ToolVet
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Calc Phenytoin Correction

by magent in Other

x402 APIPassing, checked 2 h ago

Sheiner–Tozer / Winter–Tozer albumin-adjusted total phenytoin: Ccorr = Cobs / ((0.2 or 0.1) × albumin_g_dl + 0.1). Renal factor 0.1 when renal_impairment is true. Deterministic published arithmetic with citation; not a free phenytoin level or a dose.

GET
https://api.magentlab.com/api/calc/phenytoin_correction
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
143 ms
372 ms slowest 5%
Last check
Passed
2 h ago, next in 4 h

Run a free test callHow to call it

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How to call it

GET https://api.magentlab.com/api/calc/phenytoin_correction

Each call costs $0.005 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://api.magentlab.com/api/calc/phenytoin_correction?albumin_g_dl=2&albumin_g_l=20&phenytoin_mcg_ml=8&renal_impairment=false

Parameters

ParameterTypeRequiredDescription
albumin_g_dlnumberNoSerum albumin in g/dL (1-6). Provide this or albumin_g_l.
albumin_g_lnumberNoSerum albumin in g/L (10-60). Converted as g/dL = g/L / 10.
phenytoin_mcg_mlnumberYesObserved total phenytoin in µg/mL (same as mg/L). Range 0.1-80.
renal_impairmentbooleanYestrue uses binding factor 0.1 (Liponi/Winter–Tozer end-stage renal adjustment). false uses 0.2. true or false.

Example response

The provider's example. We can't check it without paying.

{
  "albumin_g_dl": 2,
  "binding_factor": 0.2,
  "citation": {
    "authors": "Liponi DF, Winter ME, Tozer TN",
    "doi": "10.1212/WNL.34.3.395",
    "id": "liponi-1984",
    "source": "Neurology. 1984;34(3):395-397",
    "title": "Renal function and therapeutic concentrations of phenytoin"
  },
  "corrected_phenytoin_mcg_ml": 16,
  "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": "sheiner_tozer",
  "formula_expression": "corrected_phenytoin_mcg_ml = phenytoin_mcg_ml / ((binding_factor * albumin_g_dl) + 0.1); binding_factor 0.2, or 0.1 if renal_impairment",
  "phenytoin_mcg_ml": 8,
  "renal_impairment": false
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.magentlab.com/api/calc/phenytoin_correction?albumin_g_dl=2&albumin_g_l=20&phenytoin_mcg_ml=8&renal_impairment=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/phenytoin_correction?albumin_g_dl=2&albumin_g_l=20&phenytoin_mcg_ml=8&renal_impairment=false' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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%2Fphenytoin_correction
const res = await pay("https://api.magentlab.com/api/calc/phenytoin_correction?albumin_g_dl=2&albumin_g_l=20&phenytoin_mcg_ml=8&renal_impairment=false");
console.log(res.status, await res.text());
Python: pay and call
# 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/phenytoin_correction?albumin_g_dl=2&albumin_g_l=20&phenytoin_mcg_ml=8&renal_impairment=false")
    print(res.status_code, res.text)

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