magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Searchofflineeip155:8453Exactvia cdp
InterchestAcsChest-painPrimary-careCalculator
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 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 13:04Z
—
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/interchest",
"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/interchest",
"tags": [
"interchest",
"acs",
"chest-pain",
"primary-care",
"calculator"
],
"mimeType": "application/json",
"description": "Aerts 2017 INTERCHEST: six equally weighted predictors for CAD in primary-care chest pain (age ≥55 male or ≥65 female +1; physician suspected serious +1; history of CAD +1; pain on exertion +1; pressure quality +1; pain reproducible on palpation −1). Range −1 to 5. CAD considered absent iff score <2. Published CAD probability 2.1% (95% CI 1.1–3.9) when <2 and 43.0% (35.8–50.4) when ≥2 in the 13.2% prevalence setting. Not HEART, not EDACS. magent does not examine the chest.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 40,
"sex": "female",
"history_of_cad": false,
"pain_on_exertion": false,
"pressure_quality": false,
"physician_suspected_serious": false,
"pain_reproducible_on_palpation": false
}
},
"output": {
"type": "json",
"example": {
"sex": "female",
"score": 0,
"formula": "interchest",
"citation": {
"id": "aerts-2017",
"doi": "10.1016/j.jclinepi.2016.09.011",
"pmid": "27773828",
"title": "Pooled individual patient data from five countries were used to derive a clinical prediction rule for coronary artery disease in primary care",
"source": "J Clin Epidemiol. 2017;81:120-128",
"authors": "Aerts M, Minalu G, Bösner S, Buntinx F, Burnand B, Haasenritter J, Herzig L, Knottnerus JA, Nilsson S, Renier W, Sox C, Sox H, Donner-Banzhoff N, International Working Group on Chest Pain in Primary Care (INTERCHEST)"
},
"age_years": 40,
"max_score": 5,
"min_score": -1,
"cad_absent": true,
"components": [
{
"value": 40,
"factor": "age_sex",
"points": 0,
"present": false
},
{
"factor": "physician_suspected_serious",
"points": 0,
"present": false
},
{
"factor": "history_of_cad",
"points": 0,
"present": false
},
{
"factor": "pain_on_exertion",
"points": 0,
"present": false
},
{
"factor": "pressure_quality",
"points": 0,
"present": false
},
{
"factor": "pain_reproducible_on_palpation",
"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.",
"formula_expression": "INTERCHEST = (age ≥55 if male or ≥65 if female) + physician_suspected_serious + history_of_cad + pain_on_exertion + pressure_quality − pain_reproducible_on_palpation; each ±1; range −1 to 5; CAD considered absent iff score <2 (Aerts 2017); CAD probability 2.1% (95% CI 1.1–3.9) when <2 and 43.0% (35.8–50.4) when ≥2 in the 13.2% prevalence setting",
"cad_probability_percent": 2.1,
"prevalence_setting_percent": 13.2,
"cad_probability_ci_low_percent": 1.1,
"cad_probability_ci_high_percent": 3.9
}
},
"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",
"physician_suspected_serious",
"history_of_cad",
"pain_on_exertion",
"pressure_quality",
"pain_reproducible_on_palpation"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Combined with sex: female ≥65 or male ≥55 scores 1 (Aerts 2017). Age 54 male does not score; 55 male does. Age 64 female does not; 65 female does. magent computes this; do not send a precomputed flag."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "female or male (required). Combined with age: female ≥65 or male ≥55 scores 1 (Aerts 2017)."
},
"history_of_cad": {
"type": "boolean",
"description": "History of coronary artery disease (Aerts 2017). true or false as assigned by the caller. magent does not take a cardiac history. +1 if true."
},
"pain_on_exertion": {
"type": "boolean",
"description": "Pain related to exertion (Aerts 2017). true or false as assigned by the caller. +1 if true."
},
"pressure_quality": {
"type": "boolean",
"description": "Pain has a pressure quality (Aerts 2017). true or false as assigned by the caller. +1 if true."
},
"physician_suspected_serious": {
"type": "boolean",
"description": "Physician initially suspected a serious diagnosis (Aerts 2017). true or false as assigned by the caller. magent does not examine the chest. +1 if true."
},
"pain_reproducible_on_palpation": {
"type": "boolean",
"description": "Pain reproducible on chest-wall palpation (Aerts 2017). true or false as assigned by the caller. magent does not examine the chest. −1 if true."
