": 2,
"items": [
{
"esus": true,
"formula": "esus",
"citation": {
"id": "hart-2014",
"doi": "10.1016/S1474-4422(13)70310-7",
"pmid": "24646875",
"title": "Embolic strokes of undetermined source: the case for a new clinical construct",
"source": "Lancet Neurol. 2014;13(4):429-438",
"authors": "Hart RG, Diener HC, Coutts SB, Easton JD, Granger CB, O'Donnell MJ, Sacco RL, Connolly SJ, Cryptogenic Stroke/ESUS International Working Group"
},
"criteria": [
{
"met": true,
"factor": "non_lacunar_infarct"
},
{
"met": true,
"factor": "no_stenosis_ge_50"
},
{
"met": true,
"factor": "no_major_risk_cardioembolic"
},
{
"met": true,
"factor": "no_other_specific_cause"
},
{
"met": true,
"factor": "minimum_workup"
}
],
"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.",
"formula_expression": "esus iff non_lacunar_infarct and no_stenosis_ge_50 and no_major_risk_cardioembolic and no_other_specific_cause and minimum_workup (Hart 2014 Panel 2 + Panel 3)"
},
{
"esus": true,
"formula": "esus",
"citation": {
"id": "hart-2014",
"doi": "10.1016/S1474-4422(13)70310-7",
"pmid": "24646875",
"title": "Embolic strokes of undetermined source: the case for a new clinical construct",
"source": "Lancet Neurol. 2014;13(4):429-438",
"authors": "Hart RG, Diener HC, Coutts SB, Easton JD, Granger CB, O'Donnell MJ, Sacco RL, Connolly SJ, Cryptogenic Stroke/ESUS International Working Group"
},
"criteria": [
{
"met": true,
"factor": "non_lacunar_infarct"
},
{
"met": true,
"factor": "no_stenosis_ge_50"
},
{
"met": true,
"factor": "no_major_risk_cardioembolic"
},
{
"met": true,
"factor": "no_other_specific_cause"
},
{
"met": true,
"factor": "minimum_workup"
}
],
"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.",
"formula_expression": "esus iff non_lacunar_infarct and no_stenosis_ge_50 and no_major_risk_cardioembolic and no_other_specific_cause and minimum_workup (Hart 2014 Panel 2 + Panel 3)"
}
]
}
},
"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": [
"non_lacunar_infarct",
"no_stenosis_ge_50",
"no_major_risk_cardioembolic",
"no_other_specific_cause",
"minimum_workup"
],
"properties": {
"minimum_workup": {
"type": "boolean",
"description": "Hart 2014 Panel 3 minimum diagnostic assessment, as assigned by the caller. true only if brain CT or MRI, 12-lead ECG, precordial echocardiography, cardiac monitoring for ≥24 h with automated rhythm detection (telemetry is not sufficient), and imaging of both extracranial and intracranial arteries supplying the ischaemic territory have been done. Incomplete workup returns esus false (not HTTP 400). true or false. magent does not read imaging."
},
"no_stenosis_ge_50": {
"type": "boolean",
"description": "Absence of extracranial or intracranial atherosclerosis causing ≥50% luminal stenosis in arteries supplying the area of ischaemia, as assigned by the caller (Hart 2014 Panel 2). true means no such stenosis. true or false. magent does not read vascular imaging."
},
"non_lacunar_infarct": {
"type": "boolean",
"description": "Stroke detected by CT or MRI that is not lacunar, as assigned by the caller (Hart 2014 Panel 2). Lacunar = subcortical infarct ≤1.5 cm (≤2.0 cm on MRI diffusion images) in largest dimension, in the distribution of the small penetrating cerebral arteries. true or false. magent does not read imaging."
},
"no_other_specific_cause": {
"type": "boolean",
"description": "No other specific cause identified, as assigned by the caller (Hart 2014 Panel 2). Paper examples: arteritis, dissection, migraine/vasospasm, drug misuse. true or false. magent does not diagnose an alternative aetiology."
},
"no_major_risk_cardioembolic": {
"type": "boolean",
"description": "No major-risk cardioembolic source, as assigned by the caller (Hart 2014 Panel 2). Major-risk sources (paper footnote): permanent or paroxysmal atrial fibrillation, sustained atrial flutter, intracardiac thrombus, prosthetic cardiac valve, atrial myxoma or other cardiac tumours, mitral stenosis, recent (<4 weeks) myocardial infarction, left ventricular ejection fraction less than 30%, valvular vegetations, or infective endocarditis. true or false. The caller assigns this boolean; magent does not enumerate each source as a separate required param."
}
}
},
"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 13:36Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-22 09:15Z
- 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. 10 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/esus, 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.