magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Mediaofflineeip155:8453Exactvia cdp
4cCovid-19MortalityIsaricCalculator
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 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.
2
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/4c",
"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/4c",
"tags": [
"4c",
"covid-19",
"mortality",
"isaric",
"calculator"
],
"mimeType": "application/json",
"description": "Knight 2020 ISARIC 4C Mortality Score: age (<50→0, 50–59→2, 60–69→4, 70–79→6, ≥80→7) + male 1 + comorbidity_count (0/1/≥2 → 0/1/2; caller-assigned Charlson-plus-obesity count) + RR (<20→0, 20–29→1, ≥30→2) + room-air SpO2 (<92→2) + GCS (<15→2) + urea (<7→0, 7–14→1, >14→3 mmol/L; or BUN/2.8) + CRP (<50→0, 50–99→1, ≥100→2). Max 21. Table 5: low 0–3, intermediate 4–8, high 9–14, very high ≥15. Not a COVID-19 diagnosis or treatment order.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 40,
"gcs": 15,
"sex": "female",
"crp_mg_l": 10,
"bun_mg_dl": 14,
"urea_mmol_l": 5,
"spo2_percent": 98,
"respiratory_rate": 16,
"comorbidity_count": 0
}
},
"output": {
"type": "json",
"example": {
"gcs": 15,
"sex": "female",
"score": 0,
"formula": "4c",
"citation": {
"id": "knight-2020",
"doi": "10.1136/bmj.m3339",
"pmid": "32907855",
"title": "Risk stratification of patients admitted to hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: development and validation of the 4C Mortality Score",
"source": "BMJ. 2020;370:m3339",
"authors": "Knight SR, Ho A, Pius R, Buchan I, Carson G, Drake TM, Dunning J, Fairfield CJ, Gamble C, Green CA, Gupta R, Halpin S, Hardwick HE, Holden KA, Horby PW, Jackson C, Mclean KA, Merson L, Nguyen-Van-Tam JS, Norman L, Noursadeghi M, Olliaro PL, Pritchard MG, Russell CD, Shaw CA, Sheikh A, Solomon T, Sudlow C, Swann OV, Turtle LCW, Openshaw PJM, Baillie JK, Semple MG, Docherty AB, Harrison EM; ISARIC4C investigators"
},
"crp_mg_l": 10,
"age_years": 40,
"max_score": 21,
"components": [
{
"value": 40,
"factor": "age",
"points": 0,
"present": false
},
{
"value": "female",
"factor": "sex",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "comorbidity_count",
"points": 0,
"present": false
},
{
"value": 16,
"factor": "respiratory_rate",
"points": 0,
"present": false
},
{
"value": 98,
"factor": "spo2_percent",
"points": 0,
"present": false
},
{
"value": 15,
"factor": "gcs",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "urea",
"points": 0,
"present": false
},
{
"value": 10,
"factor": "crp_mg_l",
"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.",
"four_c_band": "low",
"urea_mmol_l": 5,
"spo2_percent": 98,
"respiratory_rate": 16,
"comorbidity_count": 0,
"formula_expression": "4C = age (<50 0, 50–59 2, 60–69 4, 70–79 6, ≥80 7) + sex (female 0, male 1) + comorbidity_count (0→0, 1→1, ≥2→2) + respiratory_rate (<20 0, 20–29 1, ≥30 2) + spo2_percent (≥92 0, <92 2) + gcs (15 0, <15 2) + urea_mmol_l (<7 0, 7–14 1, >14 3) + crp_mg_l (<50 0, 50–99 1, ≥100 2); Knight 2020 Table 2; max 21; Table 5 bands low 0–3, intermediate 4–8, high 9–14, very_high ≥15"
}
},
"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",
"comorbidity_count",
"respiratory_rate",
"spo2_percent",
"gcs",
"crp_mg_l"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Knight 2020 Table 2: <50 scores 0; 50–59 scores 2; 60–69 scores 4; 70–79 scores 6; ≥80 scores 7."
},
"gcs": {
"type": "integer",
"description": "Caller-assigned total GCS as an integer 3–15. 15 scores 0; <15 scores 2 (Knight 2020). This API does not collect eye, verbal, or motor components."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Sex at birth (Knight 2020). female scores 0; male scores 1."
