69trust / 100

Calc Pediatric Nexus Ii

x402 APIFailing, checked 42 min ago

Pediatric NEXUS II (Gupta 2018). Low-risk iff all seven flags are false: skull fracture, scalp hematoma, neurologic deficit, altered alertness, abnormal behavior, persistent vomiting, and coagulopathy. Age 0-17 is required but is not a criterion; adult NEXUS Head CT age >= 65 is dropped. Not a diagnosis, not a CT order, not Mower 2017 adult NEXUS Head CT, not PECARN, CATCH, or CHALICE, and not Hoffman 2000 NEXUS C-spine. magent does not examine the patient.

POST

https://api.magentlab.com/api/calc/pediatric_nexus_ii

Price: $0.007; per call in USDC
Uptime: 97.0%; last 30 days
Response time: 222 ms; 1.5 s slowest 5%
Last check: Failed; 42 min ago, next any minute now

Run a free test call How to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 42 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/pediatric_nexus_ii

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/pediatric_nexus_ii
content-type: application/json

{
  "items": [
    {
      "abnormal_behavior": false,
      "age": 10,
      "altered_alertness": false,
      "coagulopathy": false,
      "neurologic_deficit": false,
      "persistent_vomiting": false,
      "scalp_hematoma": false,
      "skull_fracture": false
    },
    {
      "abnormal_behavior": false,
      "age": 10,
      "altered_alertness": false,
      "coagulopathy": false,
      "neurologic_deficit": false,
      "persistent_vomiting": false,
      "scalp_hematoma": false,
      "skull_fracture": false
    }
  ]
}

Parameters

Parameter	Type	Required	Description
`items`	array of object	Yes

Example response

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

Example response, 96 lines

{
  "count": 2,
  "items": [
    {
      "age_years": 10,
      "citation": {
        "authors": "Gupta M, Mower WR, Rodriguez RM, Hendey GW",
        "doi": "10.1111/acem.13431",
        "id": "gupta-2018",
        "pmid": "29665151",
        "source": "Acad Emerg Med. 2018;25(7):729-737",
        "title": "Validation of the Pediatric NEXUS II Head Computed Tomography Decision Instrument for Selective Imaging of Pediatric Patients with Blunt Head Trauma."
      },
      "criteria": [
        {
          "factor": "no_skull_fracture",
          "met": true
        },
        {
          "factor": "no_scalp_hematoma",
          "met": true
        },
        {
          "factor": "no_neurologic_deficit",
          "met": true
        },
        {
          "factor": "no_altered_alertness",
          "met": true
        },
        {
          "factor": "no_abnormal_behavior",
          "met": true
        },
        {
          "factor": "no_persistent_vomiting",
          "met": true
        },
        {
          "factor": "no_coagulopathy",
          "met": 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.",
      "formula": "pediatric_nexus_ii",
      "formula_expression": "low_risk iff no skull_fracture and no scalp_hematoma and no neurologic_deficit and no altered_alertness and no abnormal_behavior and no persistent_vomiting and no coagulopathy",
      "low_risk": true
    },
    {
      "age_years": 10,
      "citation": {
        "authors": "Gupta M, Mower WR, Rodriguez RM, Hendey GW",
        "doi": "10.1111/acem.13431",
        "id": "gupta-2018",
        "pmid": "29665151",
        "source": "Acad Emerg Med. 2018;25(7):729-737",
        "title": "Validation of the Pediatric NEXUS II Head Computed Tomography Decision Instrument for Selective Imaging of Pediatric Patients with Blunt Head Trauma."
      },
      "criteria": [
        {
          "factor": "no_skull_fracture",
          "met": true
        },
        {
          "factor": "no_scalp_hematoma",
          "met": true
        },
        {
          "factor": "no_neurologic_deficit",
          "met": true
        },
        {
          "factor": "no_altered_alertness",
          "met": true
        },
        {
          "factor": "no_abnormal_behavior",
          "met": true
        },
        {
          "factor": "no_persistent_vomiting",
          "met": true
        },
        {
          "factor": "no_coagulopathy",
          "met": 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.",
      "formula": "pediatric_nexus_ii",
      "formula_expression": "low_risk iff no skull_fracture and no scalp_hematoma and no neurologic_deficit and no altered_alertness and no abnormal_behavior and no persistent_vomiting and no coagulopathy",
      "low_risk": true
    }
  ],
  "path": "/api/calc/pediatric_nexus_ii"
}

