magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
SearchLiveeip155:8453Exactvia cdp
ChalicePediatricHead-ctEmergencyTrauma
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 14 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 13:23Z
—
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/chalice",
"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/chalice",
"tags": [
"chalice",
"pediatric",
"head-ct",
"emergency",
"trauma"
],
"mimeType": "application/json",
"description": "CHALICE (Dunning 2006). CT required in children 0-15 if any history, exam, or mechanism criterion is present; else low risk. GCS <14, or GCS <15 if age <1 year. Bruise/swelling/laceration >5 cm only if age <1 year. Mechanism is caller-assigned (paper: high-speed RTA >40 mph as occupant/pedestrian/cyclist; fall >3 m; high-speed projectile or object). NAI is caller-assigned. Not PECARN, CATCH, or Canadian CT Head. magent does not examine the child. Not a diagnosis or medical device.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 10,
"gcs": 15,
"fall_gt_3m": false,
"vomits_ge_3": false,
"loc_gt_5_min": false,
"suspicion_nai": false,
"high_speed_rta": false,
"focal_neurology": false,
"amnesia_gt_5_min": false,
"abnormal_drowsiness": false,
"seizure_no_epilepsy": false,
"basal_skull_fracture": false,
"high_speed_projectile_or_object": false,
"bruise_swelling_laceration_gt_5cm": false,
"penetrating_depressed_or_tense_fontanelle": false
}
},
"output": {
"type": "json",
"example": {
"gcs": 15,
"formula": "chalice",
"citation": {
"id": "dunning-2006",
"doi": "10.1136/adc.2005.083980",
"pmid": "17056862",
"title": "Derivation of the children's head injury algorithm for the prediction of important clinical events decision rule for head injury in children",
"source": "Arch Dis Child. 2006;91(11):885-891",
"authors": "Dunning J, Daly JP, Lomas JP, Lecky F, Batchelor J, Mackway-Jones K"
},
"criteria": [
{
"met": false,
"factor": "loc_gt_5_min"
},
{
"met": false,
"factor": "amnesia_gt_5_min"
},
{
"met": false,
"factor": "abnormal_drowsiness"
},
{
"met": false,
"factor": "vomits_ge_3"
},
{
"met": false,
"factor": "suspicion_nai"
},
{
"met": false,
"factor": "seizure_no_epilepsy"
},
{
"met": false,
"value": 15,
"factor": "gcs_criterion"
},
{
"met": false,
"factor": "penetrating_depressed_or_tense_fontanelle"
},
{
"met": false,
"factor": "basal_skull_fracture"
},
{
"met": false,
"factor": "focal_neurology"
},
{
"met": false,
"value": 10,
"factor": "bruise_swelling_laceration_gt_5cm"
},
{
"met": false,
"factor": "high_speed_rta"
},
{
"met": false,
"factor": "fall_gt_3m"
},
{
"met": false,
"factor": "high_speed_projectile_or_object"
}
],
"age_years": 10,
"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.",
"chalice_low_risk": true,
"formula_expression": "CT required if any history, examination, or mechanism criterion is present; else low risk. GCS <14, or GCS <15 if age <1 year. Bruise, swelling, or laceration >5 cm only if age <1 year. Mechanism is caller-assigned.",
"chalice_ct_required": 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",
"gcs",
"loc_gt_5_min",
"amnesia_gt_5_min",
"abnormal_drowsiness",
"vomits_ge_3",
"suspicion_nai",
"seizure_no_epilepsy",
"penetrating_depressed_or_tense_fontanelle",
"basal_skull_fracture",
"focal_neurology",
"bruise_swelling_laceration_gt_5cm",
"high_speed_rta",
"fall_gt_3m",
"high_speed_projectile_or_object"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in whole years (0-15). CHALICE is for children younger than 16. Age 0 is younger than 1 year (GCS <15 and bruise >5 cm apply). Age 1-15 uses GCS <14. Age 16 is rejected."
},
"gcs": {
"type": "integer",
"description": "Glasgow Coma Scale total, integer 3-15 as assigned by the caller. Examination criterion: GCS <14, or GCS <15 if age <1 year."
},
"fall_gt_3m": {
"type": "boolean",
"description": "Fall >3 m as assigned by the caller. true or false. Mechanism criterion. magent does not classify mechanism or take a height integer."
},
"vomits_ge_3": {
"type": "boolean",
"description": "Three or more vomits after the head injury. true or false as assigned by the caller. History criterion."
},
"loc_gt_5_min": {
"type": "boolean",
"description": "Witnessed loss of consciousness >5 minutes. true or false as assigned by the caller. History criterion. magent does not take a duration integer."
},
"suspicion_nai": {
"type": "boolean",
"description": "Suspicion of non-accidental injury as assigned by the caller. true or false. History criterion. magent does not diagnose NAI."
},
"high_speed_rta": {
"type": "boolean",
"description": "High-speed road traffic accident as occupant, pedestrian, or cyclist as assigned by the caller (paper: speed >40 mph). true or false. Mechanism criterion. magent does not classify mechanism."
