magent
Chong 2010 RIPASA score from 15 caller-assigned findings (half-points; max 16). Age <40 scores 1.0, ≥40 scores 0.5; male 1.0, female 0.5; symptoms <48h 1.0, otherwise 0.5. Guarding and Rovsing 2.0 each. Fever, raised WCC, and foreign NRIC are caller-assigned; magent does not apply a °C or WBC cutoff. Derivation ROC: <7.5 below_cutoff, ≥7.5 at_or_above_cutoff. Not a diagnosis or operating-room protocol. magent does not examine the abdomen.
SearchLiveeip155:8453Exactvia cdp
RipasaAppendicitisInfectionCalculator
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 13:16Z
—
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/ripasa",
"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/ripasa",
"tags": [
"ripasa",
"appendicitis",
"infection",
"calculator"
],
"mimeType": "application/json",
"description": "Chong 2010 RIPASA score from 15 caller-assigned findings (half-points; max 16). Age <40 scores 1.0, ≥40 scores 0.5; male 1.0, female 0.5; symptoms <48h 1.0, otherwise 0.5. Guarding and Rovsing 2.0 each. Fever, raised WCC, and foreign NRIC are caller-assigned; magent does not apply a °C or WBC cutoff. Derivation ROC: <7.5 below_cutoff, ≥7.5 at_or_above_cutoff. Not a diagnosis or operating-room protocol. magent does not examine the abdomen.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 50,
"sex": "female",
"fever": false,
"anorexia": false,
"guarding": false,
"rif_pain": false,
"raised_wcc": false,
"foreign_nric": false,
"rovsing_sign": false,
"rif_tenderness": false,
"nausea_vomiting": false,
"symptoms_lt_48h": false,
"migration_to_rif": false,
"rebound_tenderness": false,
"negative_urinalysis": false
}
},
"output": {
"type": "json",
"example": {
"age": 50,
"sex": "female",
"score": 1.5,
"formula": "ripasa",
"citation": {
"id": "chong-2010",
"pmid": "20428744",
"title": "Development of the RIPASA score: a new appendicitis scoring system for the diagnosis of acute appendicitis",
"source": "Singapore Med J. 2010;51(3):220-225",
"authors": "Chong CF, Adi MIW, Thien A, Suyoi A, Mackie AJ, Tin AS, Tripathi S, Jaman NH, Tan KK, Kok KY, Mathew VV, Paw O, Chua HB, Yapp SK"
},
"max_score": 16,
"components": [
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": "female",
"factor": "sex",
"points": 0.5,
"present": true
},
{
"factor": "rif_pain",
"points": 0,
"present": false
},
{
"factor": "migration_to_rif",
"points": 0,
"present": false
},
{
"factor": "nausea_vomiting",
"points": 0,
"present": false
},
{
"factor": "anorexia",
"points": 0,
"present": false
},
{
"value": false,
"factor": "symptoms_lt_48h",
"points": 0.5,
"present": true
},
{
"factor": "rif_tenderness",
"points": 0,
"present": false
},
{
"factor": "guarding",
"points": 0,
"present": false
},
{
"factor": "rebound_tenderness",
"points": 0,
"present": false
},
{
"factor": "rovsing_sign",
"points": 0,
"present": false
},
{
"factor": "fever",
"points": 0,
"present": false
},
{
"factor": "raised_wcc",
"points": 0,
"present": false
},
{
"factor": "negative_urinalysis",
"points": 0,
"present": false
},
{
"factor": "foreign_nric",
"points": 0,
"present": 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.",
"ripasa_band": "below_cutoff",
"formula_expression": "RIPASA = (age<40 → 1.0; age≥40 → 0.5) + (male 1.0; female 0.5) + 0.5*rif_pain + 0.5*migration_to_rif + nausea_vomiting + anorexia + (symptoms_lt_48h 1.0; else 0.5) + rif_tenderness + 2*guarding + rebound_tenderness + 2*rovsing_sign + fever + raised_wcc + negative_urinalysis + foreign_nric; Chong 2010; max 16; <7.5 below_cutoff, ≥7.5 at_or_above_cutoff"
}
},
"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",
"rif_pain",
"migration_to_rif",
"nausea_vomiting",
"anorexia",
"symptoms_lt_48h",
"rif_tenderness",
"guarding",
"rebound_tenderness",
"rovsing_sign",
"fever",
"raised_wcc",
"negative_urinalysis",
"foreign_nric"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years as an integer from 1 to 120 (Chong 2010). <40 scores 1.0; ≥40 scores 0.5 (age 40 is the ≥40 arm). magent does not assign age."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex (Chong 2010). male scores 1.0; female scores 0.5. magent does not assign sex."
},
"fever": {
"type": "boolean",
"description": "Caller-assigned fever flag (Chong 2010). true scores 1.0. magent does not apply a °C cutoff."
},
"anorexia": {
"type": "boolean",
"description": "Anorexia (Chong 2010). true scores 1.0. magent does not take a history."
