magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
OtherLiveeip155:8453Exactvia cdp
Ckid-u25PediatricKidneyEgfrCalculator
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 19:25Z
—
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/ckid_u25",
"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/ckid_u25",
"tags": [
"ckid-u25",
"pediatric",
"kidney",
"egfr",
"calculator"
],
"mimeType": "application/json",
"description": "CKiD U25 eGFR (Pierce 2021) for ages 1-25: age- and sex-dependent K times height in meters over creatinine (mg/dL), or K over cystatin C (mg/L), or the average of both when both markers are given. Height may be cm or inches; creatinine may be mg/dL or µmol/L. Not the Schwartz 2009 bedside 0.413 formula, not a drug dose, and not a CKD stage. Not a medical device.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"sex": "male",
"age_years": 10,
"height_cm": 140,
"height_in": 55.1181,
"cystatin_c_mg_l": 1,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.42
}
},
"output": {
"type": "json",
"example": {
"sex": "male",
"k_cr": 38.3834,
"units": "mL/min/1.73m2",
"formula": "ckid_u25_cr",
"citation": {
"id": "pierce-2021-ckid-u25",
"doi": "10.1016/j.kint.2020.10.047",
"pmid": "33301749",
"title": "Age- and sex-dependent clinical equations to estimate glomerular filtration rates in children and young adults with chronic kidney disease",
"source": "Kidney Int. 2021;99(4):948-956",
"authors": "Pierce CB, Muñoz A, Ng DK, Warady BA, Furth SL, Schwartz GJ"
},
"age_years": 10,
"height_cm": 140,
"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.",
"creatinine_mg_dl": 1,
"egfr_ml_min_1_73m2": 53.7,
"formula_expression": "egfr_cr = K_cr * (height_m / creatinine_mg_dl); egfr_cys = K_cys * (1 / cystatin_c_mg_l); combined = (egfr_cr + egfr_cys) / 2 when both markers; K_cr and K_cys are Pierce 2021 Table 2 age-dependent (not constant-K models); height in meters; ages 1-25"
}
},
"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",
"sex"
],
"properties": {
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Sex used by Pierce 2021 Table 2 K. female or male."
},
"age_years": {
"type": "number",
"description": "Age in years (1-25, fractional ages allowed). Pierce 2021 CKiD U25 age-dependent K is evaluated at that age. Not the adult 18-120 clamp."
},
"height_cm": {
"type": "number",
"description": "Height in centimeters (50-250). Required with creatinine for the creatinine or combined path. Converted to meters in the equation. Provide height_cm or height_in. Not required for cystatin-only."
},
"height_in": {
"type": "number",
"description": "Height in inches (20-98). Converted as cm = in * 2.54."
},
"cystatin_c_mg_l": {
"type": "number",
"description": "Serum cystatin C in mg/L (0.2-10). Required for the cystatin-only or combined path. Height is not required when this is the only marker."
},
"creatinine_mg_dl": {
"type": "number",
"description": "Serum creatinine in mg/dL (0.1-20). Required with height for the creatinine or combined path. Provide this or creatinine_umol_l."
},
"creatinine_umol_l": {
"type": "number",
"description": "Serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42."
}
}
}
},
"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/ckid_u25",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"sex": "male",
"age_years": 10,
"height_cm": 140,
"height_in": 55.1181,
"cystatin_c_mg_l": 1,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.42
},
{
"sex": "male",
"age_years": 10,
"height_cm": 140,
"height_in": 55.1181,
"cystatin_c_mg_l": 1,
"creatinine_mg_dl": 1,
"creatinine_umol_l": 88.42
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/ckid_u25",
"count": 2,
"items": [
{
"sex": "male",
"k_cr": 38.3834,
"units": "mL/min/1.73m2",
"formula": "ckid_u25_cr",
"citation": {
"id": "pierce-2021-ckid-u25",
"doi": "10.1016/j.kint.2020.10.047",
"pmid": "33301749",
"title": "Age- and sex-dependent clinical equations to estimate glomerular filtration rates in children and young adults with chronic kidney disease",
"source": "Kidney Int. 2021;99(4):948-956",
"authors": "Pierce CB, Muñoz A, Ng DK, Warady BA, Furth SL, Schwartz GJ"
},
"age_years": 10,
"height_cm": 140,
"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.",
"creatinine_mg_dl": 1,
"egfr_ml_min_1_73m2": 53.7,
"formula_expression": "egfr_cr = K_cr * (height_m / creatinine_mg_dl); egfr_cys = K_cys * (1 / cystatin_c_mg_l); combined = (egfr_cr + egfr_cys) / 2 when both markers; K_cr and K_cys are Pierce 2021 Table 2 age-dependent (not constant-K models); height in meters; ages 1-25"
},
{
"sex": "male",
"k_cr": 38.3834,
"units": "mL/min/1.73m2",
"formula": "ckid_u25_cr",
"citation": {
"id": "pierce-2021-ckid-u25",
"doi": "10.1016/j.kint.2020.10.047",
"pmid": "33301749",
"title": "Age- and sex-dependent clinical equations to estimate glomerular filtration rates in children and young adults with chronic kidney disease",
"source": "Kidney Int. 2021;99(4):948-956",
"authors": "Pierce CB, Muñoz A, Ng DK, Warady BA, Furth SL, Schwartz GJ"
},
"age_years": 10,
"height_cm": 140,
"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.",
"creatinine_mg_dl": 1,
"egfr_ml_min_1_73m2": 53.7,
"formula_expression": "egfr_cr = K_cr * (height_m / creatinine_mg_dl); egfr_cys = K_cys * (1 / cystatin_c_mg_l); combined = (egfr_cr + egfr_cys) / 2 when both markers; K_cr and K_cys are Pierce 2021 Table 2 age-dependent (not constant-K models); height in meters; ages 1-25"
}
]
}
},
"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",
"sex"
],
"properties": {
"sex": {
"enum": [
"female",
"male"
],
"type": "string",
"description": "Sex used by Pierce 2021 Table 2 K. female or male."
},
"age_years": {
"type": "number",
"description": "Age in years (1-25, fractional ages allowed). Pierce 2021 CKiD U25 age-dependent K is evaluated at that age. Not the adult 18-120 clamp."
},
"height_cm": {
"type": "number",
"description": "Height in centimeters (50-250). Required with creatinine for the creatinine or combined path. Converted to meters in the equation. Provide height_cm or height_in. Not required for cystatin-only."
},
"height_in": {
"type": "number",
"description": "Height in inches (20-98). Converted as cm = in * 2.54."
},
"cystatin_c_mg_l": {
"type": "number",
"description": "Serum cystatin C in mg/L (0.2-10). Required for the cystatin-only or combined path. Height is not required when this is the only marker."
},
"creatinine_mg_dl": {
"type": "number",
"description": "Serum creatinine in mg/dL (0.1-20). Required with height for the creatinine or combined path. Provide this or creatinine_umol_l."
},
"creatinine_umol_l": {
"type": "number",
"description": "Serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42."
}
}
},
"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 19:25Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 15:45Z
- 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. 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/ckid_u25, 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.