Calc Rule Of Nines

{
  "count": 2,
  "items": [
    {
      "anterior_trunk": 1,
      "arm_left": 0,
      "arm_right": 0,
      "citation": {
        "authors": "Wallace AB",
        "doi": "10.1016/s0140-6736(51)91975-7",
        "id": "wallace-1951",
        "pmid": "14805109",
        "source": "Lancet. 1951;1(6653):501-504",
        "title": "The exposure treatment of burns"
      },
      "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": "rule_of_nines",
      "formula_expression": "tbsa_percent = head*9 + arm_left*9 + arm_right*9 + anterior_trunk*18 + posterior_trunk*18 + leg_left*18 + leg_right*18 + perineum*1 (Wallace 1951 adult percents; each factor is 0, 0.5, or 1)",
      "head": 0,
      "leg_left": 0,
      "leg_right": 0,
      "perineum": 0,
      "posterior_trunk": 0,
      "tbsa_percent": 18
    },
    {
      "anterior_trunk": 1,
      "arm_left": 0,
      "arm_right": 0,
      "citation": {
        "authors": "Wallace AB",
        "doi": "10.1016/s0140-6736(51)91975-7",
        "id": "wallace-1951",
        "pmid": "14805109",
        "source": "Lancet. 1951;1(6653):501-504",
        "title": "The exposure treatment of burns"
      },
      "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": "rule_of_nines",
      "formula_expression": "tbsa_percent = head*9 + arm_left*9 + arm_right*9 + anterior_trunk*18 + posterior_trunk*18 + leg_left*18 + leg_right*18 + perineum*1 (Wallace 1951 adult percents; each factor is 0, 0.5, or 1)",
      "head": 0,
      "leg_left": 0,
      "leg_right": 0,
      "perineum": 0,
      "posterior_trunk": 0,
      "tbsa_percent": 18
    }
  ],
  "path": "/api/calc/rule_of_nines"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.magentlab.com/api/calc/rule_of_nines' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"anterior_trunk":1,"arm_left":0,"arm_right":0,"head":0,"leg_left":0,"leg_right":0,"perineum":0,"posterior_trunk":0},{"anterior_trunk":1,"arm_left":0,"arm_right":0,"head":0,"leg_left":0,"leg_right":0,"perineum":0,"posterior_trunk":0}]}'

# 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/rule_of_nines' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"anterior_trunk":1,"arm_left":0,"arm_right":0,"head":0,"leg_left":0,"leg_right":0,"perineum":0,"posterior_trunk":0},{"anterior_trunk":1,"arm_left":0,"arm_right":0,"head":0,"leg_left":0,"leg_right":0,"perineum":0,"posterior_trunk":0}]}' \
  | 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%2Frule_of_nines&method=POST
const res = await pay("https://api.magentlab.com/api/calc/rule_of_nines", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "anterior_trunk": 1,
        "arm_left": 0,
        "arm_right": 0,
        "head": 0,
        "leg_left": 0,
        "leg_right": 0,
        "perineum": 0,
        "posterior_trunk": 0
      },
      {
        "anterior_trunk": 1,
        "arm_left": 0,
        "arm_right": 0,
        "head": 0,
        "leg_left": 0,
        "leg_right": 0,
        "perineum": 0,
        "posterior_trunk": 0
      }
    ]
  }),
});
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/rule_of_nines",
        json={
            "items": [
                {
                    "anterior_trunk": 1,
                    "arm_left": 0,
                    "arm_right": 0,
                    "head": 0,
                    "leg_left": 0,
                    "leg_right": 0,
                    "perineum": 0,
                    "posterior_trunk": 0,
                },
                {
                    "anterior_trunk": 1,
                    "arm_left": 0,
                    "arm_right": 0,
                    "head": 0,
                    "leg_left": 0,
                    "leg_right": 0,
                    "perineum": 0,
                    "posterior_trunk": 0,
                },
            ],
        },
    )
    print(res.status_code, res.text)