magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
SearchLiveeip155:8453Exactvia cdp
Rome-iv-child-constipationChild-constipationGiRome-ivH3a
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 2026-09-01 05:31Z
—
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/rome_iv_child_constipation",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
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"version": "2",
"withdrawDelay": 86400,
"receiverAuthorizer": "0x3721824a31197dcDD2984cF43b92B6cc8A87c0Fb",
"assetTransferMethod": "eip3009"
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"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "batch-settlement",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
],
"resource": {
"url": "https://api.magentlab.com/api/calc/rome_iv_child_constipation",
"tags": [
"rome-iv-child-constipation",
"child-constipation",
"gi",
"rome-iv",
"h3a"
],
"mimeType": "application/json",
"description": "Hyams 2016 Rome IV H3a. rome_iv_child_constipation is true iff developmental_age_at_least_4_years, duration_at_least_1_month, features_met >= 2, insufficient_criteria_for_ibs, and not_explained_by_another_condition. features_met always counts all six H3a flags (no G7 toilet-trained extras). Weekly frequency is folded into those flags. Caller assigns flags including large_fecal_mass_in_rectum. magent does not examine the child. Not a diagnosis, not infant G7, not adult Rome IV FC.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"duration_at_least_1_month": true,
"large_fecal_mass_in_rectum": false,
"insufficient_criteria_for_ibs": true,
"painful_or_hard_bowel_movements": true,
"developmental_age_at_least_4_years": true,
"fecal_incontinence_at_least_weekly": false,
"not_explained_by_another_condition": true,
"two_or_fewer_defecations_in_toilet_per_week": true,
"large_diameter_stools_that_can_obstruct_toilet": false,
"retentive_posturing_or_excessive_volitional_stool_retention": false
}
},
"output": {
"type": "json",
"example": {
"formula": "rome_iv_child_constipation",
"citation": {
"id": "hyams-2016",
"doi": "10.1053/j.gastro.2016.02.015",
"pmid": "27144632",
"title": "Childhood Functional Gastrointestinal Disorders: Child/Adolescent",
"source": "Gastroenterology. 2016;150(6):1456-1468",
"authors": "Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M"
},
"criteria": [
{
"met": true,
"factor": "developmental_age_at_least_4_years"
},
{
"met": true,
"factor": "two_or_fewer_defecations_in_toilet_per_week"
},
{
"met": false,
"factor": "fecal_incontinence_at_least_weekly"
},
{
"met": false,
"factor": "retentive_posturing_or_excessive_volitional_stool_retention"
},
{
"met": true,
"factor": "painful_or_hard_bowel_movements"
},
{
"met": false,
"factor": "large_fecal_mass_in_rectum"
},
{
"met": false,
"factor": "large_diameter_stools_that_can_obstruct_toilet"
},
{
"met": true,
"factor": "duration_at_least_1_month"
},
{
"met": true,
"value": 2,
"factor": "features_ge_2"
},
{
"met": true,
"factor": "insufficient_criteria_for_ibs"
},
{
"met": true,
"factor": "not_explained_by_another_condition"
}
],
"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.",
"features_met": 2,
"formula_expression": "rome_iv_child_constipation iff developmental_age_at_least_4_years and duration_at_least_1_month and features_met >= 2 and insufficient_criteria_for_ibs and not_explained_by_another_condition; features_met always counts two_or_fewer_defecations_in_toilet_per_week, fecal_incontinence_at_least_weekly, retentive_posturing_or_excessive_volitional_stool_retention, painful_or_hard_bowel_movements, large_fecal_mass_in_rectum, and large_diameter_stools_that_can_obstruct_toilet (Hyams 2016 Rome IV H3a Functional Constipation)",
"rome_iv_child_constipation": true
}
},
"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": [
"developmental_age_at_least_4_years",
"two_or_fewer_defecations_in_toilet_per_week",
"fecal_incontinence_at_least_weekly",
"retentive_posturing_or_excessive_volitional_stool_retention",
"painful_or_hard_bowel_movements",
"large_fecal_mass_in_rectum",
"large_diameter_stools_that_can_obstruct_toilet",
"duration_at_least_1_month",
"insufficient_criteria_for_ibs",
"not_explained_by_another_condition"
],
"properties": {
"duration_at_least_1_month": {
"type": "boolean",
"description": "Must include 1 month of at least 2 features occurring at least once per week, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child."
