magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
SearchLiveeip155:8453Exactvia cdp
GoutArthritisEmergencyUric-acidCalculator
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 13:29Z
—
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/gout_rule",
"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/gout_rule",
"tags": [
"gout",
"arthritis",
"emergency",
"uric-acid",
"calculator"
],
"mimeType": "application/json",
"description": "Janssens 2010 diagnostic rule for acute gouty arthritis without joint fluid: male 2, previous arthritis attack 2, onset within 1 day 0.5, joint redness 1, MTP1 2.5, hypertension or CVD 1.5, uric acid >5.88 mg/dL or >350 µmol/L 3.5; max 13. Low ≤4, intermediate 4.5–7.5, high ≥8. uric_acid_mg_dl or uric_acid_umol_l, not both. Deterministic published score; not a gout diagnosis; magent does not examine joints or replace synovial crystal analysis.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"sex": "female",
"joint_redness": false,
"uric_acid_mg_dl": 5,
"mtp1_involvement": false,
"uric_acid_umol_l": 300,
"onset_within_1_day": false,
"hypertension_or_cvd": false,
"previous_arthritis_attack": false
}
},
"output": {
"type": "json",
"example": {
"score": 0,
"formula": "gout_rule",
"citation": {
"id": "janssens-2010",
"doi": "10.1001/archinternmed.2010.196",
"pmid": "20625017",
"title": "A diagnostic rule for acute gouty arthritis in primary care without joint fluid analysis",
"source": "Arch Intern Med. 2010;170(13):1120-1126",
"authors": "Janssens HJEM, Fransen J, van de Lisdonk EH, van Riel PLCM, van Weel C, Janssen M"
},
"gout_band": "low",
"max_score": 13,
"components": [
{
"factor": "male",
"points": 0,
"present": false
},
{
"factor": "previous_arthritis_attack",
"points": 0,
"present": false
},
{
"factor": "onset_within_1_day",
"points": 0,
"present": false
},
{
"factor": "joint_redness",
"points": 0,
"present": false
},
{
"factor": "mtp1_involvement",
"points": 0,
"present": false
},
{
"factor": "hypertension_or_cvd",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "uric_acid",
"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.",
"formula_expression": "gout_rule = 2*male + 2*previous_arthritis_attack + 0.5*onset_within_1_day + 1*joint_redness + 2.5*mtp1_involvement + 1.5*hypertension_or_cvd + 3.5*(uric_acid_mg_dl>5.88 | uric_acid_umol_l>350); Janssens 2010; max 13; low ≤4, intermediate 4.5-7.5, high ≥8"
}
},
"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": [
"sex",
"previous_arthritis_attack",
"onset_within_1_day",
"joint_redness",
"mtp1_involvement",
"hypertension_or_cvd"
],
"properties": {
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex (Janssens 2010). male scores 2.0; female scores 0. magent does not assign sex."
},
"joint_redness": {
"type": "boolean",
"description": "Joint redness as assigned by the caller (Janssens 2010). true scores 1.0. magent does not examine joints."
},
"uric_acid_mg_dl": {
"type": "number",
"description": "Serum uric acid in mg/dL (1-20). Provide this or uric_acid_umol_l, not both. Scores 3.5 when >5.88; 5.88 does not score. magent does not assay uric acid."
},
"mtp1_involvement": {
"type": "boolean",
"description": "Involvement of the first metatarsophalangeal joint (Janssens 2010). true scores 2.5. magent does not examine joints."
},
"uric_acid_umol_l": {
"type": "number",
"description": "Serum uric acid in µmol/L (60-1190). Provide this or uric_acid_mg_dl, not both. Scores 3.5 when >350; 350 does not score. magent does not assay uric acid."
},
"onset_within_1_day": {
"type": "boolean",
"description": "Onset within 1 day (Janssens 2010). true scores 0.5. magent does not timestamp onset."
},
"hypertension_or_cvd": {
"type": "boolean",
"description": "Hypertension or one or more cardiovascular diseases (Janssens 2010). true scores 1.5. magent does not diagnose hypertension or cardiovascular disease."
},
"previous_arthritis_attack": {
"type": "boolean",
"description": "Previous patient-reported arthritis attack (Janssens 2010). true scores 2.0. magent does not take a history."
