78trust / 100

Calc 4c

by magent in Other

x402 APIPassing, checked 54 min ago

Knight 2020 ISARIC 4C Mortality Score: age (<50→0, 50–59→2, 60–69→4, 70–79→6, ≥80→7) + male 1 + comorbidity_count (0/1/≥2 → 0/1/2; caller-assigned Charlson-plus-obesity count) + RR (<20→0, 20–29→1, ≥30→2) + room-air SpO2 (<92→2) + GCS (<15→2) + urea (<7→0, 7–14→1, >14→3 mmol/L; or BUN/2.8) + CRP (<50→0, 50–99→1, ≥100→2). Max 21. Table 5: low 0–3, intermediate 4–8, high 9–14, very high ≥15. Not a COVID-19 diagnosis or treatment order.

POST

https://api.magentlab.com/api/calc/4c

Price: $0.005; per call in USDC
Uptime: 100%; last 30 days
Response time: 183 ms; 419 ms slowest 5%
Last check: Passed; 54 min ago, next any minute now

Run a free test call How to call it

Reliability

All checks passedSome failedAll failedNot checked

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

How to call it

POST https://api.magentlab.com/api/calc/4c

Each call costs $0.005 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/4c
content-type: application/json

{
  "items": [
    {
      "age": 40,
      "bun_mg_dl": 14,
      "comorbidity_count": 0,
      "crp_mg_l": 10,
      "gcs": 15,
      "respiratory_rate": 16,
      "sex": "female",
      "spo2_percent": 98,
      "urea_mmol_l": 5
    },
    {
      "age": 40,
      "bun_mg_dl": 14,
      "comorbidity_count": 0,
      "crp_mg_l": 10,
      "gcs": 15,
      "respiratory_rate": 16,
      "sex": "female",
      "spo2_percent": 98,
      "urea_mmol_l": 5
    }
  ]
}

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, 154 lines

{
  "count": 2,
  "items": [
    {
      "age_years": 40,
      "citation": {
        "authors": "Knight SR, Ho A, Pius R, Buchan I, Carson G, Drake TM, Dunning J, Fairfield CJ, Gamble C, Green CA, Gupta R, Halpin S, Hardwick HE, Holden KA, Horby PW, Jackson C, Mclean KA, Merson L, Nguyen-Van-Tam JS, Norman L, Noursadeghi M, Olliaro PL, Pritchard MG, Russell CD, Shaw CA, Sheikh A, Solomon T, Sudlow C, Swann OV, Turtle LCW, Openshaw PJM, Baillie JK, Semple MG, Docherty AB, Harrison EM; ISARIC4C investigators",
        "doi": "10.1136/bmj.m3339",
        "id": "knight-2020",
        "pmid": "32907855",
        "source": "BMJ. 2020;370:m3339",
        "title": "Risk stratification of patients admitted to hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: development and validation of the 4C Mortality Score"
      },
      "comorbidity_count": 0,
      "components": [
        {
          "factor": "age",
          "points": 0,
          "present": false,
          "value": 40
        },
        {
          "factor": "sex",
          "points": 0,
          "present": false,
          "value": "female"
        },
        {
          "factor": "comorbidity_count",
          "points": 0,
          "present": false,
          "value": 0
        },
        {
          "factor": "respiratory_rate",
          "points": 0,
          "present": false,
          "value": 16
        },
        {
          "factor": "spo2_percent",
          "points": 0,
          "present": false,
          "value": 98
        },
        {
          "factor": "gcs",
          "points": 0,
          "present": false,
          "value": 15
        },
        {
          "factor": "urea",
          "points": 0,
          "present": false,
          "value": 5
        },
        {
          "factor": "crp_mg_l",
          "points": 0,
          "present": false,
          "value": 10
        }
      ],
      "crp_mg_l": 10,
      "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": "4c",
      "formula_expression": "4C = age (<50 0, 50–59 2, 60–69 4, 70–79 6, ≥80 7) + sex (female 0, male 1) + comorbidity_count (0→0, 1→1, ≥2→2) + respiratory_rate (<20 0, 20–29 1, ≥30 2) + spo2_percent (≥92 0, <92 2) + gcs (15 0, <15 2) + urea_mmol_l (<7 0, 7–14 1, >14 3) + crp_mg_l (<50 0, 50–99 1, ≥100 2); Knight 2020 Table 2; max 21; Table 5 bands low 0–3, intermediate 4–8, high 9–14, very_high ≥15",
      "four_c_band": "low",
      "gcs": 15,
      "max_score": 21,
      "respiratory_rate": 16,
      "score": 0,
      "sex": "female",
      "spo2_percent": 98,
      "urea_mmol_l": 5
    },
    {
      "age_years": 40,
      "citation": {
        "authors": "Knight SR, Ho A, Pius R, Buchan I, Carson G, Drake TM, Dunning J, Fairfield CJ, Gamble C, Green CA, Gupta R, Halpin S, Hardwick HE, Holden KA, Horby PW, Jackson C, Mclean KA, Merson L, Nguyen-Van-Tam JS, Norman L, Noursadeghi M, Olliaro PL, Pritchard MG, Russell CD, Shaw CA, Sheikh A, Solomon T, Sudlow C, Swann OV, Turtle LCW, Openshaw PJM, Baillie JK, Semple MG, Docherty AB, Harrison EM; ISARIC4C investigators",
        "doi": "10.1136/bmj.m3339",
        "id": "knight-2020",
        "pmid": "32907855",
        "source": "BMJ. 2020;370:m3339",
        "title": "Risk stratification of patients admitted to hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: development and validation of the 4C Mortality Score"
      },
      "comorbidity_count": 0,
      "components": [
        {
          "factor": "age",
          "points": 0,
          "present": false,
          "value": 40
        },
        {
          "factor": "sex",
          "points": 0,
          "present": false,
          "value": "female"
        },
        {
          "factor": "comorbidity_count",
          "points": 0,
          "present": false,
          "value": 0
        },
        {
          "factor": "respiratory_rate",
          "points": 0,
          "present": false,
          "value": 16
        },
        {
          "factor": "spo2_percent",
          "points": 0,
          "present": false,
          "value": 98
        },
        {
          "factor": "gcs",
          "points": 0,
          "present": false,
          "value": 15
        },
        {
          "factor": "urea",
          "points": 0,
          "present": false,
          "value": 5
        },
        {
          "factor": "crp_mg_l",
          "points": 0,
          "present": false,
          "value": 10
        }
      ],
      "crp_mg_l": 10,
      "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": "4c",
      "formula_expression": "4C = age (<50 0, 50–59 2, 60–69 4, 70–79 6, ≥80 7) + sex (female 0, male 1) + comorbidity_count (0→0, 1→1, ≥2→2) + respiratory_rate (<20 0, 20–29 1, ≥30 2) + spo2_percent (≥92 0, <92 2) + gcs (15 0, <15 2) + urea_mmol_l (<7 0, 7–14 1, >14 3) + crp_mg_l (<50 0, 50–99 1, ≥100 2); Knight 2020 Table 2; max 21; Table 5 bands low 0–3, intermediate 4–8, high 9–14, very_high ≥15",
      "four_c_band": "low",
      "gcs": 15,
      "max_score": 21,
      "respiratory_rate": 16,
      "score": 0,
      "sex": "female",
      "spo2_percent": 98,
      "urea_mmol_l": 5
    }
  ],
  "path": "/api/calc/4c"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