},
"guarding": {
"type": "boolean",
"description": "Guarding (Chong 2010). true scores 2.0. magent does not examine the abdomen."
},
"rif_pain": {
"type": "boolean",
"description": "Pain in the right iliac fossa (Chong 2010). true scores 0.5. magent does not take a history."
},
"raised_wcc": {
"type": "boolean",
"description": "Caller-assigned raised white-cell-count flag (Chong 2010). true scores 1.0. magent does not apply a WBC cutoff."
},
"foreign_nric": {
"type": "boolean",
"description": "Caller-assigned foreign national registration identity card item (Chong 2010). true scores 1.0. magent does not read identity documents."
},
"rovsing_sign": {
"type": "boolean",
"description": "Rovsing sign (Chong 2010). true scores 2.0. magent does not examine the abdomen."
},
"rif_tenderness": {
"type": "boolean",
"description": "Right-iliac-fossa tenderness (Chong 2010). true scores 1.0. magent does not examine the abdomen."
},
"nausea_vomiting": {
"type": "boolean",
"description": "Nausea or vomiting (Chong 2010). true scores 1.0. magent does not take a history."
},
"symptoms_lt_48h": {
"type": "boolean",
"description": "true when symptom duration is under 48 hours (Chong 2010 <48h arm, 1.0). false scores 0.5 (the >48h arm; 48 hours is locked to this arm). magent does not timestamp onset."
},
"migration_to_rif": {
"type": "boolean",
"description": "Migration of pain to the right iliac fossa (Chong 2010). true scores 0.5. magent does not take a history."
},
"rebound_tenderness": {
"type": "boolean",
"description": "Rebound tenderness (Chong 2010). true scores 1.0. magent does not examine the abdomen."
},
"negative_urinalysis": {
"type": "boolean",
"description": "Negative urinalysis (Chong 2010). true scores 1.0. magent does not assay urine."
}
}
}
},
"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/ripasa",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 50,
"sex": "female",
"fever": false,
"anorexia": false,
"guarding": false,
"rif_pain": false,
"raised_wcc": false,
"foreign_nric": false,
"rovsing_sign": false,
"rif_tenderness": false,
"nausea_vomiting": false,
"symptoms_lt_48h": false,
"migration_to_rif": false,
"rebound_tenderness": false,
"negative_urinalysis": false
},
{
"age": 50,
"sex": "female",
"fever": false,
"anorexia": false,
"guarding": false,
"rif_pain": false,
"raised_wcc": false,
"foreign_nric": false,
"rovsing_sign": false,
"rif_tenderness": false,
"nausea_vomiting": false,
"symptoms_lt_48h": false,
"migration_to_rif": false,
"rebound_tenderness": false,
"negative_urinalysis": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/ripasa",
"count": 2,
"items": [
{
"age": 50,
"sex": "female",
"score": 1.5,
"formula": "ripasa",
"citation": {
"id": "chong-2010",
"pmid": "20428744",
"title": "Development of the RIPASA score: a new appendicitis scoring system for the diagnosis of acute appendicitis",
"source": "Singapore Med J. 2010;51(3):220-225",
"authors": "Chong CF, Adi MIW, Thien A, Suyoi A, Mackie AJ, Tin AS, Tripathi S, Jaman NH, Tan KK, Kok KY, Mathew VV, Paw O, Chua HB, Yapp SK"
},
"max_score": 16,
"components": [
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": "female",
"factor": "sex",
"points": 0.5,
"present": true
},
{
"factor": "rif_pain",
"points": 0,
"present": false
},
{
"factor": "migration_to_rif",
"points": 0,
"present": false
},
{
"factor": "nausea_vomiting",
"points": 0,
"present": false
},
{
"factor": "anorexia",
"points": 0,
"present": false
},
{
"value": false,
"factor": "symptoms_lt_48h",
"points": 0.5,
"present": true
},
{
"factor": "rif_tenderness",
"points": 0,
"present": false
},
{
"factor": "guarding",
"points": 0,
"present": false
},
{
"factor": "rebound_tenderness",
"points": 0,
"present": false
},
{
"factor": "rovsing_sign",
"points": 0,
"present": false
},
{
"factor": "fever",
"points": 0,
"present": false
},
{
"factor": "raised_wcc",
"points": 0,
"present": false
},
{
"factor": "negative_urinalysis",
"points": 0,
"present": false
},
{
"factor": "foreign_nric",
"points": 0,
"present": 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.",
"ripasa_band": "below_cutoff",
"formula_expression": "RIPASA = (age<40 → 1.0; age≥40 → 0.5) + (male 1.0; female 0.5) + 0.5*rif_pain + 0.5*migration_to_rif + nausea_vomiting + anorexia + (symptoms_lt_48h 1.0; else 0.5) + rif_tenderness + 2*guarding + rebound_tenderness + 2*rovsing_sign + fever + raised_wcc + negative_urinalysis + foreign_nric; Chong 2010; max 16; <7.5 below_cutoff, ≥7.5 at_or_above_cutoff"
},
{
"age": 50,
"sex": "female",
"score": 1.5,
"formula": "ripasa",
"citation": {
"id": "chong-2010",
"pmid": "20428744",
