magent
Maupain 2016 CAHP nomogram after OHCA. Integer points from age, home vs public arrest, shockable vs non-shockable rhythm, no-flow min, low-flow min, epinephrine tertile (0 / 1-2 / >=3 mg), and arterial pH. Table 3: low <150, medium 150-200, high >200. Figure 2 caption total 177 reads 88% poor outcome. Not a withdrawal-of-care order. magent does not measure pH.
Tradingofflineeip155:8453Exactvia cdp
CahpCardiac-arrestOhcaPrognosisCalculator
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 04:54Z
—
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/cahp",
"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/cahp",
"tags": [
"cahp",
"cardiac-arrest",
"ohca",
"prognosis",
"calculator"
],
"mimeType": "application/json",
"description": "Maupain 2016 CAHP nomogram after OHCA. Integer points from age, home vs public arrest, shockable vs non-shockable rhythm, no-flow min, low-flow min, epinephrine tertile (0 / 1-2 / >=3 mg), and arterial pH. Table 3: low <150, medium 150-200, high >200. Figure 2 caption total 177 reads 88% poor outcome. Not a withdrawal-of-care order. magent does not measure pH.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 30,
"arterial_ph": 7.1,
"no_flow_min": 5,
"low_flow_min": 10,
"arrest_at_home": true,
"epinephrine_mg": 3,
"shockable_rhythm": false
}
},
"output": {
"type": "json",
"example": {
"score": 177,
"formula": "cahp",
"citation": {
"id": "maupain-2016-cahp",
"doi": "10.1093/eurheartj/ehv556",
"pmid": "26497161",
"title": "The CAHP (Cardiac Arrest Hospital Prognosis) score: a tool for risk stratification after out-of-hospital cardiac arrest",
"source": "Eur Heart J. 2016;37(42):3222-3231",
"authors": "Maupain C, Bougouin W, Lamhaut L, et al."
},
"age_years": 30,
"cahp_risk": "medium",
"max_score": 411,
"components": [
{
"value": 30,
"factor": "age",
"points": 22,
"present": true
},
{
"factor": "arrest_at_home",
"points": 25,
"present": true
},
{
"value": false,
"factor": "shockable_rhythm",
"points": 27,
"present": true
},
{
"value": 5,
"factor": "no_flow_min",
"points": 14,
"present": true
},
{
"value": 10,
"factor": "low_flow_min",
"points": 8,
"present": true
},
{
"value": 3,
"factor": "epinephrine_mg",
"points": 43,
"present": true
},
{
"value": 7.1,
"factor": "arterial_ph",
"points": 38,
"present": true
}
],
"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.",
"arterial_ph": 7.1,
"no_flow_min": 5,
"low_flow_min": 10,
"arrest_at_home": true,
"epinephrine_mg": 3,
"shockable_rhythm": false,
"formula_expression": "CAHP = round(1.1*(age-10)) + 25 if arrest_at_home + 27 if not shockable_rhythm + round(2.8*no_flow_min) + round(0.8*low_flow_min) + epinephrine mg (0 → 0; 1-2 → 27; ≥3 → 43) + round(585-77*arterial_ph); Maupain 2016 Figure 2 nomogram integer points (caption: age 30 → 22, home → 25, non-shockable → 27, no-flow 5 min → 14, low-flow 10 min → 8, epinephrine 3 mg → 43, pH 7.10 → 38, total 177 → 88%); Table 3 low <150, medium 150-200, high >200 (150 and 200 are medium); max 411",
"nomogram_poor_outcome_percent": 88
}
},
"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",
"arrest_at_home",
"shockable_rhythm",
"no_flow_min",
"low_flow_min",
"epinephrine_mg",
"arterial_ph"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Figure 2 caption: 30 years → 22. Linear nomogram: round(1.1*(age-10)); truncated below 10 and above 100."
