ToolVet
69trust / 100

Calc Pecarn Head

by magent in Security & trust

x402 APIFailing, checked 28 min ago

PECARN pediatric head CT (Kuppermann 2009). Two age trees (under 2 vs 2-17). High if any age-applicable high-risk factor (GCS <=14 or altered mental status in both; palpable skull fracture if under 2; signs of basilar skull fracture if 2 or older), else intermediate if any age-applicable intermediate factor, else low. CT recommended only when high. Not a diagnosis. Not Canadian CT Head, CATCH, CHALICE, NEXUS, or PECARN IAI/febrile/c-spine. magent does not examine the patient.

POST
https://api.magentlab.com/api/calc/pecarn_head
Price
$0.007
per call in USDC
Uptime
97.0%
last 30 days
Response time
165 ms
596 ms slowest 5%
Last check
Failed
28 min ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 28 min ago: Timed out

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

How to call it

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

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/pecarn_head
content-type: application/json

{
  "items": [
    {
      "age": 10,
      "altered_mental_status": false,
      "gcs_le_14": false,
      "history_of_loc": false,
      "history_of_vomiting": false,
      "loc_ge_5_seconds": false,
      "nonfrontal_scalp_hematoma": false,
      "not_acting_normally": false,
      "palpable_skull_fracture": false,
      "severe_headache": false,
      "severe_mechanism": false,
      "signs_basilar_skull_fracture": false
    },
    {
      "age": 10,
      "altered_mental_status": false,
      "gcs_le_14": false,
      "history_of_loc": false,
      "history_of_vomiting": false,
      "loc_ge_5_seconds": false,
      "nonfrontal_scalp_hematoma": false,
      "not_acting_normally": false,
      "palpable_skull_fracture": false,
      "severe_headache": false,
      "severe_mechanism": false,
      "signs_basilar_skull_fracture": false
    }
  ]
}

Parameters

ParameterTypeRequiredDescription
itemsarray of objectYes

Example response

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

Example response, 102 lines
{
  "count": 2,
  "items": [
    {
      "age_band": "ge_2",
      "age_years": 10,
      "citation": {
        "authors": "Kuppermann N, Holmes JF, Dayan PS, et al.",
        "doi": "10.1016/S0140-6736(09)61558-0",
        "id": "kuppermann-2009",
        "source": "Lancet. 2009;374(9696):1160-1170",
        "title": "Identification of children at very low risk of clinically-important brain injuries after head trauma: a prospective cohort study"
      },
      "criteria": [
        {
          "factor": "gcs_le_14",
          "met": false
        },
        {
          "factor": "altered_mental_status",
          "met": false
        },
        {
          "factor": "signs_basilar_skull_fracture",
          "met": false
        },
        {
          "factor": "history_of_loc",
          "met": false
        },
        {
          "factor": "history_of_vomiting",
          "met": false
        },
        {
          "factor": "severe_headache",
          "met": false
        },
        {
          "factor": "severe_mechanism",
          "met": false
        }
      ],
      "ct_not_recommended": true,
      "ct_recommended": 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": "pecarn_head",
      "formula_expression": "high if any age-applicable high-risk factor, else intermediate if any age-applicable intermediate factor, else low; lt_2 tree if age < 2, ge_2 tree if age 2-17",
      "observation_vs_ct": false,
      "risk_tier": "low"
    },
    {
      "age_band": "ge_2",
      "age_years": 10,
      "citation": {
        "authors": "Kuppermann N, Holmes JF, Dayan PS, et al.",
        "doi": "10.1016/S0140-6736(09)61558-0",
        "id": "kuppermann-2009",
        "source": "Lancet. 2009;374(9696):1160-1170",
        "title": "Identification of children at very low risk of clinically-important brain injuries after head trauma: a prospective cohort study"
      },
      "criteria": [
        {
          "factor": "gcs_le_14",
          "met": false
        },
        {
          "factor": "altered_mental_status",
          "met": false
        },
        {
          "factor": "signs_basilar_skull_fracture",
          "met": false
        },
        {
          "factor": "history_of_loc",
          "met": false
        },
        {
          "factor": "history_of_vomiting",
          "met": false
        },
        {
          "factor": "severe_headache",
          "met": false
        },
        {
          "factor": "severe_mechanism",
          "met": false
        }
      ],
      "ct_not_recommended": true,
      "ct_recommended": 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": "pecarn_head",
      "formula_expression": "high if any age-applicable high-risk factor, else intermediate if any age-applicable intermediate factor, else low; lt_2 tree if age < 2, ge_2 tree if age 2-17",
      "observation_vs_ct": false,
      "risk_tier": "low"
    }
  ],
  "path": "/api/calc/pecarn_head"
}

