Calc Rema

{
  "citation": {
    "authors": "Alvarez-Twose I, González-de-Olano D, Sánchez-Muñoz L, Matito A, Jara-Acevedo M, Teodosio C, García-Montero A, Morgado JM, Orfao A, Escribano L",
    "doi": "10.1159/000329856",
    "id": "alvarez-twose-2012",
    "pmid": "22042301",
    "source": "Int Arch Allergy Immunol. 2012;157(3):275-280 (Epub 2011 Oct 28)",
    "title": "Validation of the REMA score for predicting mast cell clonality and systemic mastocytosis in patients with systemic mast cell activation symptoms."
  },
  "clonality_likely": true,
  "components": [
    {
      "factor": "sex",
      "points": 1,
      "present": true,
      "value": "male"
    },
    {
      "factor": "tryptase_ug_l",
      "points": 2,
      "present": true,
      "value": 30
    },
    {
      "factor": "pruritus_hives_angioedema",
      "points": 1,
      "present": true
    },
    {
      "factor": "syncope_or_presyncope",
      "points": 3,
      "present": true
    }
  ],
  "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": "rema",
  "formula_expression": "REMA = sex (male +1, female −1) + tryptase_ug_l (<15 −1, 15–25 0, >25 +2) + pruritus_hives_angioedema (true −2, false +1) + syncope_or_presyncope (true +3, false 0); range −4 to +7; clonality_likely iff score >= 2 (Álvarez-Twose 2012)",
  "max_score": 7,
  "score": 7,
  "sex": "male",
  "tryptase_ug_l": 30
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.magentlab.com/api/calc/rema?pruritus_hives_angioedema=false&sex=male&syncope_or_presyncope=true&tryptase_ug_l=30'

# 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/rema?pruritus_hives_angioedema=false&sex=male&syncope_or_presyncope=true&tryptase_ug_l=30' \
  | 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%2Frema
const res = await pay("https://api.magentlab.com/api/calc/rema?pruritus_hives_angioedema=false&sex=male&syncope_or_presyncope=true&tryptase_ug_l=30");
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/rema?pruritus_hives_angioedema=false&sex=male&syncope_or_presyncope=true&tryptase_ug_l=30")
    print(res.status_code, res.text)