magent
Grobman 2007 first prenatal visit logistic probability of vaginal birth after cesarean from maternal age, prepregnancy BMI, caller-assigned ethnicity (african_american, hispanic, or other), any prior vaginal delivery, prior VBAC after cesarean, and recurrent cesarean indication. Ethnicity uses the paper terms; magent does not assign race or ethnicity. Not the 2009/2010 admission model and not Grobman 2021. Not a trial-of-labor order.
Inferenceofflineeip155:8453Exactvia cdp
Grobman-vbacVbacTolacObstetricsCalculator
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 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 2026-09-04 03:50Z
—
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/grobman_vbac",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
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"withdrawDelay": 86400,
"receiverAuthorizer": "0x3721824a31197dcDD2984cF43b92B6cc8A87c0Fb",
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"amount": "5000",
"scheme": "batch-settlement",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
],
"resource": {
"url": "https://api.magentlab.com/api/calc/grobman_vbac",
"tags": [
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"vbac",
"tolac",
"obstetrics",
"calculator"
],
"mimeType": "application/json",
"description": "Grobman 2007 first prenatal visit logistic probability of vaginal birth after cesarean from maternal age, prepregnancy BMI, caller-assigned ethnicity (african_american, hispanic, or other), any prior vaginal delivery, prior VBAC after cesarean, and recurrent cesarean indication. Ethnicity uses the paper terms; magent does not assign race or ethnicity. Not the 2009/2010 admission model and not Grobman 2021. Not a trial-of-labor order.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
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"method": "GET",
"queryParams": {
"age": 30,
"bmi_kg_m2": 25,
"ethnicity": "other",
"prior_vbac": false,
"prior_vaginal": false,
"recurrent_indication": false
}
},
"output": {
"type": "json",
"example": {
"formula": "grobman_vbac",
"citation": {
"id": "grobman-2007-vbac",
"doi": "10.1097/01.AOG.0000259312.36053.02",
"pmid": "17400840",
"title": "Development of a nomogram for prediction of vaginal birth after cesarean delivery",
"source": "Obstet Gynecol. 2007;109(4):806-812",
"authors": "Grobman WA, Lai Y, Landon MB, Spong CY, Leveno KJ, Rouse DJ, Varner MW, Moawad AH, Caritis SN, Harper M, Wapner RJ, Sorokin Y, Miodovnik M, Carpenter M, Peaceman AM, O'Sullivan MJ, Sibai BM, Langer O, Thorp JM, Ramin SM, Mercer BM; National Institute of Child Health and Human Development (NICHD) Maternal-Fetal Medicine Units Network (MFMU)"
},
"age_years": 30,
"bmi_kg_m2": 25,
"ethnicity": "other",
"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.",
"prior_vbac": false,
"prior_vaginal": false,
"linear_predictor": 1.096,
"vbac_probability": 0.75,
"formula_expression": "w = 3.766 - 0.039*age_years - 0.060*prepregnancy_bmi - 0.671*[african_american] - 0.680*[hispanic] + 0.888*[any prior vaginal delivery] + 1.003*[VBAC after prior cesarean] - 0.632*[recurring indication for cesarean]; vbac_probability = exp(w)/(1+exp(w)); ethnicity african_american|hispanic|other (caller-assigned Grobman 2007 terms, mutually exclusive; other is the reference; magent does not assign race or ethnicity); flags 1 if true else 0; first prenatal visit model; round linear_predictor and vbac_probability 3 decimals; not Grobman 2009/2010 admission; not Grobman 2021 race-free; not a TOLAC order",
"recurrent_indication": 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": [
"age",
"bmi_kg_m2",
"ethnicity",
"prior_vaginal",
"prior_vbac",
"recurrent_indication"
],
"properties": {
"age": {
"type": "integer",
"description": "Maternal age in years (integer 12-55). Grobman 2007 coefficient -0.039 per year. 12-55 is a clinical range for TOLAC; the paper does not print that clamp. magent does not take a date of birth."
},
"bmi_kg_m2": {
"type": "number",
"description": "Prepregnancy BMI in kg/m^2 (15-70). Grobman 2007 coefficient -0.060. 15-70 is a clinical range; the paper does not print that clamp. Caller-supplied; magent does not compute BMI from height and weight."
},
"ethnicity": {
"enum": [
"african_american",
"hispanic",
"other"
],
"type": "string",
"description": "Caller-assigned ethnicity as used in Grobman 2007: african_american, hispanic, or other (mutually exclusive paper terms; other is the reference). magent does not assign race or ethnicity."
},
"prior_vbac": {
"type": "boolean",
"description": "VBAC after prior cesarean as assigned by the caller (Grobman 2007). true scores +1.003. true or false. magent does not infer this from prior_vaginal."
},
"prior_vaginal": {
"type": "boolean",
"description": "Any prior vaginal delivery as assigned by the caller (Grobman 2007). true scores +0.888. true or false. magent does not read the obstetric history."
},
"recurrent_indication": {
"type": "boolean",
"description": "Recurring indication for cesarean as assigned by the caller (Grobman 2007). true scores -0.632. true or false. magent does not read the operative indication."