},
"crp_mg_l": {
"type": "number",
"description": "C-reactive protein in mg/L (0–500). Knight 2020: <50 scores 0; 50–99 scores 1; ≥100 scores 2."
},
"bun_mg_dl": {
"type": "number",
"description": "BUN in mg/dL (3–140). Converted as urea_mmol_l = bun_mg_dl / 2.8."
},
"urea_mmol_l": {
"type": "number",
"description": "Serum urea in mmol/L (1–50). Provide this or bun_mg_dl, not both. Knight 2020: <7 scores 0; 7–14 inclusive scores 1; >14 scores 3."
},
"spo2_percent": {
"type": "number",
"description": "Room-air SpO2 percent (50–100). Knight 2020: ≥92 scores 0; <92 scores 2. magent does not measure saturation."
},
"respiratory_rate": {
"type": "integer",
"description": "Respiratory rate in breaths/min (integer 4–80). Knight 2020: <20 scores 0; 20–29 scores 1; ≥30 scores 2. magent does not measure vitals."
},
"comorbidity_count": {
"type": "integer",
"description": "Caller-assigned count of Charlson-plus-obesity comorbidities from Knight 2020 (integer 0–20). 0 scores 0; 1 scores 1; ≥2 scores 2. magent does not compute Charlson."
}
}
}
},
"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/4c",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 40,
"gcs": 15,
"sex": "female",
"crp_mg_l": 10,
"bun_mg_dl": 14,
"urea_mmol_l": 5,
"spo2_percent": 98,
"respiratory_rate": 16,
"comorbidity_count": 0
},
{
"age": 40,
"gcs": 15,
"sex": "female",
"crp_mg_l": 10,
"bun_mg_dl": 14,
"urea_mmol_l": 5,
"spo2_percent": 98,
"respiratory_rate": 16,
"comorbidity_count": 0
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/4c",
"count": 2,
"items": [
{
"gcs": 15,
"sex": "female",
"score": 0,
"formula": "4c",
"citation": {
"id": "knight-2020",
"doi": "10.1136/bmj.m3339",
"pmid": "32907855",
"title": "Risk stratification of patients admitted to hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: development and validation of the 4C Mortality Score",
"source": "BMJ. 2020;370:m3339",
"authors": "Knight SR, Ho A, Pius R, Buchan I, Carson G, Drake TM, Dunning J, Fairfield CJ, Gamble C, Green CA, Gupta R, Halpin S, Hardwick HE, Holden KA, Horby PW, Jackson C, Mclean KA, Merson L, Nguyen-Van-Tam JS, Norman L, Noursadeghi M, Olliaro PL, Pritchard MG, Russell CD, Shaw CA, Sheikh A, Solomon T, Sudlow C, Swann OV, Turtle LCW, Openshaw PJM, Baillie JK, Semple MG, Docherty AB, Harrison EM; ISARIC4C investigators"
},
"crp_mg_l": 10,
"age_years": 40,
"max_score": 21,
"components": [
{
"value": 40,
"factor": "age",
"points": 0,
"present": false
},
{
"value": "female",
"factor": "sex",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "comorbidity_count",
"points": 0,
"present": false
},
{
"value": 16,
"factor": "respiratory_rate",
"points": 0,
"present": false
},
{
"value": 98,
"factor": "spo2_percent",
"points": 0,
"present": false
},
{
"value": 15,
"factor": "gcs",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "urea",
"points": 0,
"present": false
},
{
"value": 10,
"factor": "crp_mg_l",
"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.",
"four_c_band": "low",
"urea_mmol_l": 5,
"spo2_percent": 98,
"respiratory_rate": 16,
"comorbidity_count": 0,
"formula_expression": "4C = age (<50 0, 50–59 2, 60–69 4, 70–79 6, ≥80 7) + sex (female 0, male 1) + comorbidity_count (0→0, 1→1, ≥2→2) + respiratory_rate (<20 0, 20–29 1, ≥30 2) + spo2_percent (≥92 0, <92 2) + gcs (15 0, <15 2) + urea_mmol_l (<7 0, 7–14 1, >14 3) + crp_mg_l (<50 0, 50–99 1, ≥100 2); Knight 2020 Table 2; max 21; Table 5 bands low 0–3, intermediate 4–8, high 9–14, very_high ≥15"
},
{
"gcs": 15,
"sex": "female",
"score": 0,
"formula": "4c",
"citation": {
"id": "knight-2020",
"doi": "10.1136/bmj.m3339",
"pmid": "32907855",