"title": "Development of the RIPASA score: a new appendicitis scoring system for the diagnosis of acute appendicitis",
"source": "Singapore Med J. 2010;51(3):220-225",
"authors": "Chong CF, Adi MIW, Thien A, Suyoi A, Mackie AJ, Tin AS, Tripathi S, Jaman NH, Tan KK, Kok KY, Mathew VV, Paw O, Chua HB, Yapp SK"
},
"max_score": 16,
"components": [
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": "female",
"factor": "sex",
"points": 0.5,
"present": true
},
{
"factor": "rif_pain",
"points": 0,
"present": false
},
{
"factor": "migration_to_rif",
"points": 0,
"present": false
},
{
"factor": "nausea_vomiting",
"points": 0,
"present": false
},
{
"factor": "anorexia",
"points": 0,
"present": false
},
{
"value": false,
"factor": "symptoms_lt_48h",
"points": 0.5,
"present": true
},
{
"factor": "rif_tenderness",
"points": 0,
"present": false
},
{
"factor": "guarding",
"points": 0,
"present": false
},
{
"factor": "rebound_tenderness",
"points": 0,
"present": false
},
{
"factor": "rovsing_sign",
"points": 0,
"present": false
},
{
"factor": "fever",
"points": 0,
"present": false
},
{
"factor": "raised_wcc",
"points": 0,
"present": false
},
{
"factor": "negative_urinalysis",
"points": 0,
"present": false
},
{
"factor": "foreign_nric",
"points": 0,
"present": 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.",
"ripasa_band": "below_cutoff",
"formula_expression": "RIPASA = (age<40 → 1.0; age≥40 → 0.5) + (male 1.0; female 0.5) + 0.5*rif_pain + 0.5*migration_to_rif + nausea_vomiting + anorexia + (symptoms_lt_48h 1.0; else 0.5) + rif_tenderness + 2*guarding + rebound_tenderness + 2*rovsing_sign + fever + raised_wcc + negative_urinalysis + foreign_nric; Chong 2010; max 16; <7.5 below_cutoff, ≥7.5 at_or_above_cutoff"
}
]
}
},
"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",
"rif_pain",
"migration_to_rif",
"nausea_vomiting",
"anorexia",
"symptoms_lt_48h",
"rif_tenderness",
"guarding",
"rebound_tenderness",
"rovsing_sign",
"fever",
"raised_wcc",
"negative_urinalysis",
"foreign_nric"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years as an integer from 1 to 120 (Chong 2010). <40 scores 1.0; ≥40 scores 0.5 (age 40 is the ≥40 arm). magent does not assign age."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex (Chong 2010). male scores 1.0; female scores 0.5. magent does not assign sex."
},
"fever": {
"type": "boolean",
"description": "Caller-assigned fever flag (Chong 2010). true scores 1.0. magent does not apply a °C cutoff."
},
"anorexia": {
"type": "boolean",
"description": "Anorexia (Chong 2010). true scores 1.0. magent does not take a history."
},
"guarding": {
"type": "boolean",
"description": "Guarding (Chong 2010). true scores 2.0. magent does not examine the abdomen."
},
"rif_pain": {
"type": "boolean",
"description": "Pain in the right iliac fossa (Chong 2010). true scores 0.5. magent does not take a history."
},
"raised_wcc": {
"type": "boolean",
"description": "Caller-assigned raised white-cell-count flag (Chong 2010). true scores 1.0. magent does not apply a WBC cutoff."
},
"foreign_nric": {
"type": "boolean",
"description": "Caller-assigned foreign national registration identity card item (Chong 2010). true scores 1.0. magent does not read identity documents."
},
"rovsing_sign": {
"type": "boolean",
"description": "Rovsing sign (Chong 2010). true scores 2.0. magent does not examine the abdomen."
},
"rif_tenderness": {
"type": "boolean",
"description": "Right-iliac-fossa tenderness (Chong 2010). true scores 1.0. magent does not examine the abdomen."
},
"nausea_vomiting": {
"type": "boolean",
"description": "Nausea or vomiting (Chong 2010). true scores 1.0. magent does not take a history."
},
"symptoms_lt_48h": {
"type": "boolean",
"description": "true when symptom duration is under 48 hours (Chong 2010 <48h arm, 1.0). false scores 0.5 (the >48h arm; 48 hours is locked to this arm). magent does not timestamp onset."
},
"migration_to_rif": {
"type": "boolean",
"description": "Migration of pain to the right iliac fossa (Chong 2010). true scores 0.5. magent does not take a history."
},
"rebound_tenderness": {
"type": "boolean",
"description": "Rebound tenderness (Chong 2010). true scores 1.0. magent does not examine the abdomen."
},
"negative_urinalysis": {
"type": "boolean",
"description": "Negative urinalysis (Chong 2010). true scores 1.0. magent does not assay urine."
}
}
},
"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 13:16Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 10:15Z
- 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/ripasa, 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.