magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
SearchLiveeip155:8453Exactvia cdp
Pecarn-headPediatricHead-ctEmergencyCitbi
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 13:22Z
—
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/pecarn_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/pecarn_head",
"tags": [
"pecarn-head",
"pediatric",
"head-ct",
"emergency",
"citbi"
],
"mimeType": "application/json",
"description": "PECARN pediatric head CT (Kuppermann 2009). Two age trees (under 2 vs 2-17). High if any age-applicable high-risk factor (GCS <=14 or altered mental status in both; palpable skull fracture if under 2; signs of basilar skull fracture if 2 or older), else intermediate if any age-applicable intermediate factor, else low. CT recommended only when high. Not a diagnosis. Not Canadian CT Head, CATCH, CHALICE, NEXUS, or PECARN IAI/febrile/c-spine. magent does not examine the patient.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 10,
"gcs_le_14": false,
"history_of_loc": false,
"severe_headache": false,
"loc_ge_5_seconds": false,
"severe_mechanism": false,
"history_of_vomiting": false,
"not_acting_normally": false,
"altered_mental_status": false,
"palpable_skull_fracture": false,
"nonfrontal_scalp_hematoma": false,
"signs_basilar_skull_fracture": false
}
},
"output": {
"type": "json",
"example": {
"formula": "pecarn_head",
"age_band": "ge_2",
"citation": {
"id": "kuppermann-2009",
"doi": "10.1016/S0140-6736(09)61558-0",
"title": "Identification of children at very low risk of clinically-important brain injuries after head trauma: a prospective cohort study",
"source": "Lancet. 2009;374(9696):1160-1170",
"authors": "Kuppermann N, Holmes JF, Dayan PS, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_le_14"
},
{
"met": false,
"factor": "altered_mental_status"
},
{
"met": false,
"factor": "signs_basilar_skull_fracture"
},
{
"met": false,
"factor": "history_of_loc"
},
{
"met": false,
"factor": "history_of_vomiting"
},
{
"met": false,
"factor": "severe_headache"
},
{
"met": false,
"factor": "severe_mechanism"
}
],
"age_years": 10,
"risk_tier": "low",
"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.",
"ct_recommended": false,
"observation_vs_ct": false,
"ct_not_recommended": true,
"formula_expression": "high if any age-applicable high-risk factor, else intermediate if any age-applicable intermediate factor, else low; lt_2 tree if age < 2, ge_2 tree if age 2-17"
}
},
"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_le_14",
"altered_mental_status",
"palpable_skull_fracture",
"signs_basilar_skull_fracture",
"nonfrontal_scalp_hematoma",
"loc_ge_5_seconds",
"not_acting_normally",
"history_of_loc",
"history_of_vomiting",
"severe_headache",
"severe_mechanism"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (0-17). Age 0 and 1 use the lt_2 tree; age 2 through 17 use the ge_2 tree. Age 18 is rejected."
},
"gcs_le_14": {
"type": "boolean",
"description": "GCS <=14 as assigned by the caller. true or false. High-risk in both trees. GCS 15 is not <=14. magent does not take a GCS integer."
},
"history_of_loc": {
"type": "boolean",
"description": "History of loss of consciousness as assigned by the caller. true or false. Intermediate only on the ge_2 tree; parsed but not scored when age < 2."
},
"severe_headache": {
"type": "boolean",
"description": "Severe headache as assigned by the caller. true or false. Intermediate only on the ge_2 tree; parsed but not scored when age < 2."
},
"loc_ge_5_seconds": {
"type": "boolean",
"description": "Loss of consciousness >=5 seconds as assigned by the caller. true or false. Intermediate only on the lt_2 tree; parsed but not scored when age >= 2."
