magent
Okhunov 2013 STONE nephrolithometry for kidney calculi (PCNL). Caller-assigned published item points: size 0_399 1 / 400_799 2 / 800_1599 3 / ge_1600 4 (mm²); tract le_100 1 / gt_100 2 (skin-to-stone mm); obstruction none_or_mild 1 / moderate_or_severe 2 (hydronephrosis); calyces 1_or_2 1 / 3 2 / staghorn 3; essence le_950 1 / gt_950 2 (HU). Sum 5-13. No published SFR bands. Not the Moore 2014 ureteral STONE score. magent does not measure CT. Not a medical device. Not a PCNL order.
TradingLiveeip155:8453Exactvia cdp
Stone-nephrolithometryPcnlKidneyUrologyCalculator
Calls · 30d
2→ 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.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-31 12:59Z
—
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/stone_nephrolithometry",
"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/stone_nephrolithometry",
"tags": [
"stone-nephrolithometry",
"pcnl",
"kidney",
"urology",
"calculator"
],
"mimeType": "application/json",
"description": "Okhunov 2013 STONE nephrolithometry for kidney calculi (PCNL). Caller-assigned published item points: size 0_399 1 / 400_799 2 / 800_1599 3 / ge_1600 4 (mm²); tract le_100 1 / gt_100 2 (skin-to-stone mm); obstruction none_or_mild 1 / moderate_or_severe 2 (hydronephrosis); calyces 1_or_2 1 / 3 2 / staghorn 3; essence le_950 1 / gt_950 2 (HU). Sum 5-13. No published SFR bands. Not the Moore 2014 ureteral STONE score. magent does not measure CT. Not a medical device. Not a PCNL order.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"size": "0_399",
"tract": "le_100",
"calyces": "1_or_2",
"essence": "le_950",
"obstruction": "none_or_mild"
}
},
"output": {
"type": "json",
"example": {
"size": "0_399",
"score": 5,
"tract": "le_100",
"calyces": "1_or_2",
"essence": "le_950",
"formula": "stone_nephrolithometry",
"citation": {
"id": "okhunov-2013",
"doi": "10.1016/j.urology.2012.10.083",
"pmid": "23540858",
"title": "S.T.O.N.E. nephrolithometry: novel surgical classification system for kidney calculi",
"source": "Urology. 2013;81(6):1154-1159",
"authors": "Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z"
},
"max_score": 13,
"components": [
{
"value": "0_399",
"factor": "size",
"points": 1,
"present": true
},
{
"value": "le_100",
"factor": "tract",
"points": 1,
"present": true
},
{
"value": "none_or_mild",
"factor": "obstruction",
"points": 1,
"present": true
},
{
"value": "1_or_2",
"factor": "calyces",
"points": 1,
"present": true
},
{
"value": "le_950",
"factor": "essence",
"points": 1,
"present": true
}
],
"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.",
"obstruction": "none_or_mild",
"formula_expression": "STONE = size (0_399 1, 400_799 2, 800_1599 3, ge_1600 4) + tract (le_100 1, gt_100 2) + obstruction (none_or_mild 1, moderate_or_severe 2) + calyces (1_or_2 1, 3 2, staghorn 3) + essence (le_950 1, gt_950 2); Okhunov 2013 STONE nephrolithometry; sum 5-13; no published SFR bands"
}
},
"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": [
"size",
"tract",
"obstruction",
"calyces",
"essence"
],
"properties": {
"size": {
"enum": [
"0_399",
"400_799",
"800_1599",
"ge_1600"
],
"type": "string",
"description": "Caller-assigned stone size in mm² (Okhunov 2013). 0_399 (0–399 mm²) scores 1; 400_799 (400–799 mm²) scores 2; 800_1599 (800–1599 mm²) scores 3; ge_1600 (≥1600 mm²) scores 4. magent does not measure stone size or CT."
},
"tract": {
"enum": [
"le_100",
"gt_100"
],
"type": "string",
"description": "Caller-assigned tract length in mm, skin-to-stone (Okhunov 2013). le_100 (≤100 mm) scores 1; gt_100 (>100 mm) scores 2. magent does not measure tract length or CT."
},
"calyces": {
"enum": [
"1_or_2",
"3",
"staghorn"
],
"type": "string",
"description": "Caller-assigned number of involved calyces or staghorn (Okhunov 2013). 1_or_2 scores 1; 3 scores 2; staghorn scores 3. magent does not count calyces or read CT."
},
"essence": {
"enum": [
"le_950",
"gt_950"
],
"type": "string",
"description": "Caller-assigned stone density in Hounsfield units (Okhunov 2013 essence). le_950 (≤950 HU) scores 1; gt_950 (>950 HU) scores 2. magent does not measure HU or CT."
},
"obstruction": {
"enum": [
"none_or_mild",
"moderate_or_severe"
],
"type": "string",
"description": "Caller-assigned hydronephrosis / obstruction (Okhunov 2013). none_or_mild scores 1; moderate_or_severe scores 2. magent does not measure hydronephrosis or CT."
