71trust / 100

Calc Tisdale

x402 APIPassing, checked 2 h ago

Tisdale 2013 QT prolongation risk score (Table 5): age ≥68 (1), female (1), loop diuretic (1), potassium ≤3.5 mmol/L (2), admission QTc ≥450 ms (2), acute MI (2), sepsis (3), heart failure (3), one QTc-prolonging drug (3) plus ≥2 drugs (3 stacked; max 21). Returns bands 0-6 / 7-10 / ≥11. Deterministic published arithmetic with citation; not a medical device, not a drug-stop protocol, and not a TdP diagnosis.

POST

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

Price: $0.007; per call in USDC
Uptime: 100%; last 30 days
Response time: 209 ms; 450 ms slowest 5%
Last check: Passed; 2 h 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/tisdale

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/tisdale
content-type: application/json

{
  "items": [
    {
      "acute_mi": false,
      "admission_qtc_ms": 400,
      "age": 60,
      "heart_failure": false,
      "loop_diuretic": false,
      "potassium_mmol_l": 4,
      "qtc_prolonging_drugs": 0,
      "sepsis": false,
      "sex": "male"
    },
    {
      "acute_mi": false,
      "admission_qtc_ms": 400,
      "age": 60,
      "heart_failure": false,
      "loop_diuretic": false,
      "potassium_mmol_l": 4,
      "qtc_prolonging_drugs": 0,
      "sepsis": false,
      "sex": "male"
    }
  ]
}

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, 162 lines

{
  "count": 2,
  "items": [
    {
      "admission_qtc_ms": 400,
      "age_years": 60,
      "citation": {
        "authors": "Tisdale JE, Jaynes HA, Kingery JR, et al.",
        "doi": "10.1161/CIRCOUTCOMES.113.000152",
        "id": "tisdale-2013",
        "pmid": "23716032",
        "source": "Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487",
        "title": "Development and validation of a risk score to predict QT interval prolongation in hospitalized patients"
      },
      "components": [
        {
          "factor": "age_ge_68",
          "points": 0,
          "present": false,
          "value": 60
        },
        {
          "factor": "female",
          "points": 0,
          "present": false
        },
        {
          "factor": "loop_diuretic",
          "points": 0,
          "present": false
        },
        {
          "factor": "potassium_le_3_5",
          "points": 0,
          "present": false,
          "value": 4
        },
        {
          "factor": "admission_qtc_ge_450",
          "points": 0,
          "present": false,
          "value": 400
        },
        {
          "factor": "acute_mi",
          "points": 0,
          "present": false
        },
        {
          "factor": "sepsis",
          "points": 0,
          "present": false
        },
        {
          "factor": "heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "one_qtc_prolonging_drug",
          "points": 0,
          "present": false,
          "value": 0
        },
        {
          "factor": "two_or_more_qtc_prolonging_drugs",
          "points": 0,
          "present": false,
          "value": 0
        }
      ],
      "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": "tisdale",
      "formula_expression": "Tisdale = age≥68 1 + female 1 + loop_diuretic 1 + potassium≤3.5 2 + admission_QTc≥450 2 + acute_MI 2 + sepsis 3 + heart_failure 3 + one_QTc_prolonging_drug 3 + ≥2_QTc_prolonging_drugs 3; Table 5; max 21; bands 0-6 / 7-10 / ≥11",
      "max_score": 21,
      "potassium_mmol_l": 4,
      "qtc_prolonging_drugs": 0,
      "score": 0,
      "sex": "male",
      "tisdale_band": "0-6"
    },
    {
      "admission_qtc_ms": 400,
      "age_years": 60,
      "citation": {
        "authors": "Tisdale JE, Jaynes HA, Kingery JR, et al.",
        "doi": "10.1161/CIRCOUTCOMES.113.000152",
        "id": "tisdale-2013",
        "pmid": "23716032",
        "source": "Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487",
        "title": "Development and validation of a risk score to predict QT interval prolongation in hospitalized patients"
      },
      "components": [
        {
          "factor": "age_ge_68",
          "points": 0,
          "present": false,
          "value": 60
        },
        {
          "factor": "female",
          "points": 0,
          "present": false
        },
        {
          "factor": "loop_diuretic",
          "points": 0,
          "present": false
        },
        {
          "factor": "potassium_le_3_5",
          "points": 0,
          "present": false,
          "value": 4
        },
        {
          "factor": "admission_qtc_ge_450",
          "points": 0,
          "present": false,
          "value": 400
        },
        {
          "factor": "acute_mi",
          "points": 0,
          "present": false
        },
        {
          "factor": "sepsis",
          "points": 0,
          "present": false
        },
        {
          "factor": "heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "one_qtc_prolonging_drug",
          "points": 0,
          "present": false,
          "value": 0
        },
        {
          "factor": "two_or_more_qtc_prolonging_drugs",
          "points": 0,
          "present": false,
          "value": 0
        }
      ],
      "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": "tisdale",
      "formula_expression": "Tisdale = age≥68 1 + female 1 + loop_diuretic 1 + potassium≤3.5 2 + admission_QTc≥450 2 + acute_MI 2 + sepsis 3 + heart_failure 3 + one_QTc_prolonging_drug 3 + ≥2_QTc_prolonging_drugs 3; Table 5; max 21; bands 0-6 / 7-10 / ≥11",
      "max_score": 21,
      "potassium_mmol_l": 4,
      "qtc_prolonging_drugs": 0,
      "score": 0,
      "sex": "male",
      "tisdale_band": "0-6"
    }
  ],
  "path": "/api/calc/tisdale"
}

