magent
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
SearchLiveeip155:8453Exactvia cdp
VexusVexus-cCongestionHemodynamicsCalculator
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 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.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-31 12:55Z
—
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/vexus",
"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/vexus",
"tags": [
"vexus",
"vexus-c",
"congestion",
"hemodynamics",
"calculator"
],
"mimeType": "application/json",
"description": "Beaubien-Souligny 2020 VExUS C only (not A, B, D, or E). Caller-assigned ivc_dilated (IVC ≥2 cm) plus hepatic, portal, and intra-renal Doppler each normal, mild, or severe. Grade 0 if the IVC is not dilated; 1 if dilated with zero severe patterns; 2 if exactly one severe; 3 if two or more are severe. magent does not perform ultrasound. Not an AKI diagnosis or a fluid-order. Not a medical device.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"renal": "normal",
"portal": "normal",
"hepatic": "normal",
"ivc_dilated": false
}
},
"output": {
"type": "json",
"example": {
"renal": "normal",
"portal": "normal",
"formula": "vexus",
"hepatic": "normal",
"citation": {
"id": "beaubien-souligny-2020",
"doi": "10.1186/s13089-020-00163-w",
"pmid": "32270297",
"title": "Quantifying systemic congestion with Point-Of-Care ultrasound: development of the venous excess ultrasound grading system",
"source": "Ultrasound J. 2020;12(1):16",
"authors": "Beaubien-Souligny W, Rola P, Haycock K, Bouchard J, Lamarche Y, Spiegel R, Denault AY"
},
"components": [
{
"met": false,
"factor": "ivc_dilated"
},
{
"met": false,
"value": "normal",
"factor": "hepatic_severe"
},
{
"met": false,
"value": "normal",
"factor": "portal_severe"
},
{
"met": false,
"value": "normal",
"factor": "renal_severe"
},
{
"met": true,
"factor": "grade_0"
},
{
"met": false,
"factor": "grade_1"
},
{
"met": false,
"factor": "grade_2"
},
{
"met": false,
"factor": "grade_3"
}
],
"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.",
"ivc_dilated": false,
"vexus_grade": 0,
"formula_expression": "VExUS C grade 0 if ivc_dilated is false (regardless of Doppler); else 1 if zero of hepatic/portal/renal are severe; 2 if exactly one is severe; 3 if two or more are severe (Beaubien-Souligny 2020 prototype C). Hepatic: normal (triphasic S>D toward liver), mild (S<D toward liver), severe (S reversed toward heart). Portal: mild pulsatility 30 to <50%, severe ≥50%. Renal: mild discontinuous S and D, severe only D. IVC dilated iff maximal diameter ≥2 cm as assigned. Not prototypes A, B, D, E",
"severe_doppler_count": 0
}
},
"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": [
"ivc_dilated",
"hepatic",
"portal",
"renal"
],
"properties": {
"renal": {
"enum": [
"normal",
"mild",
"severe"
],
"type": "string",
"description": "Intra-renal venous Doppler grade as assigned by the caller (Beaubien-Souligny 2020 Figure 1): normal (continuous flow); mild (discontinuous with a systolic and a diastolic phase); severe (discontinuous with only a diastolic phase during the cardiac cycle). magent does not perform ultrasound."
},
"portal": {
"enum": [
"normal",
"mild",
"severe"
],
"type": "string",
"description": "Portal-vein Doppler grade as assigned by the caller (Beaubien-Souligny 2020 Figure 1 caption): normal (pulsatility fraction not in the mild or severe bands); mild (velocity variation 30 to <50%); severe (variation ≥50%). magent does not perform ultrasound."
},
"hepatic": {
"enum": [
"normal",
"mild",
"severe"
],
"type": "string",
"description": "Hepatic-vein Doppler grade as assigned by the caller (Beaubien-Souligny 2020 Figure 1): normal (not mild and not severe; triphasic S > D toward the liver); mild (S component lower in magnitude than D but still toward the liver); severe (S component reversed, toward the heart). magent does not perform ultrasound."
},
"ivc_dilated": {
"type": "boolean",
"description": "Whether the IVC is dilated as assigned by the caller. Dilated iff maximal IVC diameter ≥2 cm (Beaubien-Souligny 2020). true or false. Grade 0 whenever this is false, regardless of Doppler. magent does not measure IVC."