},
"large_fecal_mass_in_rectum": {
"type": "boolean",
"description": "Presence of a large fecal mass in the rectum, as assigned (Hyams 2016 Rome IV H3a; one of six features; digital rectal exam is caller-assigned). true or false as assigned by the caller. magent does not examine the child."
},
"insufficient_criteria_for_ibs": {
"type": "boolean",
"description": "Insufficient criteria for irritable bowel syndrome, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child."
},
"painful_or_hard_bowel_movements": {
"type": "boolean",
"description": "History of painful or hard bowel movements, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"developmental_age_at_least_4_years": {
"type": "boolean",
"description": "Developmental age at least 4 years, as assigned (Hyams 2016 Rome IV H3a child/adolescent). true or false as assigned by the caller. magent does not examine the child."
},
"fecal_incontinence_at_least_weekly": {
"type": "boolean",
"description": "At least one episode of fecal incontinence per week, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"not_explained_by_another_condition": {
"type": "boolean",
"description": "After appropriate evaluation, the symptoms cannot be fully explained by another medical condition, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child."
},
"two_or_fewer_defecations_in_toilet_per_week": {
"type": "boolean",
"description": "Two or fewer defecations in the toilet per week, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"large_diameter_stools_that_can_obstruct_toilet": {
"type": "boolean",
"description": "History of large-diameter stools that can obstruct the toilet, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"retentive_posturing_or_excessive_volitional_stool_retention": {
"type": "boolean",
"description": "History of retentive posturing or excessive volitional stool retention, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
}
}
}
},
"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/rome_iv_child_constipation",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"duration_at_least_1_month": true,
"large_fecal_mass_in_rectum": false,
"insufficient_criteria_for_ibs": true,
"painful_or_hard_bowel_movements": true,
"developmental_age_at_least_4_years": true,
"fecal_incontinence_at_least_weekly": false,
"not_explained_by_another_condition": true,
"two_or_fewer_defecations_in_toilet_per_week": true,
"large_diameter_stools_that_can_obstruct_toilet": false,
"retentive_posturing_or_excessive_volitional_stool_retention": false
},
{
"duration_at_least_1_month": true,
"large_fecal_mass_in_rectum": false,
"insufficient_criteria_for_ibs": true,
"painful_or_hard_bowel_movements": true,
"developmental_age_at_least_4_years": true,
"fecal_incontinence_at_least_weekly": false,
"not_explained_by_another_condition": true,
"two_or_fewer_defecations_in_toilet_per_week": true,
"large_diameter_stools_that_can_obstruct_toilet": false,
"retentive_posturing_or_excessive_volitional_stool_retention": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/rome_iv_child_constipation",
"count": 2,
"items": [
{
"formula": "rome_iv_child_constipation",
"citation": {
"id": "hyams-2016",
"doi": "10.1053/j.gastro.2016.02.015",
"pmid": "27144632",
"title": "Childhood Functional Gastrointestinal Disorders: Child/Adolescent",
"source": "Gastroenterology. 2016;150(6):1456-1468",
"authors": "Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M"
},
"criteria": [
{
"met": true,
"factor": "developmental_age_at_least_4_years"
},
{
"met": true,
"factor": "two_or_fewer_defecations_in_toilet_per_week"
},
{
"met": false,
"factor": "fecal_incontinence_at_least_weekly"
},
{
"met": false,
"factor": "retentive_posturing_or_excessive_volitional_stool_retention"
},
{
"met": true,
"factor": "painful_or_hard_bowel_movements"
},
{
"met": false,
"factor": "large_fecal_mass_in_rectum"
},
{
"met": false,
"factor": "large_diameter_stools_that_can_obstruct_toilet"
},
{
"met": true,
"factor": "duration_at_least_1_month"
},
{
"met": true,
"value": 2,
"factor": "features_ge_2"
},
{
"met": true,
"factor": "insufficient_criteria_for_ibs"
},
{
"met": true,
"factor": "not_explained_by_another_condition"
}
],
"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.",
"features_met": 2,
"formula_expression": "rome_iv_child_constipation iff developmental_age_at_least_4_years and duration_at_least_1_month and features_met >= 2 and insufficient_criteria_for_ibs and not_explained_by_another_condition; features_met always counts two_or_fewer_defecations_in_toilet_per_week, fecal_incontinence_at_least_weekly, retentive_posturing_or_excessive_volitional_stool_retention, painful_or_hard_bowel_movements, large_fecal_mass_in_rectum, and large_diameter_stools_that_can_obstruct_toilet (Hyams 2016 Rome IV H3a Functional Constipation)",
"rome_iv_child_constipation": true
