magent
King's College criteria (O'Grady 1989) for poor prognosis in fulminant hepatic failure. Acetaminophen: arterial pH <7.30, or PT >100 s plus creatinine >300 umol/L plus grade III/IV encephalopathy. Non-acetaminophen: PT >100 s, or any 3 of age <11 or >40, unfavorable etiology (non-A non-B or drug reaction), jaundice-to-encephalopathy >7 days, bilirubin >300 umol/L, PT >50 s. PT seconds, not INR. Not a transplant listing order.
TradingLiveeip155:8453Exactvia cdp
Kings-collegeLiverAcetaminophenPrognosisCalculator
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 15 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 13:06Z
—
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/kings_college",
"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/kings_college",
"tags": [
"kings-college",
"liver",
"acetaminophen",
"prognosis",
"calculator"
],
"mimeType": "application/json",
"description": "King's College criteria (O'Grady 1989) for poor prognosis in fulminant hepatic failure. Acetaminophen: arterial pH <7.30, or PT >100 s plus creatinine >300 umol/L plus grade III/IV encephalopathy. Non-acetaminophen: PT >100 s, or any 3 of age <11 or >40, unfavorable etiology (non-A non-B or drug reaction), jaundice-to-encephalopathy >7 days, bilirubin >300 umol/L, PT >50 s. PT seconds, not INR. Not a transplant listing order.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"pt_sec": 20,
"etiology": "acetaminophen",
"age_years": 30,
"arterial_ph": 7.4,
"bilirubin_umol_l": 50,
"creatinine_umol_l": 80,
"encephalopathy_grade": 1,
"unfavorable_etiology": false,
"jaundice_to_encephalopathy_days": 2
}
},
"output": {
"type": "json",
"example": {
"formula": "kings_college",
"citation": {
"id": "ogrady-1989",
"doi": "10.1016/0016-5085(89)90081-4",
"pmid": "2490426",
"title": "Early indicators of prognosis in fulminant hepatic failure",
"source": "Gastroenterology. 1989;97(2):439-445",
"authors": "O'Grady JG, Alexander GJ, Hayllar KM, Williams R"
},
"criteria": [
{
"met": false,
"value": 7.4,
"factor": "arterial_ph_lt_7_30"
},
{
"met": false,
"value": 20,
"factor": "pt_sec_gt_100"
},
{
"met": false,
"value": 80,
"factor": "creatinine_umol_l_gt_300"
},
{
"met": false,
"value": 1,
"factor": "encephalopathy_grade_ge_3"
}
],
"etiology": "acetaminophen",
"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.",
"criteria_met": false,
"formula_expression": "acetaminophen: arterial_ph < 7.30, or (pt_sec > 100 and creatinine_umol_l > 300 and encephalopathy_grade >= 3); non_acetaminophen: pt_sec > 100, or at least 3 of (age_years < 11 or > 40; unfavorable_etiology; jaundice_to_encephalopathy_days > 7; bilirubin_umol_l > 300; pt_sec > 50)"
}
},
"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": [
"etiology",
"arterial_ph",
"pt_sec",
"creatinine_umol_l",
"encephalopathy_grade",
"age_years",
"unfavorable_etiology",
"jaundice_to_encephalopathy_days",
"bilirubin_umol_l"
],
"properties": {
"pt_sec": {
"type": "number",
"description": "Prothrombin time in seconds (8-120) as published in 1989. INR is not accepted. Acetaminophen combo uses PT > 100; non-acetaminophen uses PT > 100 alone or PT > 50 as one of five factors."
},
"etiology": {
"enum": [
"acetaminophen",
"non_acetaminophen"
],
"type": "string",
"description": "acetaminophen or non_acetaminophen (O'Grady 1989). Selects the paracetamol or non-paracetamol poor-prognosis tree. Required on every request."
},
"age_years": {
"type": "integer",
"description": "Age in years (0-120). Non-acetaminophen factor met when age < 11 or age > 40 (1989 abstract, not a later <10 restatement). Required even on the acetaminophen tree; not scored there."
},
"arterial_ph": {
"type": "number",
"description": "Arterial pH (6.80-7.80). Acetaminophen criterion met when pH < 7.30, independent of encephalopathy. Required even on the non-acetaminophen tree; not scored there."
},
"bilirubin_umol_l": {
"type": "number",
"description": "Serum bilirubin in umol/L (2-684). Non-acetaminophen factor met when > 300. Required even on the acetaminophen tree; not scored there."
},
"creatinine_umol_l": {
"type": "number",
"description": "Serum creatinine in umol/L (9-1768). Acetaminophen combo criterion met when > 300. Required even on the non-acetaminophen tree; not scored there."
},
"encephalopathy_grade": {
"type": "integer",
"description": "Hepatic encephalopathy grade 0-4 as assigned by the caller (Conn 1977 / West Haven). Acetaminophen combo uses grade >= 3 (grade III/IV). Required even on the non-acetaminophen tree; not scored there. magent does not examine the patient."
},
"unfavorable_etiology": {
"type": "boolean",
"description": "Unfavorable etiology as assigned by the caller (paper: non-A non-B hepatitis or drug reaction). true or false. Non-acetaminophen any-3 factor. Required even on the acetaminophen tree; not scored there."
},
"jaundice_to_encephalopathy_days": {
"type": "integer",
"description": "Days from jaundice to encephalopathy (integer 0-90). Non-acetaminophen factor met when > 7. Required even on the acetaminophen tree; not scored there."
