ToolVet
69trust / 100

Calc Ottawa Sah

by magent in Other

x402 APIFailing, checked 1 h ago

Ottawa SAH Rule (Perry 2013 JAMA). Investigate when any of six findings is present: age 40 or older, neck pain or stiffness, witnessed loss of consciousness, onset during exertion, thunderclap headache (instantly peaking pain), or limited neck flexion on examination. Not a diagnosis of SAH, not Hunt-Hess, and not Fisher grade. For alert, neurologically intact adults with nontraumatic headache peaking within 1 hour as published. magent does not examine the neck.

POST
https://api.magentlab.com/api/calc/ottawa_sah
Price
$0.007
per call in USDC
Uptime
97.0%
last 30 days
Response time
166 ms
386 ms slowest 5%
Last check
Failed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 1 h ago: Timed out

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://api.magentlab.com/api/calc/ottawa_sah

Each call costs $0.007 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://api.magentlab.com/api/calc/ottawa_sah
content-type: application/json

{
  "items": [
    {
      "age": 30,
      "limited_neck_flexion": false,
      "neck_pain_or_stiffness": false,
      "onset_during_exertion": false,
      "thunderclap_headache": false,
      "witnessed_loc": false
    },
    {
      "age": 30,
      "limited_neck_flexion": false,
      "neck_pain_or_stiffness": false,
      "onset_during_exertion": false,
      "thunderclap_headache": false,
      "witnessed_loc": false
    }
  ]
}

Parameters

ParameterTypeRequiredDescription
itemsarray of objectYes

Example response

The provider's example. We can't check it without paying.

Example response, 88 lines
{
  "count": 2,
  "items": [
    {
      "age_years": 30,
      "citation": {
        "authors": "Perry JJ, Stiell IG, Sivilotti MLA, et al.",
        "doi": "10.1001/jama.2013.278018",
        "id": "perry-2013",
        "source": "JAMA. 2013;310(12):1248-1255",
        "title": "Clinical decision rules to rule out subarachnoid hemorrhage for acute headache"
      },
      "criteria": [
        {
          "factor": "age_ge_40",
          "met": false,
          "value": 30
        },
        {
          "factor": "neck_pain_or_stiffness",
          "met": false
        },
        {
          "factor": "witnessed_loc",
          "met": false
        },
        {
          "factor": "onset_during_exertion",
          "met": false
        },
        {
          "factor": "thunderclap_headache",
          "met": false
        },
        {
          "factor": "limited_neck_flexion",
          "met": 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.",
      "formula": "ottawa_sah",
      "formula_expression": "Investigation indicated iff age >= 40 or neck_pain_or_stiffness or witnessed_loc or onset_during_exertion or thunderclap_headache or limited_neck_flexion",
      "investigation_indicated": false
    },
    {
      "age_years": 30,
      "citation": {
        "authors": "Perry JJ, Stiell IG, Sivilotti MLA, et al.",
        "doi": "10.1001/jama.2013.278018",
        "id": "perry-2013",
        "source": "JAMA. 2013;310(12):1248-1255",
        "title": "Clinical decision rules to rule out subarachnoid hemorrhage for acute headache"
      },
      "criteria": [
        {
          "factor": "age_ge_40",
          "met": false,
          "value": 30
        },
        {
          "factor": "neck_pain_or_stiffness",
          "met": false
        },
        {
          "factor": "witnessed_loc",
          "met": false
        },
        {
          "factor": "onset_during_exertion",
          "met": false
        },
        {
          "factor": "thunderclap_headache",
          "met": false
        },
        {
          "factor": "limited_neck_flexion",
          "met": 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.",
      "formula": "ottawa_sah",
      "formula_expression": "Investigation indicated iff age >= 40 or neck_pain_or_stiffness or witnessed_loc or onset_during_exertion or thunderclap_headache or limited_neck_flexion",
      "investigation_indicated": false
    }
  ],
  "path": "/api/calc/ottawa_sah"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.007.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.magentlab.com/api/calc/ottawa_sah' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":30,"limited_neck_flexion":false,"neck_pain_or_stiffness":false,"onset_during_exertion":false,"thunderclap_headache":false,"witnessed_loc":false},{"age":30,"limited_neck_flexion":false,"neck_pain_or_stiffness":false,"onset_during_exertion":false,"thunderclap_headache":false,"witnessed_loc":false}]}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://api.magentlab.com/api/calc/ottawa_sah' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":30,"limited_neck_flexion":false,"neck_pain_or_stiffness":false,"onset_during_exertion":false,"thunderclap_headache":false,"witnessed_loc":false},{"age":30,"limited_neck_flexion":false,"neck_pain_or_stiffness":false,"onset_during_exertion":false,"thunderclap_headache":false,"witnessed_loc":false}]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.007 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.007" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.007 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.magentlab.com%2Fapi%2Fcalc%2Fottawa_sah&method=POST
const res = await pay("https://api.magentlab.com/api/calc/ottawa_sah", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "age": 30,
        "limited_neck_flexion": false,
        "neck_pain_or_stiffness": false,
        "onset_during_exertion": false,
        "thunderclap_headache": false,
        "witnessed_loc": false
      },
      {
        "age": 30,
        "limited_neck_flexion": false,
        "neck_pain_or_stiffness": false,
        "onset_during_exertion": false,
        "thunderclap_headache": false,
        "witnessed_loc": false
      }
    ]
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.007 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.007"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.magentlab.com/api/calc/ottawa_sah",
        json={
            "items": [
                {
                    "age": 30,
                    "limited_neck_flexion": False,
                    "neck_pain_or_stiffness": False,
                    "onset_during_exertion": False,
                    "thunderclap_headache": False,
                    "witnessed_loc": False,
                },
                {
                    "age": 30,
                    "limited_neck_flexion": False,
                    "neck_pain_or_stiffness": False,
                    "onset_during_exertion": False,
                    "thunderclap_headache": False,
                    "witnessed_loc": False,
                },
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

1 finding

  • Charges more than its listed price in payment
    Listed at $0.005, charges $0.007

Recent checks

WhenResultHTTPTimePrice
1 h agoTimed out---
6 h agoPassed402361 ms$0.007
11 h agoPassed402148 ms$0.007
15 h agoPassed402196 ms$0.007
20 h agoPassed402140 ms$0.007
Show 10 older checks
25 h agoPassed402181 ms$0.007
29 h agoPassed402146 ms$0.007
33 h agoPassed402146 ms$0.007
37 h agoPassed402142 ms$0.007
42 h agoPassed402143 ms$0.007
46 h agoPassed402166 ms$0.007
2 days agoPassed402277 ms$0.007
2 days agoPassed402146 ms$0.007
2 days agoPassed402282 ms$0.007
3 days agoPassed402187 ms$0.007

History

11 Oct 2026Price changed from $0.005 to $0.007