Calc Rope

{
  "age_years": 70,
  "citation": {
    "authors": "Kent DM, Ruthazer R, Weimar C, Mas JL, Serena J, Homma S, Di Angelantonio E, Di Tullio MR, Lutz JS, Elkind MSV, Griffith J, Jaigobin C, Mattle HP, Michel P, Mono ML, Nedeltchev K, Papetti F, Thaler DE",
    "doi": "10.1212/WNL.0b013e3182a08d59",
    "id": "kent-2013",
    "pmid": "23864310",
    "source": "Neurology. 2013;81(7):619-625",
    "title": "An index to identify stroke-related vs incidental patent foramen ovale in cryptogenic stroke"
  },
  "components": [
    {
      "factor": "age",
      "points": 0,
      "present": false,
      "value": 70
    },
    {
      "factor": "no_hypertension",
      "points": 0,
      "present": false
    },
    {
      "factor": "no_diabetes",
      "points": 0,
      "present": false
    },
    {
      "factor": "no_prior_stroke_tia",
      "points": 0,
      "present": false
    },
    {
      "factor": "nonsmoker",
      "points": 0,
      "present": false
    },
    {
      "factor": "cortical_infarct",
      "points": 0,
      "present": false
    }
  ],
  "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": "rope",
  "formula_expression": "ROPE = age_points + no_hypertension 1 + no_diabetes 1 + no_prior_stroke_tia 1 + nonsmoker 1 + cortical_infarct 1; age 18-29 5, 30-39 4, 40-49 3, 50-59 2, 60-69 1, >=70 0; Kent 2013 Table 4; max 10",
  "max_score": 10,
  "rope_stratum": "0_to_3",
  "score": 0
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.magentlab.com/api/calc/rope?age=70&cortical_infarct=false&no_diabetes=false&no_hypertension=false&no_prior_stroke_tia=false&nonsmoker=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 - 'https://api.magentlab.com/api/calc/rope?age=70&cortical_infarct=false&no_diabetes=false&no_hypertension=false&no_prior_stroke_tia=false&nonsmoker=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 $0.005 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%2Frope
const res = await pay("https://api.magentlab.com/api/calc/rope?age=70&cortical_infarct=false&no_diabetes=false&no_hypertension=false&no_prior_stroke_tia=false&nonsmoker=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 $0.005 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.get("https://api.magentlab.com/api/calc/rope?age=70&cortical_infarct=false&no_diabetes=false&no_hypertension=false&no_prior_stroke_tia=false&nonsmoker=false")
    print(res.status_code, res.text)