69trust / 100

Calc Parc

x402 APIFailing, checked 5 h ago

Kharbanda 2018 Table 3 pediatric appendicitis risk calculator (pARC): logistic probability from sex, age (5-18 years), pain duration, pain with walking, migration of pain to RLQ, maximal RLQ tenderness, abdominal guarding, and ANC (x10^3/uL; 1.77*sqrt(ANC) if <14, else constant 6.62). Returns logit and estimated_probability_percent. Not a medical device, not a diagnosis, not PAS, and not Alvarado. magent does not examine the child.

POST

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

Price: $0.007; per call in USDC
Uptime: 97.1%; last 30 days
Response time: 214 ms; 556 ms slowest 5%
Last check: Failed; 5 h ago, next any minute now

Run a free test call How to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 5 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/parc

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/parc
content-type: application/json

{
  "items": [
    {
      "abdominal_guarding": false,
      "age": 15,
      "anc_10e3_ul": 2,
      "maximal_tenderness_rlq": false,
      "pain_duration": "lt_24",
      "pain_migration_rlq": false,
      "pain_with_walking": false,
      "sex": "female"
    },
    {
      "abdominal_guarding": false,
      "age": 15,
      "anc_10e3_ul": 2,
      "maximal_tenderness_rlq": false,
      "pain_duration": "lt_24",
      "pain_migration_rlq": false,
      "pain_with_walking": false,
      "sex": "female"
    }
  ]
}

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, 54 lines

{
  "count": 2,
  "items": [
    {
      "abdominal_guarding": false,
      "age_years": 15,
      "anc_10e3_ul": 2,
      "citation": {
        "authors": "Kharbanda AB, Vazquez-Benitez G, Ballard DW, et al.",
        "doi": "10.1542/peds.2017-2699",
        "id": "kharbanda-2018",
        "pmid": "29535251",
        "source": "Pediatrics. 2018;141(4):e20172699",
        "title": "Development and Validation of a Novel Pediatric Appendicitis Risk Calculator (pARC)"
      },
      "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.",
      "estimated_probability": 0.002032,
      "estimated_probability_percent": 0.2,
      "formula": "parc",
      "formula_expression": "L = -8.7 + 1.28*male + age_sex + pain_duration + 1.05*pain_with_walking + 0.46*pain_migration_rlq + 1.14*maximal_tenderness_rlq + 0.67*abdominal_guarding + anc (Kharbanda 2018 Table 3); age 5-7.9 y 0.38; male 5-7.9 y -1.05; age 8-13.9 y -0.72 (male 8-13.9 y and female 8-11.9 y); reference = male 14-18 y and female 12-18 y; duration lt_24 0, 24_lt_48 0.47, 48_96 0.10; ANC <14 x10^3/uL: 1.77*sqrt(ANC); ANC >=14: 6.62 instead of the sqrt term; estimated_probability = 1 / (1 + exp(-L)); estimated_probability_percent = 100 * estimated_probability",
      "logit": -6.1968,
      "maximal_tenderness_rlq": false,
      "pain_duration": "lt_24",
      "pain_migration_rlq": false,
      "pain_with_walking": false,
      "sex": "female"
    },
    {
      "abdominal_guarding": false,
      "age_years": 15,
      "anc_10e3_ul": 2,
      "citation": {
        "authors": "Kharbanda AB, Vazquez-Benitez G, Ballard DW, et al.",
        "doi": "10.1542/peds.2017-2699",
        "id": "kharbanda-2018",
        "pmid": "29535251",
        "source": "Pediatrics. 2018;141(4):e20172699",
        "title": "Development and Validation of a Novel Pediatric Appendicitis Risk Calculator (pARC)"
      },
      "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.",
      "estimated_probability": 0.002032,
      "estimated_probability_percent": 0.2,
      "formula": "parc",
      "formula_expression": "L = -8.7 + 1.28*male + age_sex + pain_duration + 1.05*pain_with_walking + 0.46*pain_migration_rlq + 1.14*maximal_tenderness_rlq + 0.67*abdominal_guarding + anc (Kharbanda 2018 Table 3); age 5-7.9 y 0.38; male 5-7.9 y -1.05; age 8-13.9 y -0.72 (male 8-13.9 y and female 8-11.9 y); reference = male 14-18 y and female 12-18 y; duration lt_24 0, 24_lt_48 0.47, 48_96 0.10; ANC <14 x10^3/uL: 1.77*sqrt(ANC); ANC >=14: 6.62 instead of the sqrt term; estimated_probability = 1 / (1 + exp(-L)); estimated_probability_percent = 100 * estimated_probability",
      "logit": -6.1968,
      "maximal_tenderness_rlq": false,
      "pain_duration": "lt_24",
      "pain_migration_rlq": false,
      "pain_with_walking": false,
      "sex": "female"
    }
  ],
  "path": "/api/calc/parc"
}

