magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
TradingLiveeip155:8453Exactvia cdp
Vancouver-chest-painAcsChest-painTroponinCalculator
Calls · 30d
1→ 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.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-31 13:02Z
—
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/vancouver_chest_pain",
"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/vancouver_chest_pain",
"tags": [
"vancouver-chest-pain",
"acs",
"chest-pain",
"troponin",
"calculator"
],
"mimeType": "application/json",
"description": "Christenson 2006 Vancouver Chest Pain Rule. early_discharge_eligible is true when the initial ECG is not abnormal, 2-hour troponin is not elevated, there is no prior ACS or nitrate use, and either palpation reproduces pain or age is under 40 without radiation to neck, arm, or jaw. Age 40 is not the age-history path. magent does not interpret ECGs or assay troponin. Not the 2014 age-50 variant. Not a medical device and not a discharge order.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 35,
"abnormal_initial_ecg": false,
"prior_acs_or_nitrate": false,
"troponin_2h_elevated": false,
"palpation_reproduces_pain": false,
"pain_radiates_neck_jaw_arm": false
}
},
"output": {
"type": "json",
"example": {
"formula": "vancouver_chest_pain",
"citation": {
"id": "christenson-2006",
"doi": "10.1016/j.annemergmed.2005.08.007",
"pmid": "16387209",
"title": "A clinical prediction rule for early discharge of patients with chest pain",
"source": "Ann Emerg Med. 2006;47(1):1-10",
"authors": "Christenson J, Innes G, McKnight D, et al."
},
"criteria": [
{
"met": true,
"value": false,
"factor": "normal_initial_ecg"
},
{
"met": true,
"value": false,
"factor": "troponin_2h_not_elevated"
},
{
"met": true,
"value": false,
"factor": "no_prior_acs_or_nitrate"
},
{
"met": true,
"value": 35,
"factor": "palpation_or_age_history"
}
],
"age_years": 35,
"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": "early_discharge_eligible iff not abnormal_initial_ecg and not troponin_2h_elevated and not prior_acs_or_nitrate and (palpation_reproduces_pain or (age < 40 and not pain_radiates_neck_jaw_arm)); age 40 is not the age-history path (Christenson 2006 derivation tree; not Cullen 2014 / Scheuermeyer 2014 age 50)",
"abnormal_initial_ecg": false,
"prior_acs_or_nitrate": false,
"troponin_2h_elevated": false,
"early_discharge_eligible": true,
"palpation_reproduces_pain": false,
"pain_radiates_neck_jaw_arm": false
}
},
"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",
"abnormal_initial_ecg",
"troponin_2h_elevated",
"prior_acs_or_nitrate",
"palpation_reproduces_pain",
"pain_radiates_neck_jaw_arm"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 18-120). The 2006 age-history path requires age under 40 when palpation does not reproduce pain. Age 40 is not that path (Christenson 2006; not the later age-50 cutoff)."
},
"abnormal_initial_ecg": {
"type": "boolean",
"description": "Caller-assigned abnormal initial ECG as used in Christenson 2006 (true blocks early discharge). T-wave flattening was the only acceptable ST-T abnormality in that paper. true or false. magent does not interpret an ECG."
},
"prior_acs_or_nitrate": {
"type": "boolean",
"description": "Prior ACS (MI or angina) or nitrate use as assigned by the caller (Christenson 2006 prior ischemic chest pain / nitroglycerin node). true or false. true blocks early discharge."
},
"troponin_2h_elevated": {
"type": "boolean",
"description": "Caller-assigned 2-hour troponin at or above the institutional cutoff. true or false. true blocks early discharge. magent does not assay troponin or CK-MB."
},
"palpation_reproduces_pain": {
"type": "boolean",
"description": "Chest pain reproduced by palpation as assigned by the caller. true or false. When ECG, 2-hour troponin, and prior ACS/nitrate are clear, true is early-discharge eligible regardless of age or radiation. magent does not palpate the chest."
},
"pain_radiates_neck_jaw_arm": {
"type": "boolean",
"description": "Pain radiates to neck, arm, or jaw as assigned by the caller (Christenson 2006). true or false. On the age-history path (palpation false), true blocks early discharge. magent does not take a pain history."
}
}
}
},
"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/vancouver_chest_pain",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 35,
"abnormal_initial_ecg": false,
"prior_acs_or_nitrate": false,
"troponin_2h_elevated": false,
"palpation_reproduces_pain": false,
"pain_radiates_neck_jaw_arm": false
},
{
"age": 35,
"abnormal_initial_ecg": false,
"prior_acs_or_nitrate": false,
"troponin_2h_elevated": false,
"palpation_reproduces_pain": false,
"pain_radiates_neck_jaw_arm": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/vancouver_chest_pain",
"count": 2,
"items": [
{
"formula": "vancouver_chest_pain",
"citation": {
"id": "christenson-2006",
"doi": "10.1016/j.annemergmed.2005.08.007",
"pmid": "16387209",
"title": "A clinical prediction rule for early discharge of patients with chest pain",
"source": "Ann Emerg Med. 2006;47(1):1-10",
"authors": "Christenson J, Innes G, McKnight D, et al."