}
}
}
},
"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/grobman_vbac",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 30,
"bmi_kg_m2": 25,
"ethnicity": "other",
"prior_vbac": false,
"prior_vaginal": false,
"recurrent_indication": false
},
{
"age": 30,
"bmi_kg_m2": 25,
"ethnicity": "other",
"prior_vbac": false,
"prior_vaginal": false,
"recurrent_indication": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/grobman_vbac",
"count": 2,
"items": [
{
"formula": "grobman_vbac",
"citation": {
"id": "grobman-2007-vbac",
"doi": "10.1097/01.AOG.0000259312.36053.02",
"pmid": "17400840",
"title": "Development of a nomogram for prediction of vaginal birth after cesarean delivery",
"source": "Obstet Gynecol. 2007;109(4):806-812",
"authors": "Grobman WA, Lai Y, Landon MB, Spong CY, Leveno KJ, Rouse DJ, Varner MW, Moawad AH, Caritis SN, Harper M, Wapner RJ, Sorokin Y, Miodovnik M, Carpenter M, Peaceman AM, O'Sullivan MJ, Sibai BM, Langer O, Thorp JM, Ramin SM, Mercer BM; National Institute of Child Health and Human Development (NICHD) Maternal-Fetal Medicine Units Network (MFMU)"
},
"age_years": 30,
"bmi_kg_m2": 25,
"ethnicity": "other",
"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.",
"prior_vbac": false,
"prior_vaginal": false,
"linear_predictor": 1.096,
"vbac_probability": 0.75,
"formula_expression": "w = 3.766 - 0.039*age_years - 0.060*prepregnancy_bmi - 0.671*[african_american] - 0.680*[hispanic] + 0.888*[any prior vaginal delivery] + 1.003*[VBAC after prior cesarean] - 0.632*[recurring indication for cesarean]; vbac_probability = exp(w)/(1+exp(w)); ethnicity african_american|hispanic|other (caller-assigned Grobman 2007 terms, mutually exclusive; other is the reference; magent does not assign race or ethnicity); flags 1 if true else 0; first prenatal visit model; round linear_predictor and vbac_probability 3 decimals; not Grobman 2009/2010 admission; not Grobman 2021 race-free; not a TOLAC order",
"recurrent_indication": false
},
{
"formula": "grobman_vbac",
"citation": {
"id": "grobman-2007-vbac",
"doi": "10.1097/01.AOG.0000259312.36053.02",
"pmid": "17400840",
"title": "Development of a nomogram for prediction of vaginal birth after cesarean delivery",
"source": "Obstet Gynecol. 2007;109(4):806-812",
"authors": "Grobman WA, Lai Y, Landon MB, Spong CY, Leveno KJ, Rouse DJ, Varner MW, Moawad AH, Caritis SN, Harper M, Wapner RJ, Sorokin Y, Miodovnik M, Carpenter M, Peaceman AM, O'Sullivan MJ, Sibai BM, Langer O, Thorp JM, Ramin SM, Mercer BM; National Institute of Child Health and Human Development (NICHD) Maternal-Fetal Medicine Units Network (MFMU)"
},
"age_years": 30,
"bmi_kg_m2": 25,
"ethnicity": "other",
"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.",
"prior_vbac": false,
"prior_vaginal": false,
"linear_predictor": 1.096,
"vbac_probability": 0.75,
"formula_expression": "w = 3.766 - 0.039*age_years - 0.060*prepregnancy_bmi - 0.671*[african_american] - 0.680*[hispanic] + 0.888*[any prior vaginal delivery] + 1.003*[VBAC after prior cesarean] - 0.632*[recurring indication for cesarean]; vbac_probability = exp(w)/(1+exp(w)); ethnicity african_american|hispanic|other (caller-assigned Grobman 2007 terms, mutually exclusive; other is the reference; magent does not assign race or ethnicity); flags 1 if true else 0; first prenatal visit model; round linear_predictor and vbac_probability 3 decimals; not Grobman 2009/2010 admission; not Grobman 2021 race-free; not a TOLAC order",
"recurrent_indication": 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": [
"age",
"bmi_kg_m2",
"ethnicity",
"prior_vaginal",
"prior_vbac",
"recurrent_indication"
],
"properties": {
"age": {
"type": "integer",
"description": "Maternal age in years (integer 12-55). Grobman 2007 coefficient -0.039 per year. 12-55 is a clinical range for TOLAC; the paper does not print that clamp. magent does not take a date of birth."
},
"bmi_kg_m2": {
"type": "number",
"description": "Prepregnancy BMI in kg/m^2 (15-70). Grobman 2007 coefficient -0.060. 15-70 is a clinical range; the paper does not print that clamp. Caller-supplied; magent does not compute BMI from height and weight."
},
"ethnicity": {
"enum": [
"african_american",
"hispanic",
"other"
],
"type": "string",
"description": "Caller-assigned ethnicity as used in Grobman 2007: african_american, hispanic, or other (mutually exclusive paper terms; other is the reference). magent does not assign race or ethnicity."
},
"prior_vbac": {
"type": "boolean",
"description": "VBAC after prior cesarean as assigned by the caller (Grobman 2007). true scores +1.003. true or false. magent does not infer this from prior_vaginal."
},
"prior_vaginal": {
"type": "boolean",
"description": "Any prior vaginal delivery as assigned by the caller (Grobman 2007). true scores +0.888. true or false. magent does not read the obstetric history."
},
"recurrent_indication": {
"type": "boolean",
"description": "Recurring indication for cesarean as assigned by the caller (Grobman 2007). true scores -0.632. true or false. magent does not read the operative indication."
}
}
},
"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
- 2026-09-04 03:50Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-12 15:45Z
- 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. 5 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/grobman_vbac, 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.