magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
SearchLiveeip155:8453Exactvia cdp
ParcAppendicitisPediatricEmergencyCalculator
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 8 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 2026-09-01 09:21Z
—
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/parc",
"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/parc",
"tags": [
"parc",
"appendicitis",
"pediatric",
"emergency",
"calculator"
],
"mimeType": "application/json",
"description": "Kharbanda 2018 Table 3 pediatric appendicitis risk calculator (pARC): logistic probability from sex, age (5-18 years), pain duration, pain with walking, migration of pain to RLQ, maximal RLQ tenderness, abdominal guarding, and ANC (x10^3/uL; 1.77*sqrt(ANC) if <14, else constant 6.62). Returns logit and estimated_probability_percent. Not a medical device, not a diagnosis, not PAS, and not Alvarado. magent does not examine the child.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 15,
"sex": "female",
"anc_10e3_ul": 2,
"pain_duration": "lt_24",
"pain_with_walking": false,
"abdominal_guarding": false,
"pain_migration_rlq": false,
"maximal_tenderness_rlq": false
}
},
"output": {
"type": "json",
"example": {
"sex": "female",
"logit": -6.1968,
"formula": "parc",
"citation": {
"id": "kharbanda-2018",
"doi": "10.1542/peds.2017-2699",
"pmid": "29535251",
"title": "Development and Validation of a Novel Pediatric Appendicitis Risk Calculator (pARC)",
"source": "Pediatrics. 2018;141(4):e20172699",
"authors": "Kharbanda AB, Vazquez-Benitez G, Ballard DW, et al."
},
"age_years": 15,
"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.",
"anc_10e3_ul": 2,
"pain_duration": "lt_24",
"pain_with_walking": false,
"abdominal_guarding": false,
"formula_expression": "L = -8.7 + 1.28*male + age_sex + pain_duration + 1.05*pain_with_walking + 0.46*pain_migration_rlq + 1.14*maximal_tenderness_rlq + 0.67*abdominal_guarding + anc (Kharbanda 2018 Table 3); age 5-7.9 y 0.38; male 5-7.9 y -1.05; age 8-13.9 y -0.72 (male 8-13.9 y and female 8-11.9 y); reference = male 14-18 y and female 12-18 y; duration lt_24 0, 24_lt_48 0.47, 48_96 0.10; ANC <14 x10^3/uL: 1.77*sqrt(ANC); ANC >=14: 6.62 instead of the sqrt term; estimated_probability = 1 / (1 + exp(-L)); estimated_probability_percent = 100 * estimated_probability",
"pain_migration_rlq": false,
"estimated_probability": 0.002032,
"maximal_tenderness_rlq": false,
"estimated_probability_percent": 0.2
}
},
"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",
"sex",
"pain_duration",
"pain_with_walking",
"pain_migration_rlq",
"maximal_tenderness_rlq",
"abdominal_guarding",
"anc_10e3_ul"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in whole years from 5 to 18 (Kharbanda 2018 derivation). Age 5-7 maps to 5-7.9 y; male 8-13 and female 8-11 use the age 8-13.9 y term; male 14-18 y and female 12-18 y are the Table 3 reference."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex. Male adds 1.28. Combined with age for the Table 3 age-and-sex terms. magent does not examine the child."
},
"anc_10e3_ul": {
"type": "number",
"description": "Absolute neutrophil count in x10^3/uL (0-80). Kharbanda 2018 Table 3: if ANC < 14, add 1.77*sqrt(ANC); if ANC >= 14, add 6.62 instead of the sqrt term. Required; magent does not impute ANC from WBC."
},
"pain_duration": {
"enum": [
"lt_24",
"24_lt_48",
"48_96"
],
"type": "string",
"description": "Kharbanda 2018 Table 3 duration of pain as assigned by the caller: lt_24 (reference, 0), 24_lt_48 (+0.47), or 48_96 (+0.10). Derivation excluded pain beyond 96 hours. Do not send a nausea or vomiting flag."
},
"pain_with_walking": {
"type": "boolean",
"description": "Caller-assigned presence of pain with walking (Kharbanda 2018 Table 3 +1.05). magent does not examine the child."
},
"abdominal_guarding": {
"type": "boolean",
"description": "Caller-assigned abdominal guarding (Kharbanda 2018 Table 3 +0.67). magent does not examine the child."
},
"pain_migration_rlq": {
"type": "boolean",
"description": "Caller-assigned history of migration of pain to the right-lower quadrant (Kharbanda 2018 Table 3 +0.46). magent does not examine the child."
},
"maximal_tenderness_rlq": {
"type": "boolean",
"description": "Caller-assigned maximal tenderness in the right-lower quadrant (Kharbanda 2018 Table 3 +1.14). 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/parc",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 15,
"sex": "female",
"anc_10e3_ul": 2,
"pain_duration": "lt_24",
"pain_with_walking": false,
"abdominal_guarding": false,
"pain_migration_rlq": false,
"maximal_tenderness_rlq": false
},
{
"age": 15,
"sex": "female",
"anc_10e3_ul": 2,
"pain_duration": "lt_24",
"pain_with_walking": false,
"abdominal_guarding": false,
"pain_migration_rlq": false,
"maximal_tenderness_rlq": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/parc",
"count": 2,
"items": [
{
"sex": "female",
"logit": -6.1968,
"formula": "parc",
"citation": {
"id": "kharbanda-2018",
"doi": "10.1542/peds.2017-2699",
"pmid": "29535251",
"title": "Development and Validation of a Novel Pediatric Appendicitis Risk Calculator (pARC)",
"source": "Pediatrics. 2018;141(4):e20172699",
"authors": "Kharbanda AB, Vazquez-Benitez G, Ballard DW, et al."