},
"criteria": [
{
"met": true,
"value": false,
"factor": "normal_initial_ecg"
},
{
"met": true,
"value": false,
"factor": "troponin_2h_not_elevated"
},
{
"met": true,
"value": false,
"factor": "no_prior_acs_or_nitrate"
},
{
"met": true,
"value": 35,
"factor": "palpation_or_age_history"
}
],
"age_years": 35,
"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": "early_discharge_eligible iff not abnormal_initial_ecg and not troponin_2h_elevated and not prior_acs_or_nitrate and (palpation_reproduces_pain or (age < 40 and not pain_radiates_neck_jaw_arm)); age 40 is not the age-history path (Christenson 2006 derivation tree; not Cullen 2014 / Scheuermeyer 2014 age 50)",
"abnormal_initial_ecg": false,
"prior_acs_or_nitrate": false,
"troponin_2h_elevated": false,
"early_discharge_eligible": true,
"palpation_reproduces_pain": false,
"pain_radiates_neck_jaw_arm": false
},
{
"formula": "vancouver_chest_pain",
"citation": {
"id": "christenson-2006",
"doi": "10.1016/j.annemergmed.2005.08.007",
"pmid": "16387209",
"title": "A clinical prediction rule for early discharge of patients with chest pain",
"source": "Ann Emerg Med. 2006;47(1):1-10",
"authors": "Christenson J, Innes G, McKnight D, et al."
},
"criteria": [
{
"met": true,
"value": false,
"factor": "normal_initial_ecg"
},
{
"met": true,
"value": false,
"factor": "troponin_2h_not_elevated"
},
{
"met": true,
"value": false,
"factor": "no_prior_acs_or_nitrate"
},
{
"met": true,
"value": 35,
"factor": "palpation_or_age_history"
}
],
"age_years": 35,
"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": "early_discharge_eligible iff not abnormal_initial_ecg and not troponin_2h_elevated and not prior_acs_or_nitrate and (palpation_reproduces_pain or (age < 40 and not pain_radiates_neck_jaw_arm)); age 40 is not the age-history path (Christenson 2006 derivation tree; not Cullen 2014 / Scheuermeyer 2014 age 50)",
"abnormal_initial_ecg": false,
"prior_acs_or_nitrate": false,
"troponin_2h_elevated": false,
"early_discharge_eligible": true,
"palpation_reproduces_pain": false,
"pain_radiates_neck_jaw_arm": false
}
]
}
},
"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",
"abnormal_initial_ecg",
"troponin_2h_elevated",
"prior_acs_or_nitrate",
"palpation_reproduces_pain",
"pain_radiates_neck_jaw_arm"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 18-120). The 2006 age-history path requires age under 40 when palpation does not reproduce pain. Age 40 is not that path (Christenson 2006; not the later age-50 cutoff)."
},
"abnormal_initial_ecg": {
"type": "boolean",
"description": "Caller-assigned abnormal initial ECG as used in Christenson 2006 (true blocks early discharge). T-wave flattening was the only acceptable ST-T abnormality in that paper. true or false. magent does not interpret an ECG."
},
"prior_acs_or_nitrate": {
"type": "boolean",
"description": "Prior ACS (MI or angina) or nitrate use as assigned by the caller (Christenson 2006 prior ischemic chest pain / nitroglycerin node). true or false. true blocks early discharge."
},
"troponin_2h_elevated": {
"type": "boolean",
"description": "Caller-assigned 2-hour troponin at or above the institutional cutoff. true or false. true blocks early discharge. magent does not assay troponin or CK-MB."
},
"palpation_reproduces_pain": {
"type": "boolean",
"description": "Chest pain reproduced by palpation as assigned by the caller. true or false. When ECG, 2-hour troponin, and prior ACS/nitrate are clear, true is early-discharge eligible regardless of age or radiation. magent does not palpate the chest."
},
"pain_radiates_neck_jaw_arm": {
"type": "boolean",
"description": "Pain radiates to neck, arm, or jaw as assigned by the caller (Christenson 2006). true or false. On the age-history path (palpation false), true blocks early discharge. magent does not take a pain history."
}
}
},
"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 13:02Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-22 14:45Z
- 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. 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/vancouver_chest_pain, 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.