magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Mediaofflineeip155:8453Exactvia cdp
Gi-gpaNeurologyBrain-metastasesPrognosisCalculator
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 22:41Z
—
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/gi_gpa",
"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/gi_gpa",
"tags": [
"gi-gpa",
"neurology",
"brain-metastases",
"prognosis",
"calculator"
],
"mimeType": "application/json",
"description": "Sperduto 2019 updated GI-GPA: KPS <80 = 0, 80 = 1.0, 90-100 = 2.0; age >=60 = 0, <60 = 0.5; extracranial metastases present = 0, absent = 0.5; number of brain metastases >3 = 0, 2-3 = 0.5, 1 = 1.0. Max 4.0. GPA 0-1.0 / 1.5-2.0 / 2.5-3.0 / 3.5-4.0 median survival 3, 7, 11, 17 months (abstract/KM). Not a treatment order. Not lung-molGPA. magent does not assign KPS.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 50,
"kps": 100,
"brain_metastasis_count": 1,
"extracranial_metastases": false
}
},
"output": {
"type": "json",
"example": {
"age": 50,
"kps": 100,
"score": 4,
"formula": "gi_gpa",
"citation": {
"id": "sperduto-2019-gi-gpa",
"doi": "10.1016/j.ctro.2019.06.007",
"pmid": "31341974",
"title": "Estimating survival in patients with gastrointestinal cancers and brain metastases: An update of the graded prognostic assessment for gastrointestinal cancers (GI-GPA)",
"source": "Clin Transl Radiat Oncol. 2019;18:39-45",
"authors": "Sperduto PW, Fang P, Li J, et al."
},
"gpa_group": "3.5-4.0",
"max_score": 4,
"components": [
{
"value": 100,
"factor": "kps",
"points": 2,
"present": true
},
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": false,
"factor": "extracranial_metastases",
"points": 0.5,
"present": true
},
{
"value": 1,
"factor": "brain_metastasis_count",
"points": 1,
"present": true
}
],
"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": "GI-GPA = kps_pts + age_pts + extracranial_pts + brain_met_pts; KPS <80 (10-70) 0, 80 1.0, 90-100 2.0; age >=60 0, <60 0.5; extracranial mets present 0, absent 0.5; brain mets >3 0, 2-3 0.5, 1 1.0; groups 0-1.0 / 1.5-2.0 / 2.5-3.0 / 3.5-4.0; max 4.0 (Sperduto 2019 Table 4; median survival from abstract/KM 3, 7, 11, 17 months)",
"brain_metastasis_count": 1,
"median_survival_months": 17,
"extracranial_metastases": 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": [
"kps",
"age",
"extracranial_metastases",
"brain_metastasis_count"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Sperduto 2019 Table 4: >=60 scores 0; <60 scores 0.5."
},
"kps": {
"type": "integer",
"description": "Caller-assigned Karnofsky Performance Status decade 10, 20, 30, 40, 50, 60, 70, 80, 90, or 100. Sperduto 2019 Table 4: <80 (10-70) scores 0; 80 scores 1.0; 90-100 scores 2.0. Grade 0 (dead) is not scored. magent does not assign KPS."
},
"brain_metastasis_count": {
"type": "integer",
"description": "Number of brain metastases (integer 1-50). Sperduto 2019 Table 4: >3 scores 0; 2-3 scores 0.5; 1 scores 1.0. magent does not count metastases on imaging."
},
"extracranial_metastases": {
"type": "boolean",
"description": "Extracranial metastases (ECM). true (present) scores 0; false (absent) scores 0.5 (Sperduto 2019 Table 4). magent does not stage extracranial disease."
}
}
}
},
"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/gi_gpa",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 50,
"kps": 100,
"brain_metastasis_count": 1,
"extracranial_metastases": false
},
{
"age": 50,
"kps": 100,
"brain_metastasis_count": 1,
"extracranial_metastases": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/gi_gpa",
"count": 2,
"items": [
{
"age": 50,
"kps": 100,
"score": 4,
"formula": "gi_gpa",
"citation": {
"id": "sperduto-2019-gi-gpa",
"doi": "10.1016/j.ctro.2019.06.007",
"pmid": "31341974",
"title": "Estimating survival in patients with gastrointestinal cancers and brain metastases: An update of the graded prognostic assessment for gastrointestinal cancers (GI-GPA)",
"source": "Clin Transl Radiat Oncol. 2019;18:39-45",
"authors": "Sperduto PW, Fang P, Li J, et al."
