magent
Canadian CT Head Rule (Stiell 2001). CT is indicated if any high-risk factor (GCS <15 at 2 hours, suspected open or depressed skull fracture, any sign of basal skull fracture, vomiting 2 or more times, or age 65 or older) or any medium-risk factor (amnesia before impact >30 min, or dangerous mechanism as assigned by the caller). Not a diagnosis, not NEXUS, not PECARN, not CATCH, and not pediatric. magent does not examine the patient.
Searchofflineeip155:8453Exactvia cdp
Canadian-ct-headHead-ctEmergencyTraumaCibi
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 15 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 13:21Z
—
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/canadian_ct_head",
"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/canadian_ct_head",
"tags": [
"canadian-ct-head",
"head-ct",
"emergency",
"trauma",
"cibi"
],
"mimeType": "application/json",
"description": "Canadian CT Head Rule (Stiell 2001). CT is indicated if any high-risk factor (GCS <15 at 2 hours, suspected open or depressed skull fracture, any sign of basal skull fracture, vomiting 2 or more times, or age 65 or older) or any medium-risk factor (amnesia before impact >30 min, or dangerous mechanism as assigned by the caller). Not a diagnosis, not NEXUS, not PECARN, not CATCH, and not pediatric. magent does not examine the patient.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 40,
"gcs_lt_15_at_2h": false,
"dangerous_mechanism": false,
"vomiting_two_or_more": false,
"any_sign_basal_skull_fx": false,
"amnesia_before_impact_gt_30min": false,
"suspected_open_or_depressed_skull_fx": false
}
},
"output": {
"type": "json",
"example": {
"formula": "canadian_ct_head",
"citation": {
"id": "stiell-2001-ct-head",
"doi": "10.1016/S0140-6736(00)04561-X",
"title": "The Canadian CT Head Rule for patients with minor head injury",
"source": "Lancet. 2001;357(9266):1391-1396",
"authors": "Stiell IG, Wells GA, Vandemheen K, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_lt_15_at_2h"
},
{
"met": false,
"factor": "suspected_open_or_depressed_skull_fx"
},
{
"met": false,
"factor": "any_sign_basal_skull_fx"
},
{
"met": false,
"factor": "vomiting_two_or_more"
},
{
"met": false,
"value": 40,
"factor": "age_ge_65"
},
{
"met": false,
"factor": "amnesia_before_impact_gt_30min"
},
{
"met": false,
"factor": "dangerous_mechanism"
}
],
"age_years": 40,
"high_risk": 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.",
"medium_risk": false,
"ct_indicated": false,
"formula_expression": "ct indicated if any high-risk (gcs_lt_15_at_2h or suspected_open_or_depressed_skull_fx or any_sign_basal_skull_fx or vomiting_two_or_more or age >= 65) or any medium-risk (amnesia_before_impact_gt_30min or dangerous_mechanism)"
}
},
"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",
"gcs_lt_15_at_2h",
"suspected_open_or_depressed_skull_fx",
"any_sign_basal_skull_fx",
"vomiting_two_or_more",
"amnesia_before_impact_gt_30min",
"dangerous_mechanism"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (16-120). Age ≥65 is a high-risk factor that indicates CT; 64 does not. The published rule is for patients ≥16 years."
},
"gcs_lt_15_at_2h": {
"type": "boolean",
"description": "GCS <15 at 2 hours after injury. true or false as assigned by the caller. High-risk. magent does not take a GCS integer."
},
"dangerous_mechanism": {
"type": "boolean",
"description": "Dangerous mechanism as assigned by the caller. true or false. Medium-risk. Published list: pedestrian struck by a motor vehicle, occupant ejected from a motor vehicle, fall from elevation >3 feet or 5 stairs. magent does not classify mechanism."
},
"vomiting_two_or_more": {
"type": "boolean",
"description": "Two or more episodes of vomiting. true or false as assigned by the caller. High-risk."
},
"any_sign_basal_skull_fx": {
"type": "boolean",
"description": "Any sign of basal skull fracture (hemotympanum, raccoon eyes, CSF otorrhea/rhinorrhea, or Battle's sign). true or false as assigned by the caller. High-risk."
},
"amnesia_before_impact_gt_30min": {
"type": "boolean",
"description": "Amnesia before impact of more than 30 minutes. true or false as assigned by the caller. Medium-risk."
},
"suspected_open_or_depressed_skull_fx": {
"type": "boolean",
"description": "Suspected open or depressed skull fracture. true or false as assigned by the caller. High-risk."