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/parc' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"abdominal_guarding":false,"age":15,"anc_10e3_ul":2,"maximal_tenderness_rlq":false,"pain_duration":"lt_24","pain_migration_rlq":false,"pain_with_walking":false,"sex":"female"},{"abdominal_guarding":false,"age":15,"anc_10e3_ul":2,"maximal_tenderness_rlq":false,"pain_duration":"lt_24","pain_migration_rlq":false,"pain_with_walking":false,"sex":"female"}]}'

# 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/parc' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"abdominal_guarding":false,"age":15,"anc_10e3_ul":2,"maximal_tenderness_rlq":false,"pain_duration":"lt_24","pain_migration_rlq":false,"pain_with_walking":false,"sex":"female"},{"abdominal_guarding":false,"age":15,"anc_10e3_ul":2,"maximal_tenderness_rlq":false,"pain_duration":"lt_24","pain_migration_rlq":false,"pain_with_walking":false,"sex":"female"}]}' \
  | 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%2Fparc&method=POST
const res = await pay("https://api.magentlab.com/api/calc/parc", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "abdominal_guarding": false,
        "age": 15,
        "anc_10e3_ul": 2,
        "maximal_tenderness_rlq": false,
        "pain_duration": "lt_24",
        "pain_migration_rlq": false,
        "pain_with_walking": false,
        "sex": "female"
      },
      {
        "abdominal_guarding": false,
        "age": 15,
        "anc_10e3_ul": 2,
        "maximal_tenderness_rlq": false,
        "pain_duration": "lt_24",
        "pain_migration_rlq": false,
        "pain_with_walking": false,
        "sex": "female"
      }
    ]
  }),
});
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/parc",
        json={
            "items": [
                {
                    "abdominal_guarding": False,
                    "age": 15,
                    "anc_10e3_ul": 2,
                    "maximal_tenderness_rlq": False,
                    "pain_duration": "lt_24",
                    "pain_migration_rlq": False,
                    "pain_with_walking": False,
                    "sex": "female",
                },
                {
                    "abdominal_guarding": False,
                    "age": 15,
                    "anc_10e3_ul": 2,
                    "maximal_tenderness_rlq": False,
                    "pain_duration": "lt_24",
                    "pain_migration_rlq": False,
                    "pain_with_walking": False,
                    "sex": "female",
                },
            ],
        },
    )
    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
5 h ago	Timed out	-	-	-
9 h ago	Passed	402	160 ms	$0.007
14 h ago	Passed	402	317 ms	$0.007
19 h ago	Passed	402	163 ms	$0.007
23 h ago	Passed	402	380 ms	$0.007

Show 10 older checks

28 h ago	Passed	402	150 ms	$0.007
32 h ago	Passed	402	195 ms	$0.007
37 h ago	Passed	402	160 ms	$0.007
41 h ago	Passed	402	326 ms	$0.007
45 h ago	Passed	402	323 ms	$0.007
2 days ago	Passed	402	556 ms	$0.007
2 days ago	Passed	402	341 ms	$0.007
2 days ago	Passed	402	225 ms	$0.007
3 days ago	Passed	402	589 ms	$0.007
3 days ago	Passed	402	165 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-parc.svg)](https://toolvet.app/s/calc-parc)