ToolVet
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Calc Neonatal Partial Exchange

by magent in Other

x402 APIPassing, checked 2 h ago

Partial-exchange volume from Kumar 2004: volume_ml = (actual_hct_percent - 55) / actual_hct_percent * blood_volume_ml. Desired hematocrit is the trial's 55 percent only. Caller assigns blood volume; magent does not choose millilitres per kilogram or saline versus plasma. Not a transfusion order or indication (the trial found no long-term benefit in asymptomatic LBW). Deterministic published arithmetic with citation.

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

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How to call it

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

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/neonatal_partial_exchange?actual_hct_percent=70&blood_volume_ml=270

Parameters

ParameterTypeRequiredDescription
actual_hct_percentnumberYesActual hematocrit as percent (56-90). Must be above the trial desired 55.
blood_volume_mlnumberYesCaller-assigned blood volume in millilitres (40-600). magent does not choose millilitres per kilogram.

Example response

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

{
  "actual_hct_percent": 70,
  "blood_volume_ml": 270,
  "citation": {
    "authors": "Kumar A, Ramji S",
    "id": "kumar-2004",
    "pmid": "15123865",
    "source": "Indian Pediatr. 2004;41(4):366-372",
    "title": "Effect of partial exchange transfusion in asymptomatic polycythemic LBW babies"
  },
  "desired_hct_percent": 55,
  "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": "neonatal_partial_exchange",
  "formula_expression": "volume_ml = (actual_hct_percent - 55) / actual_hct_percent * blood_volume_ml",
  "volume_ml": 57.9
}

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/neonatal_partial_exchange?actual_hct_percent=70&blood_volume_ml=270'

# 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/neonatal_partial_exchange?actual_hct_percent=70&blood_volume_ml=270' \
  | 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%2Fneonatal_partial_exchange
const res = await pay("https://api.magentlab.com/api/calc/neonatal_partial_exchange?actual_hct_percent=70&blood_volume_ml=270");
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/neonatal_partial_exchange?actual_hct_percent=70&blood_volume_ml=270")
    print(res.status_code, res.text)

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Recent checks

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2 h agoPassed402320 ms$0.005
11 h agoPassed402233 ms$0.005
21 h agoPassed402483 ms$0.005
31 h agoPassed402207 ms$0.005
41 h agoPassed402225 ms$0.005
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2 days agoPassed402144 ms$0.005
3 days agoPassed402149 ms$0.005
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3 days agoPassed402134 ms$0.005
4 days agoPassed402230 ms$0.005
4 days agoPassed402138 ms$0.005