}
}
}
},
"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/canadian_ct_head",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 40,
"gcs_lt_15_at_2h": false,
"dangerous_mechanism": false,
"vomiting_two_or_more": false,
"any_sign_basal_skull_fx": false,
"amnesia_before_impact_gt_30min": false,
"suspected_open_or_depressed_skull_fx": false
},
{
"age": 40,
"gcs_lt_15_at_2h": false,
"dangerous_mechanism": false,
"vomiting_two_or_more": false,
"any_sign_basal_skull_fx": false,
"amnesia_before_impact_gt_30min": false,
"suspected_open_or_depressed_skull_fx": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/canadian_ct_head",
"count": 2,
"items": [
{
"formula": "canadian_ct_head",
"citation": {
"id": "stiell-2001-ct-head",
"doi": "10.1016/S0140-6736(00)04561-X",
"title": "The Canadian CT Head Rule for patients with minor head injury",
"source": "Lancet. 2001;357(9266):1391-1396",
"authors": "Stiell IG, Wells GA, Vandemheen K, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_lt_15_at_2h"
},
{
"met": false,
"factor": "suspected_open_or_depressed_skull_fx"
},
{
"met": false,
"factor": "any_sign_basal_skull_fx"
},
{
"met": false,
"factor": "vomiting_two_or_more"
},
{
"met": false,
"value": 40,
"factor": "age_ge_65"
},
{
"met": false,
"factor": "amnesia_before_impact_gt_30min"
},
{
"met": false,
"factor": "dangerous_mechanism"
}
],
"age_years": 40,
"high_risk": 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.",
"medium_risk": false,
"ct_indicated": false,
"formula_expression": "ct indicated if any high-risk (gcs_lt_15_at_2h or suspected_open_or_depressed_skull_fx or any_sign_basal_skull_fx or vomiting_two_or_more or age >= 65) or any medium-risk (amnesia_before_impact_gt_30min or dangerous_mechanism)"
},
{
"formula": "canadian_ct_head",
"citation": {
"id": "stiell-2001-ct-head",
"doi": "10.1016/S0140-6736(00)04561-X",
"title": "The Canadian CT Head Rule for patients with minor head injury",
"source": "Lancet. 2001;357(9266):1391-1396",
"authors": "Stiell IG, Wells GA, Vandemheen K, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_lt_15_at_2h"
},
{
"met": false,
"factor": "suspected_open_or_depressed_skull_fx"
},
{
"met": false,
"factor": "any_sign_basal_skull_fx"
},
{
"met": false,
"factor": "vomiting_two_or_more"
},
{
"met": false,
"value": 40,
"factor": "age_ge_65"
},
{
"met": false,
"factor": "amnesia_before_impact_gt_30min"
},
{
"met": false,
"factor": "dangerous_mechanism"
}
],
"age_years": 40,
"high_risk": 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.",
"medium_risk": false,
"ct_indicated": false,
"formula_expression": "ct indicated if any high-risk (gcs_lt_15_at_2h or suspected_open_or_depressed_skull_fx or any_sign_basal_skull_fx or vomiting_two_or_more or age >= 65) or any medium-risk (amnesia_before_impact_gt_30min or dangerous_mechanism)"
}
]
}
},
"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",
"gcs_lt_15_at_2h",
"suspected_open_or_depressed_skull_fx",
"any_sign_basal_skull_fx",
"vomiting_two_or_more",
"amnesia_before_impact_gt_30min",
"dangerous_mechanism"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (16-120). Age ≥65 is a high-risk factor that indicates CT; 64 does not. The published rule is for patients ≥16 years."
},
"gcs_lt_15_at_2h": {
"type": "boolean",
"description": "GCS <15 at 2 hours after injury. true or false as assigned by the caller. High-risk. magent does not take a GCS integer."
},
"dangerous_mechanism": {
"type": "boolean",
"description": "Dangerous mechanism as assigned by the caller. true or false. Medium-risk. Published list: pedestrian struck by a motor vehicle, occupant ejected from a motor vehicle, fall from elevation >3 feet or 5 stairs. magent does not classify mechanism."
},
"vomiting_two_or_more": {
"type": "boolean",
"description": "Two or more episodes of vomiting. true or false as assigned by the caller. High-risk."
},
"any_sign_basal_skull_fx": {
"type": "boolean",
"description": "Any sign of basal skull fracture (hemotympanum, raccoon eyes, CSF otorrhea/rhinorrhea, or Battle's sign). true or false as assigned by the caller. High-risk."
},
"amnesia_before_impact_gt_30min": {
"type": "boolean",
"description": "Amnesia before impact of more than 30 minutes. true or false as assigned by the caller. Medium-risk."
},
"suspected_open_or_depressed_skull_fx": {
"type": "boolean",
"description": "Suspected open or depressed skull fracture. true or false as assigned by the caller. High-risk."
}
}
},
"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 13:21Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-10 06:45Z
- 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. 15 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/canadian_ct_head, 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.