}
}
}
},
"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/stone_nephrolithometry",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"size": "0_399",
"tract": "le_100",
"calyces": "1_or_2",
"essence": "le_950",
"obstruction": "none_or_mild"
},
{
"size": "0_399",
"tract": "le_100",
"calyces": "1_or_2",
"essence": "le_950",
"obstruction": "none_or_mild"
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/stone_nephrolithometry",
"count": 2,
"items": [
{
"size": "0_399",
"score": 5,
"tract": "le_100",
"calyces": "1_or_2",
"essence": "le_950",
"formula": "stone_nephrolithometry",
"citation": {
"id": "okhunov-2013",
"doi": "10.1016/j.urology.2012.10.083",
"pmid": "23540858",
"title": "S.T.O.N.E. nephrolithometry: novel surgical classification system for kidney calculi",
"source": "Urology. 2013;81(6):1154-1159",
"authors": "Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z"
},
"max_score": 13,
"components": [
{
"value": "0_399",
"factor": "size",
"points": 1,
"present": true
},
{
"value": "le_100",
"factor": "tract",
"points": 1,
"present": true
},
{
"value": "none_or_mild",
"factor": "obstruction",
"points": 1,
"present": true
},
{
"value": "1_or_2",
"factor": "calyces",
"points": 1,
"present": true
},
{
"value": "le_950",
"factor": "essence",
"points": 1,
"present": true
}
],
"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.",
"obstruction": "none_or_mild",
"formula_expression": "STONE = size (0_399 1, 400_799 2, 800_1599 3, ge_1600 4) + tract (le_100 1, gt_100 2) + obstruction (none_or_mild 1, moderate_or_severe 2) + calyces (1_or_2 1, 3 2, staghorn 3) + essence (le_950 1, gt_950 2); Okhunov 2013 STONE nephrolithometry; sum 5-13; no published SFR bands"
},
{
"size": "0_399",
"score": 5,
"tract": "le_100",
"calyces": "1_or_2",
"essence": "le_950",
"formula": "stone_nephrolithometry",
"citation": {
"id": "okhunov-2013",
"doi": "10.1016/j.urology.2012.10.083",
"pmid": "23540858",
"title": "S.T.O.N.E. nephrolithometry: novel surgical classification system for kidney calculi",
"source": "Urology. 2013;81(6):1154-1159",
"authors": "Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z"
},
"max_score": 13,
"components": [
{
"value": "0_399",
"factor": "size",
"points": 1,
"present": true
},
{
"value": "le_100",
"factor": "tract",
"points": 1,
"present": true
},
{
"value": "none_or_mild",
"factor": "obstruction",
"points": 1,
"present": true
},
{
"value": "1_or_2",
"factor": "calyces",
"points": 1,
"present": true
},
{
"value": "le_950",
"factor": "essence",
"points": 1,
"present": true
}
],
"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.",
"obstruction": "none_or_mild",
"formula_expression": "STONE = size (0_399 1, 400_799 2, 800_1599 3, ge_1600 4) + tract (le_100 1, gt_100 2) + obstruction (none_or_mild 1, moderate_or_severe 2) + calyces (1_or_2 1, 3 2, staghorn 3) + essence (le_950 1, gt_950 2); Okhunov 2013 STONE nephrolithometry; sum 5-13; no published SFR bands"
}
]
}
},
"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": [
"size",
"tract",
"obstruction",
"calyces",
"essence"
],
"properties": {
"size": {
"enum": [
"0_399",
"400_799",
"800_1599",
"ge_1600"
],
"type": "string",
"description": "Caller-assigned stone size in mm² (Okhunov 2013). 0_399 (0–399 mm²) scores 1; 400_799 (400–799 mm²) scores 2; 800_1599 (800–1599 mm²) scores 3; ge_1600 (≥1600 mm²) scores 4. magent does not measure stone size or CT."
},
"tract": {
"enum": [
"le_100",
"gt_100"
],
"type": "string",
"description": "Caller-assigned tract length in mm, skin-to-stone (Okhunov 2013). le_100 (≤100 mm) scores 1; gt_100 (>100 mm) scores 2. magent does not measure tract length or CT."
},
"calyces": {
"enum": [
"1_or_2",
"3",
"staghorn"
],
"type": "string",
"description": "Caller-assigned number of involved calyces or staghorn (Okhunov 2013). 1_or_2 scores 1; 3 scores 2; staghorn scores 3. magent does not count calyces or read CT."
},
"essence": {
"enum": [
"le_950",
"gt_950"
],
"type": "string",
"description": "Caller-assigned stone density in Hounsfield units (Okhunov 2013 essence). le_950 (≤950 HU) scores 1; gt_950 (>950 HU) scores 2. magent does not measure HU or CT."
},
"obstruction": {
"enum": [
"none_or_mild",
"moderate_or_severe"
],
"type": "string",
"description": "Caller-assigned hydronephrosis / obstruction (Okhunov 2013). none_or_mild scores 1; moderate_or_severe scores 2. magent does not measure hydronephrosis or CT."
}
}
},
"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 12:59Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-22 06:45Z
- 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. 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/stone_nephrolithometry, 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.