magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
InferenceLiveeip155:8453Exactvia cdp
KfreKidney-failureCkdCalculator
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 9 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 2026-08-31 16:01Z
—
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/kfre",
"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/kfre",
"tags": [
"kfre",
"kidney-failure",
"ckd",
"calculator"
],
"mimeType": "application/json",
"description": "Tangri 2011 4-variable Kidney Failure Risk Equation: 2- and 5-year risk of dialysis or transplant from age, male, eGFR, and urine ACR (mg/g). Risk = 1 - S0^exp(LP) with that paper's 4-variable coefficients. Caller supplies eGFR; magent does not compute CKD-EPI or assay ACR. Not the 8-variable model, not Tangri 2016 country S0, no race. Not a dialysis or transplant order. Not a medical device.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"male": true,
"acr_mg_g": 300,
"age_years": 55,
"egfr_ml_min": 30
}
},
"output": {
"type": "json",
"example": {
"male": true,
"formula": "kfre",
"acr_mg_g": 300,
"citation": {
"id": "tangri-2011",
"doi": "10.1001/jama.2011.451",
"pmid": "21642682",
"title": "A predictive model for progression of chronic kidney disease to kidney failure",
"source": "JAMA. 2011;305(15):1553-1559",
"authors": "Tangri N, Stevens LA, Griffith J, Tighiouart H, Djurdjev O, Naimark D, Levin A, Levey AS"
},
"age_years": 55,
"s0_2_year": 0.975,
"s0_5_year": 0.924,
"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.",
"egfr_ml_min": 30,
"linear_predictor": 1.3815,
"formula_expression": "LP = -0.2201*(age_years/10 - 7.036) + 0.2467*(male - 0.5642) - 0.5567*(egfr_ml_min/5 - 7.222) + 0.4510*(ln(acr_mg_g) - 5.137); 2-year risk = 1 - 0.9750^exp(LP); 5-year risk = 1 - 0.9240^exp(LP); Tangri 2011 4-variable only; male is 1 if true else 0; ACR mg/g natural log; caller supplies eGFR; not 8-variable; not Tangri 2016 country S0; no race",
"two_year_risk_percent": 9.6,
"five_year_risk_percent": 27
}
},
"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_years",
"male",
"egfr_ml_min",
"acr_mg_g"
],
"properties": {
"male": {
"type": "boolean",
"description": "true if male, false if female. Enters the linear predictor as 1 or 0 (centered at 0.5642). No race coefficient."
},
"acr_mg_g": {
"type": "number",
"description": "Urine albumin-to-creatinine ratio in mg/g (0.1-10000, magent clamp; must be positive). Enters as natural log, centered at 5.137. magent does not assay ACR and does not convert from mg/mmol."
},
"age_years": {
"type": "integer",
"description": "Age in years (18-90, magent clamp). Tangri 2011 4-variable model uses age as a continuous predictor (per 10 years, centered at 7.036). Adult CKD 3-5 derivation."
},
"egfr_ml_min": {
"type": "number",
"description": "Caller-supplied eGFR in mL/min/1.73 m2 (1-150, magent clamp; must be positive). Tangri 2011 derivation was CKD stages 3-5. magent does not compute CKD-EPI eGFR and does not assay creatinine."
}
}
}
},
"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/kfre",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"male": true,
"acr_mg_g": 300,
"age_years": 55,
"egfr_ml_min": 30
},
{
"male": true,
"acr_mg_g": 300,
"age_years": 55,
"egfr_ml_min": 30
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/kfre",
"count": 2,
"items": [
{
"male": true,
"formula": "kfre",
"acr_mg_g": 300,
"citation": {
"id": "tangri-2011",
"doi": "10.1001/jama.2011.451",
"pmid": "21642682",
"title": "A predictive model for progression of chronic kidney disease to kidney failure",
"source": "JAMA. 2011;305(15):1553-1559",
"authors": "Tangri N, Stevens LA, Griffith J, Tighiouart H, Djurdjev O, Naimark D, Levin A, Levey AS"
},
"age_years": 55,
"s0_2_year": 0.975,
"s0_5_year": 0.924,
"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.",
"egfr_ml_min": 30,
"linear_predictor": 1.3815,
"formula_expression": "LP = -0.2201*(age_years/10 - 7.036) + 0.2467*(male - 0.5642) - 0.5567*(egfr_ml_min/5 - 7.222) + 0.4510*(ln(acr_mg_g) - 5.137); 2-year risk = 1 - 0.9750^exp(LP); 5-year risk = 1 - 0.9240^exp(LP); Tangri 2011 4-variable only; male is 1 if true else 0; ACR mg/g natural log; caller supplies eGFR; not 8-variable; not Tangri 2016 country S0; no race",
"two_year_risk_percent": 9.6,
"five_year_risk_percent": 27
},
{
"male": true,
"formula": "kfre",
"acr_mg_g": 300,
"citation": {
"id": "tangri-2011",
"doi": "10.1001/jama.2011.451",
"pmid": "21642682",
"title": "A predictive model for progression of chronic kidney disease to kidney failure",
"source": "JAMA. 2011;305(15):1553-1559",
"authors": "Tangri N, Stevens LA, Griffith J, Tighiouart H, Djurdjev O, Naimark D, Levin A, Levey AS"
},
"age_years": 55,
"s0_2_year": 0.975,
"s0_5_year": 0.924,
"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.",
"egfr_ml_min": 30,
"linear_predictor": 1.3815,
"formula_expression": "LP = -0.2201*(age_years/10 - 7.036) + 0.2467*(male - 0.5642) - 0.5567*(egfr_ml_min/5 - 7.222) + 0.4510*(ln(acr_mg_g) - 5.137); 2-year risk = 1 - 0.9750^exp(LP); 5-year risk = 1 - 0.9240^exp(LP); Tangri 2011 4-variable only; male is 1 if true else 0; ACR mg/g natural log; caller supplies eGFR; not 8-variable; not Tangri 2016 country S0; no race",
"two_year_risk_percent": 9.6,
"five_year_risk_percent": 27
}
]
}
},
"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_years",
"male",
"egfr_ml_min",
"acr_mg_g"
],
"properties": {
"male": {
"type": "boolean",
"description": "true if male, false if female. Enters the linear predictor as 1 or 0 (centered at 0.5642). No race coefficient."
},
"acr_mg_g": {
"type": "number",
"description": "Urine albumin-to-creatinine ratio in mg/g (0.1-10000, magent clamp; must be positive). Enters as natural log, centered at 5.137. magent does not assay ACR and does not convert from mg/mmol."
},
"age_years": {
"type": "integer",
"description": "Age in years (18-90, magent clamp). Tangri 2011 4-variable model uses age as a continuous predictor (per 10 years, centered at 7.036). Adult CKD 3-5 derivation."
},
"egfr_ml_min": {
"type": "number",
"description": "Caller-supplied eGFR in mL/min/1.73 m2 (1-150, magent clamp; must be positive). Tangri 2011 derivation was CKD stages 3-5. magent does not compute CKD-EPI eGFR and does not assay creatinine."
}
}
},
"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 16:01Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 08:15Z
- 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. 9 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/kfre, 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.