magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Infraofflineeip155:8453Exactvia cdp
KegfrKidneyCreatinineGfrAki
Calls · 30d
3→ 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.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Last called 2026-08-27 18:42Z
—
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/kegfr",
"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/kegfr",
"tags": [
"kegfr",
"kidney",
"creatinine",
"gfr",
"aki"
],
"mimeType": "application/json",
"description": "Chen 2013 kinetic eGFR (KeGFR) from two plasma creatinines, hours between them, caller-assigned steady-state creatinine and corresponding eGFR/CrCl, and required max_delta_pcr_mg_dl_day (Chen usual default 1.5). KeGFR = (SSPCr * CrCl / MeanPCr) * (1 - 24*dPCr / (dTime_hours * MaxdPCr/Day)), clamped at 0 when that (1 - ratio) term is negative. Creatinine mg/dL only. Not a CKD-EPI result. Not a dialysis prescription. magent does not compute MDRD or CKD-EPI.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"delta_hours": 24,
"steady_state_egfr": 90,
"creatinine_1_mg_dl": 1,
"creatinine_2_mg_dl": 1,
"max_delta_pcr_mg_dl_day": 1.5,
"steady_state_creatinine_mg_dl": 1
}
},
"output": {
"type": "json",
"example": {
"units": "mL/min",
"formula": "kegfr",
"citation": {
"id": "chen-2013",
"doi": "10.1681/ASN.2012070653",
"pmid": "23704286",
"title": "Retooling the Creatinine Clearance Equation to Estimate Kinetic GFR when the Plasma Creatinine Is Changing Acutely",
"source": "J Am Soc Nephrol. 2013;24(6):877-888",
"authors": "Chen S"
},
"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.",
"delta_hours": 24,
"kegfr_ml_min": 90,
"mean_pcr_mg_dl": 1,
"delta_pcr_mg_dl": 0,
"steady_state_egfr": 90,
"creatinine_1_mg_dl": 1,
"creatinine_2_mg_dl": 1,
"formula_expression": "kegfr_ml_min = (steady_state_creatinine_mg_dl * steady_state_egfr / mean_pcr_mg_dl) * (1 - (24 * delta_pcr_mg_dl) / (delta_hours * max_delta_pcr_mg_dl_day)); mean_pcr_mg_dl = (creatinine_1_mg_dl + creatinine_2_mg_dl) / 2; delta_pcr_mg_dl = creatinine_2_mg_dl - creatinine_1_mg_dl; clamp kegfr_ml_min at 0 when (1 - ratio) is negative (Chen 2013)",
"max_delta_pcr_mg_dl_day": 1.5,
"steady_state_creatinine_mg_dl": 1
}
},
"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": [
"creatinine_1_mg_dl",
"creatinine_2_mg_dl",
"delta_hours",
"steady_state_creatinine_mg_dl",
"steady_state_egfr",
"max_delta_pcr_mg_dl_day"
],
"properties": {
"delta_hours": {
"type": "number",
"description": "Hours between creatinine_1 and creatinine_2 (1-72). Chen: endpoints <48-72 h apart."
},
"steady_state_egfr": {
"type": "number",
"description": "Caller-assigned eGFR/CrCl in mL/min corresponding to steady_state_creatinine_mg_dl (5-200). magent does not compute MDRD or CKD-EPI."
},
"creatinine_1_mg_dl": {
"type": "number",
"description": "First plasma creatinine in mg/dL (0.1-20). mg/dL only."
},
"creatinine_2_mg_dl": {
"type": "number",
"description": "Second plasma creatinine in mg/dL (0.1-20). mg/dL only."
},
"max_delta_pcr_mg_dl_day": {
"type": "number",
"description": "Maximum creatinine rise per day in mg/dL (0.5-3). Chen usual default 1.5. Required; magent does not omit it."
},
"steady_state_creatinine_mg_dl": {
"type": "number",
"description": "Steady-state plasma creatinine in mg/dL (0.1-20) corresponding to steady_state_egfr. mg/dL only."