}
}
}
},
"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/interchest",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 40,
"sex": "female",
"history_of_cad": false,
"pain_on_exertion": false,
"pressure_quality": false,
"physician_suspected_serious": false,
"pain_reproducible_on_palpation": false
},
{
"age": 40,
"sex": "female",
"history_of_cad": false,
"pain_on_exertion": false,
"pressure_quality": false,
"physician_suspected_serious": false,
"pain_reproducible_on_palpation": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/interchest",
"count": 2,
"items": [
{
"sex": "female",
"score": 0,
"formula": "interchest",
"citation": {
"id": "aerts-2017",
"doi": "10.1016/j.jclinepi.2016.09.011",
"pmid": "27773828",
"title": "Pooled individual patient data from five countries were used to derive a clinical prediction rule for coronary artery disease in primary care",
"source": "J Clin Epidemiol. 2017;81:120-128",
"authors": "Aerts M, Minalu G, Bösner S, Buntinx F, Burnand B, Haasenritter J, Herzig L, Knottnerus JA, Nilsson S, Renier W, Sox C, Sox H, Donner-Banzhoff N, International Working Group on Chest Pain in Primary Care (INTERCHEST)"
},
"age_years": 40,
"max_score": 5,
"min_score": -1,
"cad_absent": true,
"components": [
{
"value": 40,
"factor": "age_sex",
"points": 0,
"present": false
},
{
"factor": "physician_suspected_serious",
"points": 0,
"present": false
},
{
"factor": "history_of_cad",
"points": 0,
"present": false
},
{
"factor": "pain_on_exertion",
"points": 0,
"present": false
},
{
"factor": "pressure_quality",
"points": 0,
"present": false
},
{
"factor": "pain_reproducible_on_palpation",
"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.",
"formula_expression": "INTERCHEST = (age ≥55 if male or ≥65 if female) + physician_suspected_serious + history_of_cad + pain_on_exertion + pressure_quality − pain_reproducible_on_palpation; each ±1; range −1 to 5; CAD considered absent iff score <2 (Aerts 2017); CAD probability 2.1% (95% CI 1.1–3.9) when <2 and 43.0% (35.8–50.4) when ≥2 in the 13.2% prevalence setting",
"cad_probability_percent": 2.1,
"prevalence_setting_percent": 13.2,
"cad_probability_ci_low_percent": 1.1,
"cad_probability_ci_high_percent": 3.9
},
{
"sex": "female",
"score": 0,
"formula": "interchest",
"citation": {
"id": "aerts-2017",
"doi": "10.1016/j.jclinepi.2016.09.011",
"pmid": "27773828",
"title": "Pooled individual patient data from five countries were used to derive a clinical prediction rule for coronary artery disease in primary care",
"source": "J Clin Epidemiol. 2017;81:120-128",
"authors": "Aerts M, Minalu G, Bösner S, Buntinx F, Burnand B, Haasenritter J, Herzig L, Knottnerus JA, Nilsson S, Renier W, Sox C, Sox H, Donner-Banzhoff N, International Working Group on Chest Pain in Primary Care (INTERCHEST)"
},
"age_years": 40,
"max_score": 5,
"min_score": -1,
"cad_absent": true,
"components": [
{
"value": 40,
"factor": "age_sex",
"points": 0,
"present": false
},
{
"factor": "physician_suspected_serious",
"points": 0,
"present": false
},
{
"factor": "history_of_cad",
"points": 0,
"present": false
},
{
"factor": "pain_on_exertion",
"points": 0,
"present": false
},
{
"factor": "pressure_quality",
"points": 0,
"present": false
},
{
"factor": "pain_reproducible_on_palpation",
"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.",
"formula_expression": "INTERCHEST = (age ≥55 if male or ≥65 if female) + physician_suspected_serious + history_of_cad + pain_on_exertion + pressure_quality − pain_reproducible_on_palpation; each ±1; range −1 to 5; CAD considered absent iff score <2 (Aerts 2017); CAD probability 2.1% (95% CI 1.1–3.9) when <2 and 43.0% (35.8–50.4) when ≥2 in the 13.2% prevalence setting",
"cad_probability_percent": 2.1,
"prevalence_setting_percent": 13.2,
"cad_probability_ci_low_percent": 1.1,
"cad_probability_ci_high_percent": 3.9
}
]
}
},
"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",
"physician_suspected_serious",
"history_of_cad",
"pain_on_exertion",
"pressure_quality",
"pain_reproducible_on_palpation"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Combined with sex: female ≥65 or male ≥55 scores 1 (Aerts 2017). Age 54 male does not score; 55 male does. Age 64 female does not; 65 female does. magent computes this; do not send a precomputed flag."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "female or male (required). Combined with age: female ≥65 or male ≥55 scores 1 (Aerts 2017)."
},
"history_of_cad": {
"type": "boolean",
"description": "History of coronary artery disease (Aerts 2017). true or false as assigned by the caller. magent does not take a cardiac history. +1 if true."
},
"pain_on_exertion": {
"type": "boolean",
"description": "Pain related to exertion (Aerts 2017). true or false as assigned by the caller. +1 if true."
},
"pressure_quality": {
"type": "boolean",
"description": "Pain has a pressure quality (Aerts 2017). true or false as assigned by the caller. +1 if true."
},
"physician_suspected_serious": {
"type": "boolean",
"description": "Physician initially suspected a serious diagnosis (Aerts 2017). true or false as assigned by the caller. magent does not examine the chest. +1 if true."
},
"pain_reproducible_on_palpation": {
"type": "boolean",
"description": "Pain reproducible on chest-wall palpation (Aerts 2017). true or false as assigned by the caller. magent does not examine the chest. −1 if true."
}
}
},
"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 13:04Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-13 08:15Z
- 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. 13 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/interchest, 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.