},
{
"formula": "rome_iv_child_constipation",
"citation": {
"id": "hyams-2016",
"doi": "10.1053/j.gastro.2016.02.015",
"pmid": "27144632",
"title": "Childhood Functional Gastrointestinal Disorders: Child/Adolescent",
"source": "Gastroenterology. 2016;150(6):1456-1468",
"authors": "Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M"
},
"criteria": [
{
"met": true,
"factor": "developmental_age_at_least_4_years"
},
{
"met": true,
"factor": "two_or_fewer_defecations_in_toilet_per_week"
},
{
"met": false,
"factor": "fecal_incontinence_at_least_weekly"
},
{
"met": false,
"factor": "retentive_posturing_or_excessive_volitional_stool_retention"
},
{
"met": true,
"factor": "painful_or_hard_bowel_movements"
},
{
"met": false,
"factor": "large_fecal_mass_in_rectum"
},
{
"met": false,
"factor": "large_diameter_stools_that_can_obstruct_toilet"
},
{
"met": true,
"factor": "duration_at_least_1_month"
},
{
"met": true,
"value": 2,
"factor": "features_ge_2"
},
{
"met": true,
"factor": "insufficient_criteria_for_ibs"
},
{
"met": true,
"factor": "not_explained_by_another_condition"
}
],
"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.",
"features_met": 2,
"formula_expression": "rome_iv_child_constipation iff developmental_age_at_least_4_years and duration_at_least_1_month and features_met >= 2 and insufficient_criteria_for_ibs and not_explained_by_another_condition; features_met always counts two_or_fewer_defecations_in_toilet_per_week, fecal_incontinence_at_least_weekly, retentive_posturing_or_excessive_volitional_stool_retention, painful_or_hard_bowel_movements, large_fecal_mass_in_rectum, and large_diameter_stools_that_can_obstruct_toilet (Hyams 2016 Rome IV H3a Functional Constipation)",
"rome_iv_child_constipation": true
}
]
}
},
"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": [
"developmental_age_at_least_4_years",
"two_or_fewer_defecations_in_toilet_per_week",
"fecal_incontinence_at_least_weekly",
"retentive_posturing_or_excessive_volitional_stool_retention",
"painful_or_hard_bowel_movements",
"large_fecal_mass_in_rectum",
"large_diameter_stools_that_can_obstruct_toilet",
"duration_at_least_1_month",
"insufficient_criteria_for_ibs",
"not_explained_by_another_condition"
],
"properties": {
"duration_at_least_1_month": {
"type": "boolean",
"description": "Must include 1 month of at least 2 features occurring at least once per week, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child."
},
"large_fecal_mass_in_rectum": {
"type": "boolean",
"description": "Presence of a large fecal mass in the rectum, as assigned (Hyams 2016 Rome IV H3a; one of six features; digital rectal exam is caller-assigned). true or false as assigned by the caller. magent does not examine the child."
},
"insufficient_criteria_for_ibs": {
"type": "boolean",
"description": "Insufficient criteria for irritable bowel syndrome, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child."
},
"painful_or_hard_bowel_movements": {
"type": "boolean",
"description": "History of painful or hard bowel movements, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"developmental_age_at_least_4_years": {
"type": "boolean",
"description": "Developmental age at least 4 years, as assigned (Hyams 2016 Rome IV H3a child/adolescent). true or false as assigned by the caller. magent does not examine the child."
},
"fecal_incontinence_at_least_weekly": {
"type": "boolean",
"description": "At least one episode of fecal incontinence per week, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"not_explained_by_another_condition": {
"type": "boolean",
"description": "After appropriate evaluation, the symptoms cannot be fully explained by another medical condition, as assigned (Hyams 2016 Rome IV H3a). true or false as assigned by the caller. magent does not examine the child."
},
"two_or_fewer_defecations_in_toilet_per_week": {
"type": "boolean",
"description": "Two or fewer defecations in the toilet per week, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"large_diameter_stools_that_can_obstruct_toilet": {
"type": "boolean",
"description": "History of large-diameter stools that can obstruct the toilet, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
},
"retentive_posturing_or_excessive_volitional_stool_retention": {
"type": "boolean",
"description": "History of retentive posturing or excessive volitional stool retention, as assigned (Hyams 2016 Rome IV H3a; one of six features; weekly frequency is folded into this flag). true or false as assigned by the caller. magent does not examine the child."
}
}
},
"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
- 2026-09-01 05:31Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 02:45Z
- 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/rome_iv_child_constipation, 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.