magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
SearchLiveeip155:8453Exactvia cdp
Nexus-chestChest-xrayTraumaEmergencyCalculator
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 13:20Z
—
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/nexus_chest",
"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/nexus_chest",
"tags": [
"nexus-chest",
"chest-xray",
"trauma",
"emergency",
"calculator"
],
"mimeType": "application/json",
"description": "NEXUS Chest (Rodriguez 2011). Chest radiography is not indicated by this instrument only when all seven caller-assigned findings are absent: chest pain, distracting injury, chest-wall tenderness, intoxication, age >60, rapid deceleration, and altered mental status. Any one present means chest x-ray is indicated. Not a diagnosis, not Hoffman 2000 NEXUS C-spine, and not a NEXUS Chest CT instrument. Derivation enrolled blunt trauma age >14. magent does not examine the patient.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age_gt_60": false,
"chest_pain": false,
"intoxication": false,
"distracting_injury": false,
"rapid_deceleration": false,
"altered_mental_status": false,
"chest_wall_tenderness": false
}
},
"output": {
"type": "json",
"example": {
"formula": "nexus_chest",
"citation": {
"id": "rodriguez-2011",
"doi": "10.1097/TA.0b013e3181f2ac9d",
"pmid": "21045745",
"title": "Derivation of a decision instrument for selective chest radiography in blunt trauma",
"source": "J Trauma. 2011;71(3):549-553",
"authors": "Rodriguez RM, Hendey GW, Mower W, et al."
},
"criteria": [
{
"met": true,
"factor": "no_chest_pain"
},
{
"met": true,
"factor": "no_distracting_injury"
},
{
"met": true,
"factor": "no_chest_wall_tenderness"
},
{
"met": true,
"factor": "no_intoxication"
},
{
"met": true,
"factor": "no_age_gt_60"
},
{
"met": true,
"factor": "no_rapid_deceleration"
},
{
"met": true,
"factor": "no_altered_mental_status"
}
],
"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": "NEXUS Chest low-risk iff no chest pain and no distracting injury and no chest-wall tenderness and no intoxication and age not >60 and no rapid deceleration and no altered mental status",
"chest_xray_indicated": false,
"nexus_chest_low_risk": true
}
},
"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": [
"chest_pain",
"distracting_injury",
"chest_wall_tenderness",
"intoxication",
"age_gt_60",
"rapid_deceleration",
"altered_mental_status"
],
"properties": {
"age_gt_60": {
"type": "boolean",
"description": "Age greater than 60 years as assigned by the caller (a NEXUS Chest criterion, not a numeric age input). true means age >60 and the low-risk criterion fails. true or false. magent does not take numeric age."
},
"chest_pain": {
"type": "boolean",
"description": "Chest pain. true means chest pain is present and the low-risk criterion fails. true or false as assigned by the caller. magent does not examine the patient."
},
"intoxication": {
"type": "boolean",
"description": "Intoxication. true means intoxicated and the low-risk criterion fails. true or false as assigned by the caller."
},
"distracting_injury": {
"type": "boolean",
"description": "Painful, distracting injury. true means a distracting injury is present and the low-risk criterion fails. true or false as assigned by the caller."
},
"rapid_deceleration": {
"type": "boolean",
"description": "Rapid deceleration mechanism (paper: fall from >20 feet or motor vehicle crash >40 mph) as assigned by the caller. true means the mechanism is present and the low-risk criterion fails. true or false. magent does not classify mechanism."
},
"altered_mental_status": {
"type": "boolean",
"description": "Altered alertness or mental status. true means altered mental status is present and the low-risk criterion fails. true or false as assigned by the caller. magent does not examine the patient."
},
"chest_wall_tenderness": {
"type": "boolean",
"description": "Tenderness to chest-wall palpation. true means tenderness is present and the low-risk criterion fails. true or false as assigned by the caller. magent does not palpate the chest."