},
"focal_neurology": {
"type": "boolean",
"description": "Positive focal neurology. true or false as assigned by the caller. Examination criterion. magent does not examine the child."
},
"amnesia_gt_5_min": {
"type": "boolean",
"description": "Amnesia (anterograde or retrograde) >5 minutes. true or false as assigned by the caller. History criterion. magent does not take a duration integer."
},
"abnormal_drowsiness": {
"type": "boolean",
"description": "Abnormal drowsiness. true or false as assigned by the caller. History criterion. magent does not examine the child."
},
"seizure_no_epilepsy": {
"type": "boolean",
"description": "Seizure after the head injury in a child with no history of epilepsy. true or false as assigned by the caller. History criterion."
},
"basal_skull_fracture": {
"type": "boolean",
"description": "Signs of basal skull fracture. true or false as assigned by the caller. Examination criterion. magent does not examine the child."
},
"high_speed_projectile_or_object": {
"type": "boolean",
"description": "High-speed injury from a projectile or object as assigned by the caller. true or false. Mechanism criterion. magent does not classify mechanism."
},
"bruise_swelling_laceration_gt_5cm": {
"type": "boolean",
"description": "Bruise, swelling, or laceration >5 cm. true or false as assigned by the caller. Examination criterion that scores only when age <1 year; parsed but not scored when age >= 1. magent does not measure the lesion."
},
"penetrating_depressed_or_tense_fontanelle": {
"type": "boolean",
"description": "Suspicion of penetrating or depressed skull injury or tense fontanelle. true or false as assigned by the caller. Examination criterion. magent does not examine the child."
}
}
}
},
"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/chalice",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 10,
"gcs": 15,
"fall_gt_3m": false,
"vomits_ge_3": false,
"loc_gt_5_min": false,
"suspicion_nai": false,
"high_speed_rta": false,
"focal_neurology": false,
"amnesia_gt_5_min": false,
"abnormal_drowsiness": false,
"seizure_no_epilepsy": false,
"basal_skull_fracture": false,
"high_speed_projectile_or_object": false,
"bruise_swelling_laceration_gt_5cm": false,
"penetrating_depressed_or_tense_fontanelle": false
},
{
"age": 10,
"gcs": 15,
"fall_gt_3m": false,
"vomits_ge_3": false,
"loc_gt_5_min": false,
"suspicion_nai": false,
"high_speed_rta": false,
"focal_neurology": false,
"amnesia_gt_5_min": false,
"abnormal_drowsiness": false,
"seizure_no_epilepsy": false,
"basal_skull_fracture": false,
"high_speed_projectile_or_object": false,
"bruise_swelling_laceration_gt_5cm": false,
"penetrating_depressed_or_tense_fontanelle": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/chalice",
"count": 2,
"items": [
{
"gcs": 15,
"formula": "chalice",
"citation": {
"id": "dunning-2006",
"doi": "10.1136/adc.2005.083980",
"pmid": "17056862",
"title": "Derivation of the children's head injury algorithm for the prediction of important clinical events decision rule for head injury in children",
"source": "Arch Dis Child. 2006;91(11):885-891",
"authors": "Dunning J, Daly JP, Lomas JP, Lecky F, Batchelor J, Mackway-Jones K"
},
"criteria": [
{
"met": false,
"factor": "loc_gt_5_min"
},
{
"met": false,
"factor": "amnesia_gt_5_min"
},
{
"met": false,
"factor": "abnormal_drowsiness"
},
{
"met": false,
"factor": "vomits_ge_3"
},
{
"met": false,
"factor": "suspicion_nai"
},
{
"met": false,
"factor": "seizure_no_epilepsy"
},
{
"met": false,
"value": 15,
"factor": "gcs_criterion"
},
{
"met": false,
"factor": "penetrating_depressed_or_tense_fontanelle"
},
{
"met": false,
"factor": "basal_skull_fracture"
},
{
"met": false,
"factor": "focal_neurology"
},
{
"met": false,
"value": 10,
"factor": "bruise_swelling_laceration_gt_5cm"
},
{
"met": false,
"factor": "high_speed_rta"
},
{
"met": false,
"factor": "fall_gt_3m"
},
{
"met": false,
"factor": "high_speed_projectile_or_object"
}
],
"age_years": 10,
"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.",
"chalice_low_risk": true,
"formula_expression": "CT required if any history, examination, or mechanism criterion is present; else low risk. GCS <14, or GCS <15 if age <1 year. Bruise, swelling, or laceration >5 cm only if age <1 year. Mechanism is caller-assigned.",
"chalice_ct_required": false
},
{
"gcs": 15,
"formula": "chalice",
"citation": {
"id": "dunning-2006",
"doi": "10.1136/adc.2005.083980",
"pmid": "17056862",
"title": "Derivation of the children's head injury algorithm for the prediction of important clinical events decision rule for head injury in children",
"source": "Arch Dis Child. 2006;91(11):885-891",
"authors": "Dunning J, Daly JP, Lomas JP, Lecky F, Batchelor J, Mackway-Jones K"
},
"criteria": [
{
"met": false,
"factor": "loc_gt_5_min"
},
{
"met": false,
"factor": "amnesia_gt_5_min"