}
}
}
},
"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/kings_college",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"pt_sec": 20,
"etiology": "acetaminophen",
"age_years": 30,
"arterial_ph": 7.4,
"bilirubin_umol_l": 50,
"creatinine_umol_l": 80,
"encephalopathy_grade": 1,
"unfavorable_etiology": false,
"jaundice_to_encephalopathy_days": 2
},
{
"pt_sec": 20,
"etiology": "acetaminophen",
"age_years": 30,
"arterial_ph": 7.4,
"bilirubin_umol_l": 50,
"creatinine_umol_l": 80,
"encephalopathy_grade": 1,
"unfavorable_etiology": false,
"jaundice_to_encephalopathy_days": 2
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/kings_college",
"count": 2,
"items": [
{
"formula": "kings_college",
"citation": {
"id": "ogrady-1989",
"doi": "10.1016/0016-5085(89)90081-4",
"pmid": "2490426",
"title": "Early indicators of prognosis in fulminant hepatic failure",
"source": "Gastroenterology. 1989;97(2):439-445",
"authors": "O'Grady JG, Alexander GJ, Hayllar KM, Williams R"
},
"criteria": [
{
"met": false,
"value": 7.4,
"factor": "arterial_ph_lt_7_30"
},
{
"met": false,
"value": 20,
"factor": "pt_sec_gt_100"
},
{
"met": false,
"value": 80,
"factor": "creatinine_umol_l_gt_300"
},
{
"met": false,
"value": 1,
"factor": "encephalopathy_grade_ge_3"
}
],
"etiology": "acetaminophen",
"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.",
"criteria_met": false,
"formula_expression": "acetaminophen: arterial_ph < 7.30, or (pt_sec > 100 and creatinine_umol_l > 300 and encephalopathy_grade >= 3); non_acetaminophen: pt_sec > 100, or at least 3 of (age_years < 11 or > 40; unfavorable_etiology; jaundice_to_encephalopathy_days > 7; bilirubin_umol_l > 300; pt_sec > 50)"
},
{
"formula": "kings_college",
"citation": {
"id": "ogrady-1989",
"doi": "10.1016/0016-5085(89)90081-4",
"pmid": "2490426",
"title": "Early indicators of prognosis in fulminant hepatic failure",
"source": "Gastroenterology. 1989;97(2):439-445",
"authors": "O'Grady JG, Alexander GJ, Hayllar KM, Williams R"
},
"criteria": [
{
"met": false,
"value": 7.4,
"factor": "arterial_ph_lt_7_30"
},
{
"met": false,
"value": 20,
"factor": "pt_sec_gt_100"
},
{
"met": false,
"value": 80,
"factor": "creatinine_umol_l_gt_300"
},
{
"met": false,
"value": 1,
"factor": "encephalopathy_grade_ge_3"
}
],
"etiology": "acetaminophen",
"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.",
"criteria_met": false,
"formula_expression": "acetaminophen: arterial_ph < 7.30, or (pt_sec > 100 and creatinine_umol_l > 300 and encephalopathy_grade >= 3); non_acetaminophen: pt_sec > 100, or at least 3 of (age_years < 11 or > 40; unfavorable_etiology; jaundice_to_encephalopathy_days > 7; bilirubin_umol_l > 300; pt_sec > 50)"
}
]
}
},
"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": [
"etiology",
"arterial_ph",
"pt_sec",
"creatinine_umol_l",
"encephalopathy_grade",
"age_years",
"unfavorable_etiology",
"jaundice_to_encephalopathy_days",
"bilirubin_umol_l"
],
"properties": {
"pt_sec": {
"type": "number",
"description": "Prothrombin time in seconds (8-120) as published in 1989. INR is not accepted. Acetaminophen combo uses PT > 100; non-acetaminophen uses PT > 100 alone or PT > 50 as one of five factors."
},
"etiology": {
"enum": [
"acetaminophen",
"non_acetaminophen"
],
"type": "string",
"description": "acetaminophen or non_acetaminophen (O'Grady 1989). Selects the paracetamol or non-paracetamol poor-prognosis tree. Required on every request."
},
"age_years": {
"type": "integer",
"description": "Age in years (0-120). Non-acetaminophen factor met when age < 11 or age > 40 (1989 abstract, not a later <10 restatement). Required even on the acetaminophen tree; not scored there."
},
"arterial_ph": {
"type": "number",
"description": "Arterial pH (6.80-7.80). Acetaminophen criterion met when pH < 7.30, independent of encephalopathy. Required even on the non-acetaminophen tree; not scored there."
},
"bilirubin_umol_l": {
"type": "number",
"description": "Serum bilirubin in umol/L (2-684). Non-acetaminophen factor met when > 300. Required even on the acetaminophen tree; not scored there."
},
"creatinine_umol_l": {
"type": "number",
"description": "Serum creatinine in umol/L (9-1768). Acetaminophen combo criterion met when > 300. Required even on the non-acetaminophen tree; not scored there."
},
"encephalopathy_grade": {
"type": "integer",
"description": "Hepatic encephalopathy grade 0-4 as assigned by the caller (Conn 1977 / West Haven). Acetaminophen combo uses grade >= 3 (grade III/IV). Required even on the non-acetaminophen tree; not scored there. magent does not examine the patient."
},
"unfavorable_etiology": {
"type": "boolean",
"description": "Unfavorable etiology as assigned by the caller (paper: non-A non-B hepatitis or drug reaction). true or false. Non-acetaminophen any-3 factor. Required even on the acetaminophen tree; not scored there."
},
"jaundice_to_encephalopathy_days": {
"type": "integer",
"description": "Days from jaundice to encephalopathy (integer 0-90). Non-acetaminophen factor met when > 7. Required even on the acetaminophen tree; not scored there."
}
}
},
"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 13:06Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 18:45Z
- 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. 15 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/kings_college, 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.