"title": "Risk stratification of patients admitted to hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: development and validation of the 4C Mortality Score",
"source": "BMJ. 2020;370:m3339",
"authors": "Knight SR, Ho A, Pius R, Buchan I, Carson G, Drake TM, Dunning J, Fairfield CJ, Gamble C, Green CA, Gupta R, Halpin S, Hardwick HE, Holden KA, Horby PW, Jackson C, Mclean KA, Merson L, Nguyen-Van-Tam JS, Norman L, Noursadeghi M, Olliaro PL, Pritchard MG, Russell CD, Shaw CA, Sheikh A, Solomon T, Sudlow C, Swann OV, Turtle LCW, Openshaw PJM, Baillie JK, Semple MG, Docherty AB, Harrison EM; ISARIC4C investigators"
},
"crp_mg_l": 10,
"age_years": 40,
"max_score": 21,
"components": [
{
"value": 40,
"factor": "age",
"points": 0,
"present": false
},
{
"value": "female",
"factor": "sex",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "comorbidity_count",
"points": 0,
"present": false
},
{
"value": 16,
"factor": "respiratory_rate",
"points": 0,
"present": false
},
{
"value": 98,
"factor": "spo2_percent",
"points": 0,
"present": false
},
{
"value": 15,
"factor": "gcs",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "urea",
"points": 0,
"present": false
},
{
"value": 10,
"factor": "crp_mg_l",
"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.",
"four_c_band": "low",
"urea_mmol_l": 5,
"spo2_percent": 98,
"respiratory_rate": 16,
"comorbidity_count": 0,
"formula_expression": "4C = age (<50 0, 50–59 2, 60–69 4, 70–79 6, ≥80 7) + sex (female 0, male 1) + comorbidity_count (0→0, 1→1, ≥2→2) + respiratory_rate (<20 0, 20–29 1, ≥30 2) + spo2_percent (≥92 0, <92 2) + gcs (15 0, <15 2) + urea_mmol_l (<7 0, 7–14 1, >14 3) + crp_mg_l (<50 0, 50–99 1, ≥100 2); Knight 2020 Table 2; max 21; Table 5 bands low 0–3, intermediate 4–8, high 9–14, very_high ≥15"
}
]
}
},
"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",
"comorbidity_count",
"respiratory_rate",
"spo2_percent",
"gcs",
"crp_mg_l"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (18-120). Knight 2020 Table 2: <50 scores 0; 50–59 scores 2; 60–69 scores 4; 70–79 scores 6; ≥80 scores 7."
},
"gcs": {
"type": "integer",
"description": "Caller-assigned total GCS as an integer 3–15. 15 scores 0; <15 scores 2 (Knight 2020). This API does not collect eye, verbal, or motor components."
},
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Sex at birth (Knight 2020). female scores 0; male scores 1."
},
"crp_mg_l": {
"type": "number",
"description": "C-reactive protein in mg/L (0–500). Knight 2020: <50 scores 0; 50–99 scores 1; ≥100 scores 2."
},
"bun_mg_dl": {
"type": "number",
"description": "BUN in mg/dL (3–140). Converted as urea_mmol_l = bun_mg_dl / 2.8."
},
"urea_mmol_l": {
"type": "number",
"description": "Serum urea in mmol/L (1–50). Provide this or bun_mg_dl, not both. Knight 2020: <7 scores 0; 7–14 inclusive scores 1; >14 scores 3."
},
"spo2_percent": {
"type": "number",
"description": "Room-air SpO2 percent (50–100). Knight 2020: ≥92 scores 0; <92 scores 2. magent does not measure saturation."
},
"respiratory_rate": {
"type": "integer",
"description": "Respiratory rate in breaths/min (integer 4–80). Knight 2020: <20 scores 0; 20–29 scores 1; ≥30 scores 2. magent does not measure vitals."
},
"comorbidity_count": {
"type": "integer",
"description": "Caller-assigned count of Charlson-plus-obesity comorbidities from Knight 2020 (integer 0–20). 0 scores 0; 1 scores 1; ≥2 scores 2. magent does not compute Charlson."
}
}
},
"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)
- 2026-09-13 03:45Z
- 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. 13 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/4c, 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.