magent
Ottawa ankle rule (Stiell 1992). Ankle x-ray is indicated when there is malleolar-zone pain and any of: bone tenderness at the posterior edge or tip of the lateral or medial malleolus, or inability to bear weight both immediately after injury and in the emergency department (four steps). One weight-bearing failure alone is not enough. Not a diagnosis of fracture, not the Ottawa foot rule, and not the Pittsburgh knee rule. magent does not examine the ankle.
SearchLiveeip155:8453Exactvia cdp
Ottawa-ankleAnkleRadiographyEmergencyCalculator
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 13:20Z
—
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/ottawa_ankle",
"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/ottawa_ankle",
"tags": [
"ottawa-ankle",
"ankle",
"radiography",
"emergency",
"calculator"
],
"mimeType": "application/json",
"description": "Ottawa ankle rule (Stiell 1992). Ankle x-ray is indicated when there is malleolar-zone pain and any of: bone tenderness at the posterior edge or tip of the lateral or medial malleolus, or inability to bear weight both immediately after injury and in the emergency department (four steps). One weight-bearing failure alone is not enough. Not a diagnosis of fracture, not the Ottawa foot rule, and not the Pittsburgh knee rule. magent does not examine the ankle.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"malleolar_pain": false,
"medial_malleolus_tenderness": false,
"unable_to_bear_weight_in_ed": false,
"lateral_malleolus_tenderness": false,
"unable_to_bear_weight_immediately": false
}
},
"output": {
"type": "json",
"example": {
"formula": "ottawa_ankle",
"citation": {
"id": "stiell-1992",
"doi": "10.1016/S0196-0644(05)82656-3",
"title": "A study to develop clinical decision rules for the use of radiography in acute ankle injuries",
"source": "Ann Emerg Med. 1992;21(4):384-390",
"authors": "Stiell IG, Greenberg GH, McKnight RD, Nair RC, McDowell I, Worthington JR"
},
"criteria": [
{
"met": false,
"factor": "malleolar_pain"
},
{
"met": false,
"factor": "lateral_malleolus_tenderness"
},
{
"met": false,
"factor": "medial_malleolus_tenderness"
},
{
"met": false,
"factor": "unable_to_bear_weight_both",
"unable_to_bear_weight_in_ed": false,
"unable_to_bear_weight_immediately": false
}
],
"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.",
"xray_indicated": false,
"formula_expression": "Ankle x-ray indicated iff malleolar_pain and (lateral_malleolus_tenderness or medial_malleolus_tenderness or (unable_to_bear_weight_immediately and unable_to_bear_weight_in_ed))"
}
},
"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": [
"malleolar_pain",
"lateral_malleolus_tenderness",
"medial_malleolus_tenderness",
"unable_to_bear_weight_immediately",
"unable_to_bear_weight_in_ed"
],
"properties": {
"malleolar_pain": {
"type": "boolean",
"description": "Pain in the malleolar zone as assigned by the caller. true or false. Ankle x-ray is not indicated when false, even if tenderness flags are true."
},
"medial_malleolus_tenderness": {
"type": "boolean",
"description": "Bone tenderness at the posterior edge or tip of the medial malleolus. true or false. Applies only inside the malleolar zone."
},
"unable_to_bear_weight_in_ed": {
"type": "boolean",
"description": "Unable to bear weight in the emergency department (four steps). true or false. Counts only when also unable immediately after injury."
},
"lateral_malleolus_tenderness": {
"type": "boolean",
"description": "Bone tenderness at the posterior edge or tip of the lateral malleolus. true or false. Applies only inside the malleolar zone."
},
"unable_to_bear_weight_immediately": {
"type": "boolean",
"description": "Unable to bear weight immediately after injury (four steps). true or false. Counts only when also unable in the emergency department."