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/pediatric_nexus_ii' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"abnormal_behavior":false,"age":10,"altered_alertness":false,"coagulopathy":false,"neurologic_deficit":false,"persistent_vomiting":false,"scalp_hematoma":false,"skull_fracture":false},{"abnormal_behavior":false,"age":10,"altered_alertness":false,"coagulopathy":false,"neurologic_deficit":false,"persistent_vomiting":false,"scalp_hematoma":false,"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/pediatric_nexus_ii' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"abnormal_behavior":false,"age":10,"altered_alertness":false,"coagulopathy":false,"neurologic_deficit":false,"persistent_vomiting":false,"scalp_hematoma":false,"skull_fracture":false},{"abnormal_behavior":false,"age":10,"altered_alertness":false,"coagulopathy":false,"neurologic_deficit":false,"persistent_vomiting":false,"scalp_hematoma":false,"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%2Fpediatric_nexus_ii&method=POST
const res = await pay("https://api.magentlab.com/api/calc/pediatric_nexus_ii", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "abnormal_behavior": false,
        "age": 10,
        "altered_alertness": false,
        "coagulopathy": false,
        "neurologic_deficit": false,
        "persistent_vomiting": false,
        "scalp_hematoma": false,
        "skull_fracture": false
      },
      {
        "abnormal_behavior": false,
        "age": 10,
        "altered_alertness": false,
        "coagulopathy": false,
        "neurologic_deficit": false,
        "persistent_vomiting": false,
        "scalp_hematoma": false,
        "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/pediatric_nexus_ii",
        json={
            "items": [
                {
                    "abnormal_behavior": False,
                    "age": 10,
                    "altered_alertness": False,
                    "coagulopathy": False,
                    "neurologic_deficit": False,
                    "persistent_vomiting": False,
                    "scalp_hematoma": False,
                    "skull_fracture": False,
                },
                {
                    "abnormal_behavior": False,
                    "age": 10,
                    "altered_alertness": False,
                    "coagulopathy": False,
                    "neurologic_deficit": False,
                    "persistent_vomiting": False,
                    "scalp_hematoma": False,
                    "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

When	Result	HTTP	Time	Price
42 min ago	Timed out	-	-	-
6 h ago	Passed	402	231 ms	$0.007
10 h ago	Passed	402	1.5 s	$0.007
15 h ago	Passed	402	250 ms	$0.007
20 h ago	Passed	402	261 ms	$0.007

Show 10 older checks

24 h ago	Passed	402	601 ms	$0.007
29 h ago	Passed	402	146 ms	$0.007
33 h ago	Passed	402	224 ms	$0.007
37 h ago	Passed	402	148 ms	$0.007
41 h ago	Passed	402	222 ms	$0.007
45 h ago	Passed	402	150 ms	$0.007
2 days ago	Passed	402	833 ms	$0.007
2 days ago	Passed	402	159 ms	$0.007
2 days ago	Passed	402	157 ms	$0.007
3 days ago	Passed	402	153 ms	$0.007

History

11 Oct 2026	Price changed from $0.005 to $0.007

Trust score 69/ 100

Availability (30-day uptime)		29 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		5 / 15
Charges what it lists		0 / 10
Security scan		10 / 10
Verified owner		0 / 10

How the score works

Payment terms

Price: $0.007 per call
Listed at: $0.005 (charges more)
Token: USDC
Networks: Base
Pays to: 0x836B…9Ee2

Real usage

Paying agents: 2 in 30 days
Paid calls: 5 in 30 days
Last paid call: 4 days ago

Source: x402 Bazaar settlement data.

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Trust score

[![ToolVet trust score](https://toolvet.app/badge/calc-pediatric-nexus-ii.svg)](https://toolvet.app/s/calc-pediatric-nexus-ii)