}
}
}
},
"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/nexus_chest",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age_gt_60": false,
"chest_pain": false,
"intoxication": false,
"distracting_injury": false,
"rapid_deceleration": false,
"altered_mental_status": false,
"chest_wall_tenderness": false
},
{
"age_gt_60": false,
"chest_pain": false,
"intoxication": false,
"distracting_injury": false,
"rapid_deceleration": false,
"altered_mental_status": false,
"chest_wall_tenderness": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/nexus_chest",
"count": 2,
"items": [
{
"formula": "nexus_chest",
"citation": {
"id": "rodriguez-2011",
"doi": "10.1097/TA.0b013e3181f2ac9d",
"pmid": "21045745",
"title": "Derivation of a decision instrument for selective chest radiography in blunt trauma",
"source": "J Trauma. 2011;71(3):549-553",
"authors": "Rodriguez RM, Hendey GW, Mower W, et al."
},
"criteria": [
{
"met": true,
"factor": "no_chest_pain"
},
{
"met": true,
"factor": "no_distracting_injury"
},
{
"met": true,
"factor": "no_chest_wall_tenderness"
},
{
"met": true,
"factor": "no_intoxication"
},
{
"met": true,
"factor": "no_age_gt_60"
},
{
"met": true,
"factor": "no_rapid_deceleration"
},
{
"met": true,
"factor": "no_altered_mental_status"
}
],
"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": "NEXUS Chest low-risk iff no chest pain and no distracting injury and no chest-wall tenderness and no intoxication and age not >60 and no rapid deceleration and no altered mental status",
"chest_xray_indicated": false,
"nexus_chest_low_risk": true
},
{
"formula": "nexus_chest",
"citation": {
"id": "rodriguez-2011",
"doi": "10.1097/TA.0b013e3181f2ac9d",
"pmid": "21045745",
"title": "Derivation of a decision instrument for selective chest radiography in blunt trauma",
"source": "J Trauma. 2011;71(3):549-553",
"authors": "Rodriguez RM, Hendey GW, Mower W, et al."
},
"criteria": [
{
"met": true,
"factor": "no_chest_pain"
},
{
"met": true,
"factor": "no_distracting_injury"
},
{
"met": true,
"factor": "no_chest_wall_tenderness"
},
{
"met": true,
"factor": "no_intoxication"
},
{
"met": true,
"factor": "no_age_gt_60"
},
{
"met": true,
"factor": "no_rapid_deceleration"
},
{
"met": true,
"factor": "no_altered_mental_status"
}
],
"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": "NEXUS Chest low-risk iff no chest pain and no distracting injury and no chest-wall tenderness and no intoxication and age not >60 and no rapid deceleration and no altered mental status",
"chest_xray_indicated": false,
"nexus_chest_low_risk": true
}
]
}
},
"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": [
"chest_pain",
"distracting_injury",
"chest_wall_tenderness",
"intoxication",
"age_gt_60",
"rapid_deceleration",
"altered_mental_status"
],
"properties": {
"age_gt_60": {
"type": "boolean",
"description": "Age greater than 60 years as assigned by the caller (a NEXUS Chest criterion, not a numeric age input). true means age >60 and the low-risk criterion fails. true or false. magent does not take numeric age."
},
"chest_pain": {
"type": "boolean",
"description": "Chest pain. true means chest pain is present and the low-risk criterion fails. true or false as assigned by the caller. magent does not examine the patient."
},
"intoxication": {
"type": "boolean",
"description": "Intoxication. true means intoxicated and the low-risk criterion fails. true or false as assigned by the caller."
},
"distracting_injury": {
"type": "boolean",
"description": "Painful, distracting injury. true means a distracting injury is present and the low-risk criterion fails. true or false as assigned by the caller."
},
"rapid_deceleration": {
"type": "boolean",
"description": "Rapid deceleration mechanism (paper: fall from >20 feet or motor vehicle crash >40 mph) as assigned by the caller. true means the mechanism is present and the low-risk criterion fails. true or false. magent does not classify mechanism."
},
"altered_mental_status": {
"type": "boolean",
"description": "Altered alertness or mental status. true means altered mental status is present and the low-risk criterion fails. true or false as assigned by the caller. magent does not examine the patient."
},
"chest_wall_tenderness": {
"type": "boolean",
"description": "Tenderness to chest-wall palpation. true means tenderness is present and the low-risk criterion fails. true or false as assigned by the caller. magent does not palpate the chest."
}
}
},
"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 13:20Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 00:15Z
- 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/nexus_chest, 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.