Calc Flamm Vbac

{
  "citation": {
    "authors": "Flamm BL, Geiger AM",
    "doi": "10.1016/S0029-7844(97)00531-0",
    "id": "flamm-1997",
    "pmid": "9397335",
    "source": "Obstet Gynecol. 1997;90(6):907-910",
    "title": "Vaginal birth after cesarean delivery: an admission scoring system"
  },
  "components": [
    {
      "factor": "age_lt_40",
      "points": 2,
      "present": true
    },
    {
      "factor": "vaginal_birth",
      "points": 0,
      "present": false,
      "value": "none"
    },
    {
      "factor": "non_ftp_indication",
      "points": 0,
      "present": false
    },
    {
      "factor": "effacement",
      "points": 0,
      "present": false,
      "value": "lt_25"
    },
    {
      "factor": "dilation_ge_4",
      "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": "flamm_vbac",
  "formula_expression": "Flamm VBAC = age_lt_40 2 + vaginal_birth (none 0, before_first_cesarean 1, after_first_cesarean 2, before_and_after 4) + non_ftp_indication 1 + effacement (gt_75 2, from_25_to_75 1, lt_25 0) + dilation_ge_4 1; Flamm 1997; max 10; published VBAC success 49% scores 0-2 and 95% scores 8-10",
  "max_score": 10,
  "score": 2,
  "vbac_success_percent": 49
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.magentlab.com/api/calc/flamm_vbac?age_lt_40=true&dilation_ge_4=false&effacement=lt_25&non_ftp_indication=false&vaginal_birth=none'

# 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/flamm_vbac?age_lt_40=true&dilation_ge_4=false&effacement=lt_25&non_ftp_indication=false&vaginal_birth=none' \
  | 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%2Fflamm_vbac
const res = await pay("https://api.magentlab.com/api/calc/flamm_vbac?age_lt_40=true&dilation_ge_4=false&effacement=lt_25&non_ftp_indication=false&vaginal_birth=none");
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/flamm_vbac?age_lt_40=true&dilation_ge_4=false&effacement=lt_25&non_ftp_indication=false&vaginal_birth=none")
    print(res.status_code, res.text)