},
"arterial_ph": {
"type": "number",
"description": "Admission arterial pH (6.5-7.8). Figure 2 caption: 7.10 → 38. Linear nomogram: round(585-77*pH); truncated to 6.5-7.5. magent does not measure pH."
},
"no_flow_min": {
"type": "integer",
"description": "Collapse-to-BLS (no-flow) minutes (integer 0-90). Figure 2 caption: 5 min → 14. Linear nomogram: round(2.8*minutes); truncated above 30."
},
"low_flow_min": {
"type": "integer",
"description": "BLS-to-ROSC (low-flow) minutes (integer 0-180). Figure 2 caption: 10 min → 8. Linear nomogram: round(0.8*minutes); truncated above 60."
},
"arrest_at_home": {
"type": "boolean",
"description": "Cardiac arrest at home versus public, as assigned by the caller. true scores 25 (Figure 2 caption); false (public) scores 0."
},
"epinephrine_mg": {
"type": "integer",
"description": "Total pre-ROSC epinephrine in mg (integer 0-30). Table 2 tertiles on the nomogram: 0 → 0; 1-2 → 27; ≥3 → 43 (Figure 2 caption 3 mg → 43)."
},
"shockable_rhythm": {
"type": "boolean",
"description": "Initial shockable rhythm (VF or pulseless VT) as assigned by the caller. true scores 0; false (non-shockable) scores 27 (Figure 2 caption)."
}
}
}
},
"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/cahp",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 30,
"arterial_ph": 7.1,
"no_flow_min": 5,
"low_flow_min": 10,
"arrest_at_home": true,
"epinephrine_mg": 3,
"shockable_rhythm": false
},
{
"age": 30,
"arterial_ph": 7.1,
"no_flow_min": 5,
"low_flow_min": 10,
"arrest_at_home": true,
"epinephrine_mg": 3,
"shockable_rhythm": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/cahp",
"count": 2,
"items": [
{
"score": 177,
"formula": "cahp",
"citation": {
"id": "maupain-2016-cahp",
"doi": "10.1093/eurheartj/ehv556",
"pmid": "26497161",
"title": "The CAHP (Cardiac Arrest Hospital Prognosis) score: a tool for risk stratification after out-of-hospital cardiac arrest",
"source": "Eur Heart J. 2016;37(42):3222-3231",
"authors": "Maupain C, Bougouin W, Lamhaut L, et al."
},
"age_years": 30,
"cahp_risk": "medium",
"max_score": 411,
"components": [
{
"value": 30,
"factor": "age",
"points": 22,
"present": true
},
{
"factor": "arrest_at_home",
"points": 25,
"present": true
},
{
"value": false,
"factor": "shockable_rhythm",
"points": 27,
"present": true
},
{
"value": 5,
"factor": "no_flow_min",
"points": 14,
"present": true
},
{
"value": 10,
"factor": "low_flow_min",
"points": 8,
"present": true
},
{
"value": 3,
"factor": "epinephrine_mg",
"points": 43,
"present": true
},
{
"value": 7.1,
"factor": "arterial_ph",
"points": 38,
"present": true
}
],
"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.",
"arterial_ph": 7.1,
"no_flow_min": 5,
"low_flow_min": 10,
"arrest_at_home": true,
"epinephrine_mg": 3,
"shockable_rhythm": false,
"formula_expression": "CAHP = round(1.1*(age-10)) + 25 if arrest_at_home + 27 if not shockable_rhythm + round(2.8*no_flow_min) + round(0.8*low_flow_min) + epinephrine mg (0 → 0; 1-2 → 27; ≥3 → 43) + round(585-77*arterial_ph); Maupain 2016 Figure 2 nomogram integer points (caption: age 30 → 22, home → 25, non-shockable → 27, no-flow 5 min → 14, low-flow 10 min → 8, epinephrine 3 mg → 43, pH 7.10 → 38, total 177 → 88%); Table 3 low <150, medium 150-200, high >200 (150 and 200 are medium); max 411",
"nomogram_poor_outcome_percent": 88
},
{
"score": 177,
"formula": "cahp",
"citation": {
"id": "maupain-2016-cahp",
"doi": "10.1093/eurheartj/ehv556",
"pmid": "26497161",
"title": "The CAHP (Cardiac Arrest Hospital Prognosis) score: a tool for risk stratification after out-of-hospital cardiac arrest",
"source": "Eur Heart J. 2016;37(42):3222-3231",
"authors": "Maupain C, Bougouin W, Lamhaut L, et al."
