Calc Macs

{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Body R, Carley S, McDowell G, et al.",
        "doi": "10.1136/heartjnl-2014-305564",
        "id": "body-2014",
        "pmid": "24780911",
        "source": "Heart. 2014;100(18):1462-1468",
        "title": "The Manchester Acute Coronary Syndromes (MACS) decision rule for suspected cardiac chest pain: derivation and external validation"
      },
      "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.",
      "ecg_ischaemia": false,
      "formula": "macs",
      "formula_expression": "p = 1/(1+e^(-λ)); λ = 0.068*a + 0.17*b + 1.75*c + 1.85*d + 1.72*e + 1.46*f + 0.92*g + 0.87*h - 4.83; a Roche Elecsys hs-cTnT ng/L; b ELISA H-FABP ng/mL; c ECG ischaemia 0/1; d sweating observed 0/1; e vomiting 0/1; f hypotension SBP<100 0/1; g worsening angina 0/1; h right-arm/shoulder radiation 0/1; very_low p<0.02, low 0.02<=p<0.05, moderate 0.05<=p<0.95, high p>=0.95 (Body 2014 Table 2 rounded values)",
      "h_fabp_ng_ml": 1,
      "hs_ctnt_ng_l": 3,
      "hypotension": false,
      "linear_predictor": -4.456,
      "macs_band": "very_low",
      "pain_radiation_right_arm_or_shoulder": false,
      "probability": 0.0115,
      "sweating_observed": false,
      "vomiting": false,
      "worsening_angina": false
    },
    {
      "citation": {
        "authors": "Body R, Carley S, McDowell G, et al.",
        "doi": "10.1136/heartjnl-2014-305564",
        "id": "body-2014",
        "pmid": "24780911",
        "source": "Heart. 2014;100(18):1462-1468",
        "title": "The Manchester Acute Coronary Syndromes (MACS) decision rule for suspected cardiac chest pain: derivation and external validation"
      },
      "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.",
      "ecg_ischaemia": false,
      "formula": "macs",
      "formula_expression": "p = 1/(1+e^(-λ)); λ = 0.068*a + 0.17*b + 1.75*c + 1.85*d + 1.72*e + 1.46*f + 0.92*g + 0.87*h - 4.83; a Roche Elecsys hs-cTnT ng/L; b ELISA H-FABP ng/mL; c ECG ischaemia 0/1; d sweating observed 0/1; e vomiting 0/1; f hypotension SBP<100 0/1; g worsening angina 0/1; h right-arm/shoulder radiation 0/1; very_low p<0.02, low 0.02<=p<0.05, moderate 0.05<=p<0.95, high p>=0.95 (Body 2014 Table 2 rounded values)",
      "h_fabp_ng_ml": 1,
      "hs_ctnt_ng_l": 3,
      "hypotension": false,
      "linear_predictor": -4.456,
      "macs_band": "very_low",
      "pain_radiation_right_arm_or_shoulder": false,
      "probability": 0.0115,
      "sweating_observed": false,
      "vomiting": false,
      "worsening_angina": false
    }
  ],
  "path": "/api/calc/macs"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.magentlab.com/api/calc/macs' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"ecg_ischaemia":false,"h_fabp_ng_ml":1,"hs_ctnt_ng_l":3,"hypotension":false,"pain_radiation_right_arm_or_shoulder":false,"sweating_observed":false,"vomiting":false,"worsening_angina":false},{"ecg_ischaemia":false,"h_fabp_ng_ml":1,"hs_ctnt_ng_l":3,"hypotension":false,"pain_radiation_right_arm_or_shoulder":false,"sweating_observed":false,"vomiting":false,"worsening_angina":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/macs' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"ecg_ischaemia":false,"h_fabp_ng_ml":1,"hs_ctnt_ng_l":3,"hypotension":false,"pain_radiation_right_arm_or_shoulder":false,"sweating_observed":false,"vomiting":false,"worsening_angina":false},{"ecg_ischaemia":false,"h_fabp_ng_ml":1,"hs_ctnt_ng_l":3,"hypotension":false,"pain_radiation_right_arm_or_shoulder":false,"sweating_observed":false,"vomiting":false,"worsening_angina":false}]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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%2Fmacs&method=POST
const res = await pay("https://api.magentlab.com/api/calc/macs", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "ecg_ischaemia": false,
        "h_fabp_ng_ml": 1,
        "hs_ctnt_ng_l": 3,
        "hypotension": false,
        "pain_radiation_right_arm_or_shoulder": false,
        "sweating_observed": false,
        "vomiting": false,
        "worsening_angina": false
      },
      {
        "ecg_ischaemia": false,
        "h_fabp_ng_ml": 1,
        "hs_ctnt_ng_l": 3,
        "hypotension": false,
        "pain_radiation_right_arm_or_shoulder": false,
        "sweating_observed": false,
        "vomiting": false,
        "worsening_angina": false
      }
    ]
  }),
});
console.log(res.status, await res.text());

# 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/macs",
        json={
            "items": [
                {
                    "ecg_ischaemia": False,
                    "h_fabp_ng_ml": 1,
                    "hs_ctnt_ng_l": 3,
                    "hypotension": False,
                    "pain_radiation_right_arm_or_shoulder": False,
                    "sweating_observed": False,
                    "vomiting": False,
                    "worsening_angina": False,
                },
                {
                    "ecg_ischaemia": False,
                    "h_fabp_ng_ml": 1,
                    "hs_ctnt_ng_l": 3,
                    "hypotension": False,
                    "pain_radiation_right_arm_or_shoulder": False,
                    "sweating_observed": False,
                    "vomiting": False,
                    "worsening_angina": False,
                },
            ],
        },
    )
    print(res.status_code, res.text)