}
}
}
},
"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/gout_rule",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"sex": "female",
"joint_redness": false,
"uric_acid_mg_dl": 5,
"mtp1_involvement": false,
"uric_acid_umol_l": 300,
"onset_within_1_day": false,
"hypertension_or_cvd": false,
"previous_arthritis_attack": false
},
{
"sex": "female",
"joint_redness": false,
"uric_acid_mg_dl": 5,
"mtp1_involvement": false,
"uric_acid_umol_l": 300,
"onset_within_1_day": false,
"hypertension_or_cvd": false,
"previous_arthritis_attack": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/gout_rule",
"count": 2,
"items": [
{
"score": 0,
"formula": "gout_rule",
"citation": {
"id": "janssens-2010",
"doi": "10.1001/archinternmed.2010.196",
"pmid": "20625017",
"title": "A diagnostic rule for acute gouty arthritis in primary care without joint fluid analysis",
"source": "Arch Intern Med. 2010;170(13):1120-1126",
"authors": "Janssens HJEM, Fransen J, van de Lisdonk EH, van Riel PLCM, van Weel C, Janssen M"
},
"gout_band": "low",
"max_score": 13,
"components": [
{
"factor": "male",
"points": 0,
"present": false
},
{
"factor": "previous_arthritis_attack",
"points": 0,
"present": false
},
{
"factor": "onset_within_1_day",
"points": 0,
"present": false
},
{
"factor": "joint_redness",
"points": 0,
"present": false
},
{
"factor": "mtp1_involvement",
"points": 0,
"present": false
},
{
"factor": "hypertension_or_cvd",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "uric_acid",
"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.",
"formula_expression": "gout_rule = 2*male + 2*previous_arthritis_attack + 0.5*onset_within_1_day + 1*joint_redness + 2.5*mtp1_involvement + 1.5*hypertension_or_cvd + 3.5*(uric_acid_mg_dl>5.88 | uric_acid_umol_l>350); Janssens 2010; max 13; low ≤4, intermediate 4.5-7.5, high ≥8"
},
{
"score": 0,
"formula": "gout_rule",
"citation": {
"id": "janssens-2010",
"doi": "10.1001/archinternmed.2010.196",
"pmid": "20625017",
"title": "A diagnostic rule for acute gouty arthritis in primary care without joint fluid analysis",
"source": "Arch Intern Med. 2010;170(13):1120-1126",
"authors": "Janssens HJEM, Fransen J, van de Lisdonk EH, van Riel PLCM, van Weel C, Janssen M"
},
"gout_band": "low",
"max_score": 13,
"components": [
{
"factor": "male",
"points": 0,
"present": false
},
{
"factor": "previous_arthritis_attack",
"points": 0,
"present": false
},
{
"factor": "onset_within_1_day",
"points": 0,
"present": false
},
{
"factor": "joint_redness",
"points": 0,
"present": false
},
{
"factor": "mtp1_involvement",
"points": 0,
"present": false
},
{
"factor": "hypertension_or_cvd",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "uric_acid",
"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.",
"formula_expression": "gout_rule = 2*male + 2*previous_arthritis_attack + 0.5*onset_within_1_day + 1*joint_redness + 2.5*mtp1_involvement + 1.5*hypertension_or_cvd + 3.5*(uric_acid_mg_dl>5.88 | uric_acid_umol_l>350); Janssens 2010; max 13; low ≤4, intermediate 4.5-7.5, high ≥8"
}
]
}
},
"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": [
"sex",
"previous_arthritis_attack",
"onset_within_1_day",
"joint_redness",
"mtp1_involvement",
"hypertension_or_cvd"
],
"properties": {
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Caller-assigned sex (Janssens 2010). male scores 2.0; female scores 0. magent does not assign sex."
},
"joint_redness": {
"type": "boolean",
"description": "Joint redness as assigned by the caller (Janssens 2010). true scores 1.0. magent does not examine joints."
},
"uric_acid_mg_dl": {
"type": "number",
"description": "Serum uric acid in mg/dL (1-20). Provide this or uric_acid_umol_l, not both. Scores 3.5 when >5.88; 5.88 does not score. magent does not assay uric acid."
},
"mtp1_involvement": {
"type": "boolean",
"description": "Involvement of the first metatarsophalangeal joint (Janssens 2010). true scores 2.5. magent does not examine joints."
},
"uric_acid_umol_l": {
"type": "number",
"description": "Serum uric acid in µmol/L (60-1190). Provide this or uric_acid_mg_dl, not both. Scores 3.5 when >350; 350 does not score. magent does not assay uric acid."
},
"onset_within_1_day": {
"type": "boolean",
"description": "Onset within 1 day (Janssens 2010). true scores 0.5. magent does not timestamp onset."
},
"hypertension_or_cvd": {
"type": "boolean",
"description": "Hypertension or one or more cardiovascular diseases (Janssens 2010). true scores 1.5. magent does not diagnose hypertension or cardiovascular disease."
},
"previous_arthritis_attack": {
"type": "boolean",
"description": "Previous patient-reported arthritis attack (Janssens 2010). true scores 2.0. magent does not take a history."
}
}
},
"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 13:29Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 07:45Z
- 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/gout_rule, 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.