}
}
}
},
"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/ottawa_ankle",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"malleolar_pain": false,
"medial_malleolus_tenderness": false,
"unable_to_bear_weight_in_ed": false,
"lateral_malleolus_tenderness": false,
"unable_to_bear_weight_immediately": false
},
{
"malleolar_pain": false,
"medial_malleolus_tenderness": false,
"unable_to_bear_weight_in_ed": false,
"lateral_malleolus_tenderness": false,
"unable_to_bear_weight_immediately": false
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/ottawa_ankle",
"count": 2,
"items": [
{
"formula": "ottawa_ankle",
"citation": {
"id": "stiell-1992",
"doi": "10.1016/S0196-0644(05)82656-3",
"title": "A study to develop clinical decision rules for the use of radiography in acute ankle injuries",
"source": "Ann Emerg Med. 1992;21(4):384-390",
"authors": "Stiell IG, Greenberg GH, McKnight RD, Nair RC, McDowell I, Worthington JR"
},
"criteria": [
{
"met": false,
"factor": "malleolar_pain"
},
{
"met": false,
"factor": "lateral_malleolus_tenderness"
},
{
"met": false,
"factor": "medial_malleolus_tenderness"
},
{
"met": false,
"factor": "unable_to_bear_weight_both",
"unable_to_bear_weight_in_ed": false,
"unable_to_bear_weight_immediately": false
}
],
"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.",
"xray_indicated": false,
"formula_expression": "Ankle x-ray indicated iff malleolar_pain and (lateral_malleolus_tenderness or medial_malleolus_tenderness or (unable_to_bear_weight_immediately and unable_to_bear_weight_in_ed))"
},
{
"formula": "ottawa_ankle",
"citation": {
"id": "stiell-1992",
"doi": "10.1016/S0196-0644(05)82656-3",
"title": "A study to develop clinical decision rules for the use of radiography in acute ankle injuries",
"source": "Ann Emerg Med. 1992;21(4):384-390",
"authors": "Stiell IG, Greenberg GH, McKnight RD, Nair RC, McDowell I, Worthington JR"
},
"criteria": [
{
"met": false,
"factor": "malleolar_pain"
},
{
"met": false,
"factor": "lateral_malleolus_tenderness"
},
{
"met": false,
"factor": "medial_malleolus_tenderness"
},
{
"met": false,
"factor": "unable_to_bear_weight_both",
"unable_to_bear_weight_in_ed": false,
"unable_to_bear_weight_immediately": false
}
],
"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.",
"xray_indicated": false,
"formula_expression": "Ankle x-ray indicated iff malleolar_pain and (lateral_malleolus_tenderness or medial_malleolus_tenderness or (unable_to_bear_weight_immediately and unable_to_bear_weight_in_ed))"
}
]
}
},
"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": [
"malleolar_pain",
"lateral_malleolus_tenderness",
"medial_malleolus_tenderness",
"unable_to_bear_weight_immediately",
"unable_to_bear_weight_in_ed"
],
"properties": {
"malleolar_pain": {
"type": "boolean",
"description": "Pain in the malleolar zone as assigned by the caller. true or false. Ankle x-ray is not indicated when false, even if tenderness flags are true."
},
"medial_malleolus_tenderness": {
"type": "boolean",
"description": "Bone tenderness at the posterior edge or tip of the medial malleolus. true or false. Applies only inside the malleolar zone."
},
"unable_to_bear_weight_in_ed": {
"type": "boolean",
"description": "Unable to bear weight in the emergency department (four steps). true or false. Counts only when also unable immediately after injury."
},
"lateral_malleolus_tenderness": {
"type": "boolean",
"description": "Bone tenderness at the posterior edge or tip of the lateral malleolus. true or false. Applies only inside the malleolar zone."
},
"unable_to_bear_weight_immediately": {
"type": "boolean",
"description": "Unable to bear weight immediately after injury (four steps). true or false. Counts only when also unable in the emergency department."
}
}
},
"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 13:20Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 14:45Z
- 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/ottawa_ankle, 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.