},
"severe_mechanism": {
"type": "boolean",
"description": "Severe mechanism as assigned by the caller. true or false. Intermediate in both trees. Paper list: MVC ejection/rollover/death of another passenger; unhelmeted pedestrian or bicyclist struck by a motorized vehicle; fall >3 ft if <2 years or >5 ft if >=2 years; head struck by a high-impact object. magent does not classify mechanism or take fall height."
},
"history_of_vomiting": {
"type": "boolean",
"description": "History of vomiting as assigned by the caller. true or false. Intermediate only on the ge_2 tree; parsed but not scored when age < 2."
},
"not_acting_normally": {
"type": "boolean",
"description": "Not acting normally per parent report as assigned by the caller. true or false. Intermediate only on the lt_2 tree; parsed but not scored when age >= 2."
},
"altered_mental_status": {
"type": "boolean",
"description": "Altered mental status as assigned by the caller (paper: agitation, somnolence, repetitive questioning, or slow response). true or false. High-risk in both trees."
},
"palpable_skull_fracture": {
"type": "boolean",
"description": "Palpable skull fracture as assigned by the caller. true or false. High-risk only on the lt_2 tree; parsed but not scored when age >= 2."
},
"nonfrontal_scalp_hematoma": {
"type": "boolean",
"description": "Occipital, parietal, or temporal scalp hematoma (not frontal) as assigned by the caller. true or false. Intermediate only on the lt_2 tree; parsed but not scored when age >= 2."
},
"signs_basilar_skull_fracture": {
"type": "boolean",
"description": "Signs of basilar skull fracture as assigned by the caller. true or false. High-risk only on the ge_2 tree; parsed but not scored when age < 2."
}
}
}
},
"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/pecarn_head",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 10,
"gcs_le_14": false,
"history_of_loc": false,
"severe_headache": false,
"loc_ge_5_seconds": false,
"severe_mechanism": false,
"history_of_vomiting": false,
"not_acting_normally": false,
"altered_mental_status": false,
"palpable_skull_fracture": false,
"nonfrontal_scalp_hematoma": false,
"signs_basilar_skull_fracture": false
},
{
"age": 10,
"gcs_le_14": false,
"history_of_loc": false,
"severe_headache": false,
"loc_ge_5_seconds": false,
"severe_mechanism": false,
"history_of_vomiting": false,
"not_acting_normally": false,
"altered_mental_status": false,
"palpable_skull_fracture": false,
"nonfrontal_scalp_hematoma": false,
"signs_basilar_skull_fracture": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/pecarn_head",
"count": 2,
"items": [
{
"formula": "pecarn_head",
"age_band": "ge_2",
"citation": {
"id": "kuppermann-2009",
"doi": "10.1016/S0140-6736(09)61558-0",
"title": "Identification of children at very low risk of clinically-important brain injuries after head trauma: a prospective cohort study",
"source": "Lancet. 2009;374(9696):1160-1170",
"authors": "Kuppermann N, Holmes JF, Dayan PS, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_le_14"
},
{
"met": false,
"factor": "altered_mental_status"
},
{
"met": false,
"factor": "signs_basilar_skull_fracture"
},
{
"met": false,
"factor": "history_of_loc"
},
{
"met": false,
"factor": "history_of_vomiting"
},
{
"met": false,
"factor": "severe_headache"
},
{
"met": false,
"factor": "severe_mechanism"
}
],
"age_years": 10,
"risk_tier": "low",
"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.",
"ct_recommended": false,
"observation_vs_ct": false,
"ct_not_recommended": true,
"formula_expression": "high if any age-applicable high-risk factor, else intermediate if any age-applicable intermediate factor, else low; lt_2 tree if age < 2, ge_2 tree if age 2-17"
},
{
"formula": "pecarn_head",
"age_band": "ge_2",
"citation": {
"id": "kuppermann-2009",
"doi": "10.1016/S0140-6736(09)61558-0",
"title": "Identification of children at very low risk of clinically-important brain injuries after head trauma: a prospective cohort study",
"source": "Lancet. 2009;374(9696):1160-1170",