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/pecarn_head' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":10,"altered_mental_status":false,"gcs_le_14":false,"history_of_loc":false,"history_of_vomiting":false,"loc_ge_5_seconds":false,"nonfrontal_scalp_hematoma":false,"not_acting_normally":false,"palpable_skull_fracture":false,"severe_headache":false,"severe_mechanism":false,"signs_basilar_skull_fracture":false},{"age":10,"altered_mental_status":false,"gcs_le_14":false,"history_of_loc":false,"history_of_vomiting":false,"loc_ge_5_seconds":false,"nonfrontal_scalp_hematoma":false,"not_acting_normally":false,"palpable_skull_fracture":false,"severe_headache":false,"severe_mechanism":false,"signs_basilar_skull_fracture":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/pecarn_head' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":10,"altered_mental_status":false,"gcs_le_14":false,"history_of_loc":false,"history_of_vomiting":false,"loc_ge_5_seconds":false,"nonfrontal_scalp_hematoma":false,"not_acting_normally":false,"palpable_skull_fracture":false,"severe_headache":false,"severe_mechanism":false,"signs_basilar_skull_fracture":false},{"age":10,"altered_mental_status":false,"gcs_le_14":false,"history_of_loc":false,"history_of_vomiting":false,"loc_ge_5_seconds":false,"nonfrontal_scalp_hematoma":false,"not_acting_normally":false,"palpable_skull_fracture":false,"severe_headache":false,"severe_mechanism":false,"signs_basilar_skull_fracture":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%2Fpecarn_head&method=POST
const res = await pay("https://api.magentlab.com/api/calc/pecarn_head", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "age": 10,
        "altered_mental_status": false,
        "gcs_le_14": false,
        "history_of_loc": false,
        "history_of_vomiting": false,
        "loc_ge_5_seconds": false,
        "nonfrontal_scalp_hematoma": false,
        "not_acting_normally": false,
        "palpable_skull_fracture": false,
        "severe_headache": false,
        "severe_mechanism": false,
        "signs_basilar_skull_fracture": false
      },
      {
        "age": 10,
        "altered_mental_status": false,
        "gcs_le_14": false,
        "history_of_loc": false,
        "history_of_vomiting": false,
        "loc_ge_5_seconds": false,
        "nonfrontal_scalp_hematoma": false,
        "not_acting_normally": false,
        "palpable_skull_fracture": false,
        "severe_headache": false,
        "severe_mechanism": false,
        "signs_basilar_skull_fracture": 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/pecarn_head",
        json={
            "items": [
                {
                    "age": 10,
                    "altered_mental_status": False,
                    "gcs_le_14": False,
                    "history_of_loc": False,
                    "history_of_vomiting": False,
                    "loc_ge_5_seconds": False,
                    "nonfrontal_scalp_hematoma": False,
                    "not_acting_normally": False,
                    "palpable_skull_fracture": False,
                    "severe_headache": False,
                    "severe_mechanism": False,
                    "signs_basilar_skull_fracture": False,
                },
                {
                    "age": 10,
                    "altered_mental_status": False,
                    "gcs_le_14": False,
                    "history_of_loc": False,
                    "history_of_vomiting": False,
                    "loc_ge_5_seconds": False,
                    "nonfrontal_scalp_hematoma": False,
                    "not_acting_normally": False,
                    "palpable_skull_fracture": False,
                    "severe_headache": False,
                    "severe_mechanism": False,
                    "signs_basilar_skull_fracture": 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
28 min agoTimed out---
5 h agoPassed402306 ms$0.007
10 h agoPassed402159 ms$0.007
15 h agoPassed402176 ms$0.007
19 h agoPassed402158 ms$0.007
Show 10 older checks
24 h agoPassed402214 ms$0.007
28 h agoPassed402314 ms$0.007
33 h agoPassed402281 ms$0.007
37 h agoPassed402290 ms$0.007
41 h agoPassed402349 ms$0.007
45 h agoPassed402151 ms$0.007
2 days agoPassed402319 ms$0.007
2 days agoPassed402165 ms$0.007
2 days agoPassed402263 ms$0.007
3 days agoPassed402143 ms$0.007

History

11 Oct 2026Price changed from $0.005 to $0.007