},
{
"met": false,
"factor": "abnormal_drowsiness"
},
{
"met": false,
"factor": "vomits_ge_3"
},
{
"met": false,
"factor": "suspicion_nai"
},
{
"met": false,
"factor": "seizure_no_epilepsy"
},
{
"met": false,
"value": 15,
"factor": "gcs_criterion"
},
{
"met": false,
"factor": "penetrating_depressed_or_tense_fontanelle"
},
{
"met": false,
"factor": "basal_skull_fracture"
},
{
"met": false,
"factor": "focal_neurology"
},
{
"met": false,
"value": 10,
"factor": "bruise_swelling_laceration_gt_5cm"
},
{
"met": false,
"factor": "high_speed_rta"
},
{
"met": false,
"factor": "fall_gt_3m"
},
{
"met": false,
"factor": "high_speed_projectile_or_object"
}
],
"age_years": 10,
"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.",
"chalice_low_risk": true,
"formula_expression": "CT required if any history, examination, or mechanism criterion is present; else low risk. GCS <14, or GCS <15 if age <1 year. Bruise, swelling, or laceration >5 cm only if age <1 year. Mechanism is caller-assigned.",
"chalice_ct_required": 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",
"gcs",
"loc_gt_5_min",
"amnesia_gt_5_min",
"abnormal_drowsiness",
"vomits_ge_3",
"suspicion_nai",
"seizure_no_epilepsy",
"penetrating_depressed_or_tense_fontanelle",
"basal_skull_fracture",
"focal_neurology",
"bruise_swelling_laceration_gt_5cm",
"high_speed_rta",
"fall_gt_3m",
"high_speed_projectile_or_object"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in whole years (0-15). CHALICE is for children younger than 16. Age 0 is younger than 1 year (GCS <15 and bruise >5 cm apply). Age 1-15 uses GCS <14. Age 16 is rejected."
},
"gcs": {
"type": "integer",
"description": "Glasgow Coma Scale total, integer 3-15 as assigned by the caller. Examination criterion: GCS <14, or GCS <15 if age <1 year."
},
"fall_gt_3m": {
"type": "boolean",
"description": "Fall >3 m as assigned by the caller. true or false. Mechanism criterion. magent does not classify mechanism or take a height integer."
},
"vomits_ge_3": {
"type": "boolean",
"description": "Three or more vomits after the head injury. true or false as assigned by the caller. History criterion."
},
"loc_gt_5_min": {
"type": "boolean",
"description": "Witnessed loss of consciousness >5 minutes. true or false as assigned by the caller. History criterion. magent does not take a duration integer."
},
"suspicion_nai": {
"type": "boolean",
"description": "Suspicion of non-accidental injury as assigned by the caller. true or false. History criterion. magent does not diagnose NAI."
},
"high_speed_rta": {
"type": "boolean",
"description": "High-speed road traffic accident as occupant, pedestrian, or cyclist as assigned by the caller (paper: speed >40 mph). true or false. Mechanism criterion. magent does not classify mechanism."
},
"focal_neurology": {
"type": "boolean",
"description": "Positive focal neurology. true or false as assigned by the caller. Examination criterion. magent does not examine the child."
},
"amnesia_gt_5_min": {
"type": "boolean",
"description": "Amnesia (anterograde or retrograde) >5 minutes. true or false as assigned by the caller. History criterion. magent does not take a duration integer."
},
"abnormal_drowsiness": {
"type": "boolean",
"description": "Abnormal drowsiness. true or false as assigned by the caller. History criterion. magent does not examine the child."
},
"seizure_no_epilepsy": {
"type": "boolean",
"description": "Seizure after the head injury in a child with no history of epilepsy. true or false as assigned by the caller. History criterion."
},
"basal_skull_fracture": {
"type": "boolean",
"description": "Signs of basal skull fracture. true or false as assigned by the caller. Examination criterion. magent does not examine the child."
},
"high_speed_projectile_or_object": {
"type": "boolean",
"description": "High-speed injury from a projectile or object as assigned by the caller. true or false. Mechanism criterion. magent does not classify mechanism."
},
"bruise_swelling_laceration_gt_5cm": {
"type": "boolean",
"description": "Bruise, swelling, or laceration >5 cm. true or false as assigned by the caller. Examination criterion that scores only when age <1 year; parsed but not scored when age >= 1. magent does not measure the lesion."
},
"penetrating_depressed_or_tense_fontanelle": {
"type": "boolean",
"description": "Suspicion of penetrating or depressed skull injury or tense fontanelle. true or false as assigned by the caller. Examination criterion. magent does not examine the child."
}
}
},
"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 13:23Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 01:15Z
- 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. 14 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/chalice, 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.