},
"age_years": 30,
"cahp_risk": "medium",
"max_score": 411,
"components": [
{
"value": 30,
"factor": "age",
"points": 22,
"present": true
},
{
"factor": "arrest_at_home",
"points": 25,
"present": true
},
{
"value": false,
"factor": "shockable_rhythm",
"points": 27,
"present": true
},
{
"value": 5,
"factor": "no_flow_min",
"points": 14,
"present": true
},
{
"value": 10,
"factor": "low_flow_min",
"points": 8,
"present": true
},
{
"value": 3,
"factor": "epinephrine_mg",
"points": 43,
"present": true
},
{
"value": 7.1,
"factor": "arterial_ph",
"points": 38,
"present": true
}
],
"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.",
"arterial_ph": 7.1,
"no_flow_min": 5,
"low_flow_min": 10,
"arrest_at_home": true,
"epinephrine_mg": 3,
"shockable_rhythm": false,
"formula_expression": "CAHP = round(1.1*(age-10)) + 25 if arrest_at_home + 27 if not shockable_rhythm + round(2.8*no_flow_min) + round(0.8*low_flow_min) + epinephrine mg (0 → 0; 1-2 → 27; ≥3 → 43) + round(585-77*arterial_ph); Maupain 2016 Figure 2 nomogram integer points (caption: age 30 → 22, home → 25, non-shockable → 27, no-flow 5 min → 14, low-flow 10 min → 8, epinephrine 3 mg → 43, pH 7.10 → 38, total 177 → 88%); Table 3 low <150, medium 150-200, high >200 (150 and 200 are medium); max 411",
"nomogram_poor_outcome_percent": 88
}
]
}
},
"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",
"arrest_at_home",
"shockable_rhythm",
"no_flow_min",
"low_flow_min",
"epinephrine_mg",
"arterial_ph"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Figure 2 caption: 30 years → 22. Linear nomogram: round(1.1*(age-10)); truncated below 10 and above 100."
},
"arterial_ph": {
"type": "number",
"description": "Admission arterial pH (6.5-7.8). Figure 2 caption: 7.10 → 38. Linear nomogram: round(585-77*pH); truncated to 6.5-7.5. magent does not measure pH."
},
"no_flow_min": {
"type": "integer",
"description": "Collapse-to-BLS (no-flow) minutes (integer 0-90). Figure 2 caption: 5 min → 14. Linear nomogram: round(2.8*minutes); truncated above 30."
},
"low_flow_min": {
"type": "integer",
"description": "BLS-to-ROSC (low-flow) minutes (integer 0-180). Figure 2 caption: 10 min → 8. Linear nomogram: round(0.8*minutes); truncated above 60."
},
"arrest_at_home": {
"type": "boolean",
"description": "Cardiac arrest at home versus public, as assigned by the caller. true scores 25 (Figure 2 caption); false (public) scores 0."
},
"epinephrine_mg": {
"type": "integer",
"description": "Total pre-ROSC epinephrine in mg (integer 0-30). Table 2 tertiles on the nomogram: 0 → 0; 1-2 → 27; ≥3 → 43 (Figure 2 caption 3 mg → 43)."
},
"shockable_rhythm": {
"type": "boolean",
"description": "Initial shockable rhythm (VF or pulseless VT) as assigned by the caller. true scores 0; false (non-shockable) scores 27 (Figure 2 caption)."
}
}
},
"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 04:54Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-12 15:45Z
- 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/cahp, 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.