ToolVet
71trust / 100

Calc Vancouver Chest Pain

by magent in Other

x402 APIPassing, checked 3 h ago

Christenson 2006 Vancouver Chest Pain Rule. early_discharge_eligible is true when the initial ECG is not abnormal, 2-hour troponin is not elevated, there is no prior ACS or nitrate use, and either palpation reproduces pain or age is under 40 without radiation to neck, arm, or jaw. Age 40 is not the age-history path. magent does not interpret ECGs or assay troponin. Not the 2014 age-50 variant. Not a medical device and not a discharge order.

POST
https://api.magentlab.com/api/calc/vancouver_chest_pain
Price
$0.007
per call in USDC
Uptime
100%
last 30 days
Response time
161 ms
391 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow 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/vancouver_chest_pain

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/vancouver_chest_pain
content-type: application/json

{
  "items": [
    {
      "abnormal_initial_ecg": false,
      "age": 35,
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    },
    {
      "abnormal_initial_ecg": false,
      "age": 35,
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    }
  ]
}

Parameters

ParameterTypeRequiredDescription
itemsarray of objectYes

Example response

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

Example response, 90 lines
{
  "count": 2,
  "items": [
    {
      "abnormal_initial_ecg": false,
      "age_years": 35,
      "citation": {
        "authors": "Christenson J, Innes G, McKnight D, et al.",
        "doi": "10.1016/j.annemergmed.2005.08.007",
        "id": "christenson-2006",
        "pmid": "16387209",
        "source": "Ann Emerg Med. 2006;47(1):1-10",
        "title": "A clinical prediction rule for early discharge of patients with chest pain"
      },
      "criteria": [
        {
          "factor": "normal_initial_ecg",
          "met": true,
          "value": false
        },
        {
          "factor": "troponin_2h_not_elevated",
          "met": true,
          "value": false
        },
        {
          "factor": "no_prior_acs_or_nitrate",
          "met": true,
          "value": false
        },
        {
          "factor": "palpation_or_age_history",
          "met": true,
          "value": 35
        }
      ],
      "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.",
      "early_discharge_eligible": true,
      "formula": "vancouver_chest_pain",
      "formula_expression": "early_discharge_eligible iff not abnormal_initial_ecg and not troponin_2h_elevated and not prior_acs_or_nitrate and (palpation_reproduces_pain or (age < 40 and not pain_radiates_neck_jaw_arm)); age 40 is not the age-history path (Christenson 2006 derivation tree; not Cullen 2014 / Scheuermeyer 2014 age 50)",
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    },
    {
      "abnormal_initial_ecg": false,
      "age_years": 35,
      "citation": {
        "authors": "Christenson J, Innes G, McKnight D, et al.",
        "doi": "10.1016/j.annemergmed.2005.08.007",
        "id": "christenson-2006",
        "pmid": "16387209",
        "source": "Ann Emerg Med. 2006;47(1):1-10",
        "title": "A clinical prediction rule for early discharge of patients with chest pain"
      },
      "criteria": [
        {
          "factor": "normal_initial_ecg",
          "met": true,
          "value": false
        },
        {
          "factor": "troponin_2h_not_elevated",
          "met": true,
          "value": false
        },
        {
          "factor": "no_prior_acs_or_nitrate",
          "met": true,
          "value": false
        },
        {
          "factor": "palpation_or_age_history",
          "met": true,
          "value": 35
        }
      ],
      "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.",
      "early_discharge_eligible": true,
      "formula": "vancouver_chest_pain",
      "formula_expression": "early_discharge_eligible iff not abnormal_initial_ecg and not troponin_2h_elevated and not prior_acs_or_nitrate and (palpation_reproduces_pain or (age < 40 and not pain_radiates_neck_jaw_arm)); age 40 is not the age-history path (Christenson 2006 derivation tree; not Cullen 2014 / Scheuermeyer 2014 age 50)",
      "pain_radiates_neck_jaw_arm": false,
      "palpation_reproduces_pain": false,
      "prior_acs_or_nitrate": false,
      "troponin_2h_elevated": false
    }
  ],
  "path": "/api/calc/vancouver_chest_pain"
}

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/vancouver_chest_pain' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"abnormal_initial_ecg":false,"age":35,"pain_radiates_neck_jaw_arm":false,"palpation_reproduces_pain":false,"prior_acs_or_nitrate":false,"troponin_2h_elevated":false},{"abnormal_initial_ecg":false,"age":35,"pain_radiates_neck_jaw_arm":false,"palpation_reproduces_pain":false,"prior_acs_or_nitrate":false,"troponin_2h_elevated":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/vancouver_chest_pain' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"abnormal_initial_ecg":false,"age":35,"pain_radiates_neck_jaw_arm":false,"palpation_reproduces_pain":false,"prior_acs_or_nitrate":false,"troponin_2h_elevated":false},{"abnormal_initial_ecg":false,"age":35,"pain_radiates_neck_jaw_arm":false,"palpation_reproduces_pain":false,"prior_acs_or_nitrate":false,"troponin_2h_elevated":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%2Fvancouver_chest_pain&method=POST
const res = await pay("https://api.magentlab.com/api/calc/vancouver_chest_pain", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "abnormal_initial_ecg": false,
        "age": 35,
        "pain_radiates_neck_jaw_arm": false,
        "palpation_reproduces_pain": false,
        "prior_acs_or_nitrate": false,
        "troponin_2h_elevated": false
      },
      {
        "abnormal_initial_ecg": false,
        "age": 35,
        "pain_radiates_neck_jaw_arm": false,
        "palpation_reproduces_pain": false,
        "prior_acs_or_nitrate": false,
        "troponin_2h_elevated": 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/vancouver_chest_pain",
        json={
            "items": [
                {
                    "abnormal_initial_ecg": False,
                    "age": 35,
                    "pain_radiates_neck_jaw_arm": False,
                    "palpation_reproduces_pain": False,
                    "prior_acs_or_nitrate": False,
                    "troponin_2h_elevated": False,
                },
                {
                    "abnormal_initial_ecg": False,
                    "age": 35,
                    "pain_radiates_neck_jaw_arm": False,
                    "palpation_reproduces_pain": False,
                    "prior_acs_or_nitrate": False,
                    "troponin_2h_elevated": 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
3 h agoPassed402146 ms$0.007
8 h agoPassed402155 ms$0.007
13 h agoPassed402169 ms$0.007
17 h agoPassed402229 ms$0.007
22 h agoPassed402144 ms$0.007
Show 10 older checks
26 h agoPassed402291 ms$0.007
31 h agoPassed402160 ms$0.007
34 h agoPassed402154 ms$0.007
39 h agoPassed402288 ms$0.007
43 h agoPassed402180 ms$0.007
47 h agoPassed402150 ms$0.007
2 days agoPassed402157 ms$0.007
2 days agoPassed402241 ms$0.007
3 days agoPassed402152 ms$0.007
3 days agoPassed402253 ms$0.007

History

11 Oct 2026Price changed from $0.005 to $0.007