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/tisdale' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"acute_mi":false,"admission_qtc_ms":400,"age":60,"heart_failure":false,"loop_diuretic":false,"potassium_mmol_l":4,"qtc_prolonging_drugs":0,"sepsis":false,"sex":"male"},{"acute_mi":false,"admission_qtc_ms":400,"age":60,"heart_failure":false,"loop_diuretic":false,"potassium_mmol_l":4,"qtc_prolonging_drugs":0,"sepsis":false,"sex":"male"}]}'

# 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/tisdale' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"acute_mi":false,"admission_qtc_ms":400,"age":60,"heart_failure":false,"loop_diuretic":false,"potassium_mmol_l":4,"qtc_prolonging_drugs":0,"sepsis":false,"sex":"male"},{"acute_mi":false,"admission_qtc_ms":400,"age":60,"heart_failure":false,"loop_diuretic":false,"potassium_mmol_l":4,"qtc_prolonging_drugs":0,"sepsis":false,"sex":"male"}]}' \
  | 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%2Ftisdale&method=POST
const res = await pay("https://api.magentlab.com/api/calc/tisdale", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "acute_mi": false,
        "admission_qtc_ms": 400,
        "age": 60,
        "heart_failure": false,
        "loop_diuretic": false,
        "potassium_mmol_l": 4,
        "qtc_prolonging_drugs": 0,
        "sepsis": false,
        "sex": "male"
      },
      {
        "acute_mi": false,
        "admission_qtc_ms": 400,
        "age": 60,
        "heart_failure": false,
        "loop_diuretic": false,
        "potassium_mmol_l": 4,
        "qtc_prolonging_drugs": 0,
        "sepsis": false,
        "sex": "male"
      }
    ]
  }),
});
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/tisdale",
        json={
            "items": [
                {
                    "acute_mi": False,
                    "admission_qtc_ms": 400,
                    "age": 60,
                    "heart_failure": False,
                    "loop_diuretic": False,
                    "potassium_mmol_l": 4,
                    "qtc_prolonging_drugs": 0,
                    "sepsis": False,
                    "sex": "male",
                },
                {
                    "acute_mi": False,
                    "admission_qtc_ms": 400,
                    "age": 60,
                    "heart_failure": False,
                    "loop_diuretic": False,
                    "potassium_mmol_l": 4,
                    "qtc_prolonging_drugs": 0,
                    "sepsis": False,
                    "sex": "male",
                },
            ],
        },
    )
    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
2 h ago	Passed	402	160 ms	$0.007
7 h ago	Passed	402	168 ms	$0.007
11 h ago	Passed	402	290 ms	$0.007
16 h ago	Passed	402	247 ms	$0.007
21 h ago	Passed	402	209 ms	$0.007

Show 10 older checks

25 h ago	Passed	402	235 ms	$0.007
29 h ago	Passed	402	392 ms	$0.007
33 h ago	Passed	402	164 ms	$0.007
38 h ago	Passed	402	449 ms	$0.007
42 h ago	Passed	402	238 ms	$0.007
46 h ago	Passed	402	449 ms	$0.007
2 days ago	Passed	402	143 ms	$0.007
2 days ago	Passed	402	228 ms	$0.007
2 days ago	Passed	402	223 ms	$0.007
3 days ago	Passed	402	150 ms	$0.007

History

11 Oct 2026	Price changed from $0.005 to $0.007

Trust score 71/ 100

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		6 / 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: 3 in 30 days
Paid calls: 6 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-tisdale.svg)](https://toolvet.app/s/calc-tisdale)