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/4c' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":40,"bun_mg_dl":14,"comorbidity_count":0,"crp_mg_l":10,"gcs":15,"respiratory_rate":16,"sex":"female","spo2_percent":98,"urea_mmol_l":5},{"age":40,"bun_mg_dl":14,"comorbidity_count":0,"crp_mg_l":10,"gcs":15,"respiratory_rate":16,"sex":"female","spo2_percent":98,"urea_mmol_l":5}]}'

# 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/4c' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":40,"bun_mg_dl":14,"comorbidity_count":0,"crp_mg_l":10,"gcs":15,"respiratory_rate":16,"sex":"female","spo2_percent":98,"urea_mmol_l":5},{"age":40,"bun_mg_dl":14,"comorbidity_count":0,"crp_mg_l":10,"gcs":15,"respiratory_rate":16,"sex":"female","spo2_percent":98,"urea_mmol_l":5}]}' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.magentlab.com%2Fapi%2Fcalc%2F4c&method=POST
const res = await pay("https://api.magentlab.com/api/calc/4c", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "age": 40,
        "bun_mg_dl": 14,
        "comorbidity_count": 0,
        "crp_mg_l": 10,
        "gcs": 15,
        "respiratory_rate": 16,
        "sex": "female",
        "spo2_percent": 98,
        "urea_mmol_l": 5
      },
      {
        "age": 40,
        "bun_mg_dl": 14,
        "comorbidity_count": 0,
        "crp_mg_l": 10,
        "gcs": 15,
        "respiratory_rate": 16,
        "sex": "female",
        "spo2_percent": 98,
        "urea_mmol_l": 5
      }
    ]
  }),
});
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
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/4c",
        json={
            "items": [
                {
                    "age": 40,
                    "bun_mg_dl": 14,
                    "comorbidity_count": 0,
                    "crp_mg_l": 10,
                    "gcs": 15,
                    "respiratory_rate": 16,
                    "sex": "female",
                    "spo2_percent": 98,
                    "urea_mmol_l": 5,
                },
                {
                    "age": 40,
                    "bun_mg_dl": 14,
                    "comorbidity_count": 0,
                    "crp_mg_l": 10,
                    "gcs": 15,
                    "respiratory_rate": 16,
                    "sex": "female",
                    "spo2_percent": 98,
                    "urea_mmol_l": 5,
                },
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

When	Result	HTTP	Time	Price
54 min ago	Passed	402	144 ms	$0.005
6 h ago	Passed	402	494 ms	$0.005
10 h ago	Passed	402	177 ms	$0.005
15 h ago	Passed	402	270 ms	$0.005
19 h ago	Passed	402	340 ms	$0.005

Show 10 older checks

23 h ago	Passed	402	146 ms	$0.005
27 h ago	Passed	402	357 ms	$0.005
31 h ago	Passed	402	162 ms	$0.005
36 h ago	Passed	402	166 ms	$0.005
40 h ago	Passed	402	335 ms	$0.005
44 h ago	Passed	402	146 ms	$0.005
2 days ago	Passed	402	143 ms	$0.005
2 days ago	Passed	402	144 ms	$0.005
2 days ago	Passed	402	139 ms	$0.005
3 days ago	Passed	402	330 ms	$0.005

Trust score 78/ 100

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		3 / 15
Charges what it lists		10 / 10
Security scan		10 / 10
Verified owner		0 / 10

How the score works

Payment terms

Price: $0.005 per call
Listed at: $0.005
Token: USDC
Networks: Base
Pays to: 0x836B…9Ee2

Real usage

Paying agents: 1 in 30 days
Paid calls: 3 in 30 days
Last paid call: 4 days ago

Source: x402 Bazaar settlement data.

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Show the score

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Trust score

[![ToolVet trust score](https://toolvet.app/badge/calc-4c.svg)](https://toolvet.app/s/calc-4c)