},
"gpa_group": "3.5-4.0",
"max_score": 4,
"components": [
{
"value": 100,
"factor": "kps",
"points": 2,
"present": true
},
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": false,
"factor": "extracranial_metastases",
"points": 0.5,
"present": true
},
{
"value": 1,
"factor": "brain_metastasis_count",
"points": 1,
"present": true
}
],
"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": "GI-GPA = kps_pts + age_pts + extracranial_pts + brain_met_pts; KPS <80 (10-70) 0, 80 1.0, 90-100 2.0; age >=60 0, <60 0.5; extracranial mets present 0, absent 0.5; brain mets >3 0, 2-3 0.5, 1 1.0; groups 0-1.0 / 1.5-2.0 / 2.5-3.0 / 3.5-4.0; max 4.0 (Sperduto 2019 Table 4; median survival from abstract/KM 3, 7, 11, 17 months)",
"brain_metastasis_count": 1,
"median_survival_months": 17,
"extracranial_metastases": false
},
{
"age": 50,
"kps": 100,
"score": 4,
"formula": "gi_gpa",
"citation": {
"id": "sperduto-2019-gi-gpa",
"doi": "10.1016/j.ctro.2019.06.007",
"pmid": "31341974",
"title": "Estimating survival in patients with gastrointestinal cancers and brain metastases: An update of the graded prognostic assessment for gastrointestinal cancers (GI-GPA)",
"source": "Clin Transl Radiat Oncol. 2019;18:39-45",
"authors": "Sperduto PW, Fang P, Li J, et al."
},
"gpa_group": "3.5-4.0",
"max_score": 4,
"components": [
{
"value": 100,
"factor": "kps",
"points": 2,
"present": true
},
{
"value": 50,
"factor": "age",
"points": 0.5,
"present": true
},
{
"value": false,
"factor": "extracranial_metastases",
"points": 0.5,
"present": true
},
{
"value": 1,
"factor": "brain_metastasis_count",
"points": 1,
"present": true
}
],
"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": "GI-GPA = kps_pts + age_pts + extracranial_pts + brain_met_pts; KPS <80 (10-70) 0, 80 1.0, 90-100 2.0; age >=60 0, <60 0.5; extracranial mets present 0, absent 0.5; brain mets >3 0, 2-3 0.5, 1 1.0; groups 0-1.0 / 1.5-2.0 / 2.5-3.0 / 3.5-4.0; max 4.0 (Sperduto 2019 Table 4; median survival from abstract/KM 3, 7, 11, 17 months)",
"brain_metastasis_count": 1,
"median_survival_months": 17,
"extracranial_metastases": 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": [
"kps",
"age",
"extracranial_metastases",
"brain_metastasis_count"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Sperduto 2019 Table 4: >=60 scores 0; <60 scores 0.5."
},
"kps": {
"type": "integer",
"description": "Caller-assigned Karnofsky Performance Status decade 10, 20, 30, 40, 50, 60, 70, 80, 90, or 100. Sperduto 2019 Table 4: <80 (10-70) scores 0; 80 scores 1.0; 90-100 scores 2.0. Grade 0 (dead) is not scored. magent does not assign KPS."
},
"brain_metastasis_count": {
"type": "integer",
"description": "Number of brain metastases (integer 1-50). Sperduto 2019 Table 4: >3 scores 0; 2-3 scores 0.5; 1 scores 1.0. magent does not count metastases on imaging."
},
"extracranial_metastases": {
"type": "boolean",
"description": "Extracranial metastases (ECM). true (present) scores 0; false (absent) scores 0.5 (Sperduto 2019 Table 4). magent does not stage extracranial disease."
}
}
},
"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 22:41Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-10 13:45Z
- x402 version
- 2
- Max timeout
- 600s
- Liveness probe
- HTTP 0
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/gi_gpa, 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.