"authors": "Kuppermann N, Holmes JF, Dayan PS, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_le_14"
},
{
"met": false,
"factor": "altered_mental_status"
},
{
"met": false,
"factor": "signs_basilar_skull_fracture"
},
{
"met": false,
"factor": "history_of_loc"
},
{
"met": false,
"factor": "history_of_vomiting"
},
{
"met": false,
"factor": "severe_headache"
},
{
"met": false,
"factor": "severe_mechanism"
}
],
"age_years": 10,
"risk_tier": "low",
"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.",
"ct_recommended": false,
"observation_vs_ct": false,
"ct_not_recommended": true,
"formula_expression": "high if any age-applicable high-risk factor, else intermediate if any age-applicable intermediate factor, else low; lt_2 tree if age < 2, ge_2 tree if age 2-17"
}
]
}
},
"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_le_14",
"altered_mental_status",
"palpable_skull_fracture",
"signs_basilar_skull_fracture",
"nonfrontal_scalp_hematoma",
"loc_ge_5_seconds",
"not_acting_normally",
"history_of_loc",
"history_of_vomiting",
"severe_headache",
"severe_mechanism"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (0-17). Age 0 and 1 use the lt_2 tree; age 2 through 17 use the ge_2 tree. Age 18 is rejected."
},
"gcs_le_14": {
"type": "boolean",
"description": "GCS <=14 as assigned by the caller. true or false. High-risk in both trees. GCS 15 is not <=14. magent does not take a GCS integer."
},
"history_of_loc": {
"type": "boolean",
"description": "History of loss of consciousness as assigned by the caller. true or false. Intermediate only on the ge_2 tree; parsed but not scored when age < 2."
},
"severe_headache": {
"type": "boolean",
"description": "Severe headache as assigned by the caller. true or false. Intermediate only on the ge_2 tree; parsed but not scored when age < 2."
},
"loc_ge_5_seconds": {
"type": "boolean",
"description": "Loss of consciousness >=5 seconds as assigned by the caller. true or false. Intermediate only on the lt_2 tree; parsed but not scored when age >= 2."
},
"severe_mechanism": {
"type": "boolean",
"description": "Severe mechanism as assigned by the caller. true or false. Intermediate in both trees. Paper list: MVC ejection/rollover/death of another passenger; unhelmeted pedestrian or bicyclist struck by a motorized vehicle; fall >3 ft if <2 years or >5 ft if >=2 years; head struck by a high-impact object. magent does not classify mechanism or take fall height."
},
"history_of_vomiting": {
"type": "boolean",
"description": "History of vomiting as assigned by the caller. true or false. Intermediate only on the ge_2 tree; parsed but not scored when age < 2."
},
"not_acting_normally": {
"type": "boolean",
"description": "Not acting normally per parent report as assigned by the caller. true or false. Intermediate only on the lt_2 tree; parsed but not scored when age >= 2."
},
"altered_mental_status": {
"type": "boolean",
"description": "Altered mental status as assigned by the caller (paper: agitation, somnolence, repetitive questioning, or slow response). true or false. High-risk in both trees."
},
"palpable_skull_fracture": {
"type": "boolean",
"description": "Palpable skull fracture as assigned by the caller. true or false. High-risk only on the lt_2 tree; parsed but not scored when age >= 2."
},
"nonfrontal_scalp_hematoma": {
"type": "boolean",
"description": "Occipital, parietal, or temporal scalp hematoma (not frontal) as assigned by the caller. true or false. Intermediate only on the lt_2 tree; parsed but not scored when age >= 2."
},
"signs_basilar_skull_fracture": {
"type": "boolean",
"description": "Signs of basilar skull fracture as assigned by the caller. true or false. High-risk only on the ge_2 tree; parsed but not scored when age < 2."
}
}
},
"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 13:22Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 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. 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/pecarn_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.