},
"age_years": 15,
"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.",
"anc_10e3_ul": 2,
"pain_duration": "lt_24",
"pain_with_walking": false,
"abdominal_guarding": false,
"formula_expression": "L = -8.7 + 1.28*male + age_sex + pain_duration + 1.05*pain_with_walking + 0.46*pain_migration_rlq + 1.14*maximal_tenderness_rlq + 0.67*abdominal_guarding + anc (Kharbanda 2018 Table 3); age 5-7.9 y 0.38; male 5-7.9 y -1.05; age 8-13.9 y -0.72 (male 8-13.9 y and female 8-11.9 y); reference = male 14-18 y and female 12-18 y; duration lt_24 0, 24_lt_48 0.47, 48_96 0.10; ANC <14 x10^3/uL: 1.77*sqrt(ANC); ANC >=14: 6.62 instead of the sqrt term; estimated_probability = 1 / (1 + exp(-L)); estimated_probability_percent = 100 * estimated_probability",
"pain_migration_rlq": false,
"estimated_probability": 0.002032,
"maximal_tenderness_rlq": false,
"estimated_probability_percent": 0.2
},
{
"sex": "female",
"logit": -6.1968,
"formula": "parc",
"citation": {
"id": "kharbanda-2018",
"doi": "10.1542/peds.2017-2699",
"pmid": "29535251",
"title": "Development and Validation of a Novel Pediatric Appendicitis Risk Calculator (pARC)",
"source": "Pediatrics. 2018;141(4):e20172699",
"authors": "Kharbanda AB, Vazquez-Benitez G, Ballard DW, et al."
},
"age_years": 15,
"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.",
"anc_10e3_ul": 2,
"pain_duration": "lt_24",
"pain_with_walking": false,
"abdominal_guarding": false,
"formula_expression": "L = -8.7 + 1.28*male + age_sex + pain_duration + 1.05*pain_with_walking + 0.46*pain_migration_rlq + 1.14*maximal_tenderness_rlq + 0.67*abdominal_guarding + anc (Kharbanda 2018 Table 3); age 5-7.9 y 0.38; male 5-7.9 y -1.05; age 8-13.9 y -0.72 (male 8-13.9 y and female 8-11.9 y); reference = male 14-18 y and female 12-18 y; duration lt_24 0, 24_lt_48 0.47, 48_96 0.10; ANC <14 x10^3/uL: 1.77*sqrt(ANC); ANC >=14: 6.62 instead of the sqrt term; estimated_probability = 1 / (1 + exp(-L)); estimated_probability_percent = 100 * estimated_probability",
"pain_migration_rlq": false,
"estimated_probability": 0.002032,
"maximal_tenderness_rlq": false,
"estimated_probability_percent": 0.2
}
]
}
},
"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",
"sex",
"pain_duration",
"pain_with_walking",
"pain_migration_rlq",
"maximal_tenderness_rlq",
"abdominal_guarding",
"anc_10e3_ul"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in whole years from 5 to 18 (Kharbanda 2018 derivation). Age 5-7 maps to 5-7.9 y; male 8-13 and female 8-11 use the age 8-13.9 y term; male 14-18 y and female 12-18 y are the Table 3 reference."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex. Male adds 1.28. Combined with age for the Table 3 age-and-sex terms. magent does not examine the child."
},
"anc_10e3_ul": {
"type": "number",
"description": "Absolute neutrophil count in x10^3/uL (0-80). Kharbanda 2018 Table 3: if ANC < 14, add 1.77*sqrt(ANC); if ANC >= 14, add 6.62 instead of the sqrt term. Required; magent does not impute ANC from WBC."
},
"pain_duration": {
"enum": [
"lt_24",
"24_lt_48",
"48_96"
],
"type": "string",
"description": "Kharbanda 2018 Table 3 duration of pain as assigned by the caller: lt_24 (reference, 0), 24_lt_48 (+0.47), or 48_96 (+0.10). Derivation excluded pain beyond 96 hours. Do not send a nausea or vomiting flag."
},
"pain_with_walking": {
"type": "boolean",
"description": "Caller-assigned presence of pain with walking (Kharbanda 2018 Table 3 +1.05). magent does not examine the child."
},
"abdominal_guarding": {
"type": "boolean",
"description": "Caller-assigned abdominal guarding (Kharbanda 2018 Table 3 +0.67). magent does not examine the child."
},
"pain_migration_rlq": {
"type": "boolean",
"description": "Caller-assigned history of migration of pain to the right-lower quadrant (Kharbanda 2018 Table 3 +0.46). magent does not examine the child."
},
"maximal_tenderness_rlq": {
"type": "boolean",
"description": "Caller-assigned maximal tenderness in the right-lower quadrant (Kharbanda 2018 Table 3 +1.14). 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
- 2026-09-01 09:21Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 07:15Z
- 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. 8 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/parc, 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.