}
}
}
},
"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/kegfr",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"delta_hours": 24,
"steady_state_egfr": 90,
"creatinine_1_mg_dl": 1,
"creatinine_2_mg_dl": 1,
"max_delta_pcr_mg_dl_day": 1.5,
"steady_state_creatinine_mg_dl": 1
},
{
"delta_hours": 24,
"steady_state_egfr": 90,
"creatinine_1_mg_dl": 1,
"creatinine_2_mg_dl": 1,
"max_delta_pcr_mg_dl_day": 1.5,
"steady_state_creatinine_mg_dl": 1
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/kegfr",
"count": 2,
"items": [
{
"units": "mL/min",
"formula": "kegfr",
"citation": {
"id": "chen-2013",
"doi": "10.1681/ASN.2012070653",
"pmid": "23704286",
"title": "Retooling the Creatinine Clearance Equation to Estimate Kinetic GFR when the Plasma Creatinine Is Changing Acutely",
"source": "J Am Soc Nephrol. 2013;24(6):877-888",
"authors": "Chen S"
},
"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.",
"delta_hours": 24,
"kegfr_ml_min": 90,
"mean_pcr_mg_dl": 1,
"delta_pcr_mg_dl": 0,
"steady_state_egfr": 90,
"creatinine_1_mg_dl": 1,
"creatinine_2_mg_dl": 1,
"formula_expression": "kegfr_ml_min = (steady_state_creatinine_mg_dl * steady_state_egfr / mean_pcr_mg_dl) * (1 - (24 * delta_pcr_mg_dl) / (delta_hours * max_delta_pcr_mg_dl_day)); mean_pcr_mg_dl = (creatinine_1_mg_dl + creatinine_2_mg_dl) / 2; delta_pcr_mg_dl = creatinine_2_mg_dl - creatinine_1_mg_dl; clamp kegfr_ml_min at 0 when (1 - ratio) is negative (Chen 2013)",
"max_delta_pcr_mg_dl_day": 1.5,
"steady_state_creatinine_mg_dl": 1
},
{
"units": "mL/min",
"formula": "kegfr",
"citation": {
"id": "chen-2013",
"doi": "10.1681/ASN.2012070653",
"pmid": "23704286",
"title": "Retooling the Creatinine Clearance Equation to Estimate Kinetic GFR when the Plasma Creatinine Is Changing Acutely",
"source": "J Am Soc Nephrol. 2013;24(6):877-888",
"authors": "Chen S"
},
"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.",
"delta_hours": 24,
"kegfr_ml_min": 90,
"mean_pcr_mg_dl": 1,
"delta_pcr_mg_dl": 0,
"steady_state_egfr": 90,
"creatinine_1_mg_dl": 1,
"creatinine_2_mg_dl": 1,
"formula_expression": "kegfr_ml_min = (steady_state_creatinine_mg_dl * steady_state_egfr / mean_pcr_mg_dl) * (1 - (24 * delta_pcr_mg_dl) / (delta_hours * max_delta_pcr_mg_dl_day)); mean_pcr_mg_dl = (creatinine_1_mg_dl + creatinine_2_mg_dl) / 2; delta_pcr_mg_dl = creatinine_2_mg_dl - creatinine_1_mg_dl; clamp kegfr_ml_min at 0 when (1 - ratio) is negative (Chen 2013)",
"max_delta_pcr_mg_dl_day": 1.5,
"steady_state_creatinine_mg_dl": 1
}
]
}
},
"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": [
"creatinine_1_mg_dl",
"creatinine_2_mg_dl",
"delta_hours",
"steady_state_creatinine_mg_dl",
"steady_state_egfr",
"max_delta_pcr_mg_dl_day"
],
"properties": {
"delta_hours": {
"type": "number",
"description": "Hours between creatinine_1 and creatinine_2 (1-72). Chen: endpoints <48-72 h apart."
},
"steady_state_egfr": {
"type": "number",
"description": "Caller-assigned eGFR/CrCl in mL/min corresponding to steady_state_creatinine_mg_dl (5-200). magent does not compute MDRD or CKD-EPI."
},
"creatinine_1_mg_dl": {
"type": "number",
"description": "First plasma creatinine in mg/dL (0.1-20). mg/dL only."
},
"creatinine_2_mg_dl": {
"type": "number",
"description": "Second plasma creatinine in mg/dL (0.1-20). mg/dL only."
},
"max_delta_pcr_mg_dl_day": {
"type": "number",
"description": "Maximum creatinine rise per day in mg/dL (0.5-3). Chen usual default 1.5. Required; magent does not omit it."
},
"steady_state_creatinine_mg_dl": {
"type": "number",
"description": "Steady-state plasma creatinine in mg/dL (0.1-20) corresponding to steady_state_egfr. mg/dL only."
}
}
},
"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 12:58Z
- Last indexed by Roundhouse
- 2026-09-07 08:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-13 08:15Z
- 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/kegfr, 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.