}
}
}
},
"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/vexus",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"renal": "normal",
"portal": "normal",
"hepatic": "normal",
"ivc_dilated": false
},
{
"renal": "normal",
"portal": "normal",
"hepatic": "normal",
"ivc_dilated": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/vexus",
"count": 2,
"items": [
{
"renal": "normal",
"portal": "normal",
"formula": "vexus",
"hepatic": "normal",
"citation": {
"id": "beaubien-souligny-2020",
"doi": "10.1186/s13089-020-00163-w",
"pmid": "32270297",
"title": "Quantifying systemic congestion with Point-Of-Care ultrasound: development of the venous excess ultrasound grading system",
"source": "Ultrasound J. 2020;12(1):16",
"authors": "Beaubien-Souligny W, Rola P, Haycock K, Bouchard J, Lamarche Y, Spiegel R, Denault AY"
},
"components": [
{
"met": false,
"factor": "ivc_dilated"
},
{
"met": false,
"value": "normal",
"factor": "hepatic_severe"
},
{
"met": false,
"value": "normal",
"factor": "portal_severe"
},
{
"met": false,
"value": "normal",
"factor": "renal_severe"
},
{
"met": true,
"factor": "grade_0"
},
{
"met": false,
"factor": "grade_1"
},
{
"met": false,
"factor": "grade_2"
},
{
"met": false,
"factor": "grade_3"
}
],
"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.",
"ivc_dilated": false,
"vexus_grade": 0,
"formula_expression": "VExUS C grade 0 if ivc_dilated is false (regardless of Doppler); else 1 if zero of hepatic/portal/renal are severe; 2 if exactly one is severe; 3 if two or more are severe (Beaubien-Souligny 2020 prototype C). Hepatic: normal (triphasic S>D toward liver), mild (S<D toward liver), severe (S reversed toward heart). Portal: mild pulsatility 30 to <50%, severe ≥50%. Renal: mild discontinuous S and D, severe only D. IVC dilated iff maximal diameter ≥2 cm as assigned. Not prototypes A, B, D, E",
"severe_doppler_count": 0
},
{
"renal": "normal",
"portal": "normal",
"formula": "vexus",
"hepatic": "normal",
"citation": {
"id": "beaubien-souligny-2020",
"doi": "10.1186/s13089-020-00163-w",
"pmid": "32270297",
"title": "Quantifying systemic congestion with Point-Of-Care ultrasound: development of the venous excess ultrasound grading system",
"source": "Ultrasound J. 2020;12(1):16",
"authors": "Beaubien-Souligny W, Rola P, Haycock K, Bouchard J, Lamarche Y, Spiegel R, Denault AY"
},
"components": [
{
"met": false,
"factor": "ivc_dilated"
},
{
"met": false,
"value": "normal",
"factor": "hepatic_severe"
},
{
"met": false,
"value": "normal",
"factor": "portal_severe"
},
{
"met": false,
"value": "normal",
"factor": "renal_severe"
},
{
"met": true,
"factor": "grade_0"
},
{
"met": false,
"factor": "grade_1"
},
{
"met": false,
"factor": "grade_2"
},
{
"met": false,
"factor": "grade_3"
}
],
"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.",
"ivc_dilated": false,
"vexus_grade": 0,
"formula_expression": "VExUS C grade 0 if ivc_dilated is false (regardless of Doppler); else 1 if zero of hepatic/portal/renal are severe; 2 if exactly one is severe; 3 if two or more are severe (Beaubien-Souligny 2020 prototype C). Hepatic: normal (triphasic S>D toward liver), mild (S<D toward liver), severe (S reversed toward heart). Portal: mild pulsatility 30 to <50%, severe ≥50%. Renal: mild discontinuous S and D, severe only D. IVC dilated iff maximal diameter ≥2 cm as assigned. Not prototypes A, B, D, E",
"severe_doppler_count": 0
}
]
}
},
"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": [
"ivc_dilated",
"hepatic",
"portal",
"renal"
],
"properties": {
"renal": {
"enum": [
"normal",
"mild",
"severe"
],
"type": "string",
"description": "Intra-renal venous Doppler grade as assigned by the caller (Beaubien-Souligny 2020 Figure 1): normal (continuous flow); mild (discontinuous with a systolic and a diastolic phase); severe (discontinuous with only a diastolic phase during the cardiac cycle). magent does not perform ultrasound."
},
"portal": {
"enum": [
"normal",
"mild",
"severe"
],
"type": "string",
"description": "Portal-vein Doppler grade as assigned by the caller (Beaubien-Souligny 2020 Figure 1 caption): normal (pulsatility fraction not in the mild or severe bands); mild (velocity variation 30 to <50%); severe (variation ≥50%). magent does not perform ultrasound."
},
"hepatic": {
"enum": [
"normal",
"mild",
"severe"
],
"type": "string",
"description": "Hepatic-vein Doppler grade as assigned by the caller (Beaubien-Souligny 2020 Figure 1): normal (not mild and not severe; triphasic S > D toward the liver); mild (S component lower in magnitude than D but still toward the liver); severe (S component reversed, toward the heart). magent does not perform ultrasound."
},
"ivc_dilated": {
"type": "boolean",
"description": "Whether the IVC is dilated as assigned by the caller. Dilated iff maximal IVC diameter ≥2 cm (Beaubien-Souligny 2020). true or false. Grade 0 whenever this is false, regardless of Doppler. magent does not measure IVC."
}
}
},
"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 12:55Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-22 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. 10 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/vexus, 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.