ToolVet
68trust / 100

Calc Kegfr

by magent in Other

x402 APIFailing, checked just now

Chen 2013 kinetic eGFR (KeGFR) from two plasma creatinines, hours between them, caller-assigned steady-state creatinine and corresponding eGFR/CrCl, and required max_delta_pcr_mg_dl_day (Chen usual default 1.5). KeGFR = (SSPCr * CrCl / MeanPCr) * (1 - 24*dPCr / (dTime_hours * MaxdPCr/Day)), clamped at 0 when that (1 - ratio) term is negative. Creatinine mg/dL only. Not a CKD-EPI result. Not a dialysis prescription. magent does not compute MDRD or CKD-EPI.

POST
https://api.magentlab.com/api/calc/kegfr
Price
$0.007
per call in USDC
Uptime
94.1%
last 30 days
Response time
152 ms
525 ms slowest 5%
Last check
Failed
just now, next in 13 min

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed just now: Timed out

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://api.magentlab.com/api/calc/kegfr

Each call costs $0.007 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.

POST https://api.magentlab.com/api/calc/kegfr
content-type: application/json

{
  "items": [
    {
      "creatinine_1_mg_dl": 1,
      "creatinine_2_mg_dl": 1,
      "delta_hours": 24,
      "max_delta_pcr_mg_dl_day": 1.5,
      "steady_state_creatinine_mg_dl": 1,
      "steady_state_egfr": 90
    },
    {
      "creatinine_1_mg_dl": 1,
      "creatinine_2_mg_dl": 1,
      "delta_hours": 24,
      "max_delta_pcr_mg_dl_day": 1.5,
      "steady_state_creatinine_mg_dl": 1,
      "steady_state_egfr": 90
    }
  ]
}

Parameters

ParameterTypeRequiredDescription
itemsarray of objectYes

Example response

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

Example response, 52 lines
{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Chen S",
        "doi": "10.1681/ASN.2012070653",
        "id": "chen-2013",
        "pmid": "23704286",
        "source": "J Am Soc Nephrol. 2013;24(6):877-888",
        "title": "Retooling the Creatinine Clearance Equation to Estimate Kinetic GFR when the Plasma Creatinine Is Changing Acutely"
      },
      "creatinine_1_mg_dl": 1,
      "creatinine_2_mg_dl": 1,
      "delta_hours": 24,
      "delta_pcr_mg_dl": 0,
      "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": "kegfr",
      "formula_expression": "kegfr_ml_min = (steady_state_creatinine_mg_dl * steady_state_egfr / mean_pcr_mg_dl) * (1 - (24 * delta_pcr_mg_dl) / (delta_hours * max_delta_pcr_mg_dl_day)); mean_pcr_mg_dl = (creatinine_1_mg_dl + creatinine_2_mg_dl) / 2; delta_pcr_mg_dl = creatinine_2_mg_dl - creatinine_1_mg_dl; clamp kegfr_ml_min at 0 when (1 - ratio) is negative (Chen 2013)",
      "kegfr_ml_min": 90,
      "max_delta_pcr_mg_dl_day": 1.5,
      "mean_pcr_mg_dl": 1,
      "steady_state_creatinine_mg_dl": 1,
      "steady_state_egfr": 90,
      "units": "mL/min"
    },
    {
      "citation": {
        "authors": "Chen S",
        "doi": "10.1681/ASN.2012070653",
        "id": "chen-2013",
        "pmid": "23704286",
        "source": "J Am Soc Nephrol. 2013;24(6):877-888",
        "title": "Retooling the Creatinine Clearance Equation to Estimate Kinetic GFR when the Plasma Creatinine Is Changing Acutely"
      },
      "creatinine_1_mg_dl": 1,
      "creatinine_2_mg_dl": 1,
      "delta_hours": 24,
      "delta_pcr_mg_dl": 0,
      "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": "kegfr",
      "formula_expression": "kegfr_ml_min = (steady_state_creatinine_mg_dl * steady_state_egfr / mean_pcr_mg_dl) * (1 - (24 * delta_pcr_mg_dl) / (delta_hours * max_delta_pcr_mg_dl_day)); mean_pcr_mg_dl = (creatinine_1_mg_dl + creatinine_2_mg_dl) / 2; delta_pcr_mg_dl = creatinine_2_mg_dl - creatinine_1_mg_dl; clamp kegfr_ml_min at 0 when (1 - ratio) is negative (Chen 2013)",
      "kegfr_ml_min": 90,
      "max_delta_pcr_mg_dl_day": 1.5,
      "mean_pcr_mg_dl": 1,
      "steady_state_creatinine_mg_dl": 1,
      "steady_state_egfr": 90,
      "units": "mL/min"
    }
  ],
  "path": "/api/calc/kegfr"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.007.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.magentlab.com/api/calc/kegfr' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"creatinine_1_mg_dl":1,"creatinine_2_mg_dl":1,"delta_hours":24,"max_delta_pcr_mg_dl_day":1.5,"steady_state_creatinine_mg_dl":1,"steady_state_egfr":90},{"creatinine_1_mg_dl":1,"creatinine_2_mg_dl":1,"delta_hours":24,"max_delta_pcr_mg_dl_day":1.5,"steady_state_creatinine_mg_dl":1,"steady_state_egfr":90}]}'

# 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/kegfr' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"creatinine_1_mg_dl":1,"creatinine_2_mg_dl":1,"delta_hours":24,"max_delta_pcr_mg_dl_day":1.5,"steady_state_creatinine_mg_dl":1,"steady_state_egfr":90},{"creatinine_1_mg_dl":1,"creatinine_2_mg_dl":1,"delta_hours":24,"max_delta_pcr_mg_dl_day":1.5,"steady_state_creatinine_mg_dl":1,"steady_state_egfr":90}]}' \
  | 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 $0.007 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%2Fkegfr&method=POST
const res = await pay("https://api.magentlab.com/api/calc/kegfr", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "creatinine_1_mg_dl": 1,
        "creatinine_2_mg_dl": 1,
        "delta_hours": 24,
        "max_delta_pcr_mg_dl_day": 1.5,
        "steady_state_creatinine_mg_dl": 1,
        "steady_state_egfr": 90
      },
      {
        "creatinine_1_mg_dl": 1,
        "creatinine_2_mg_dl": 1,
        "delta_hours": 24,
        "max_delta_pcr_mg_dl_day": 1.5,
        "steady_state_creatinine_mg_dl": 1,
        "steady_state_egfr": 90
      }
    ]
  }),
});
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 $0.007 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/kegfr",
        json={
            "items": [
                {
                    "creatinine_1_mg_dl": 1,
                    "creatinine_2_mg_dl": 1,
                    "delta_hours": 24,
                    "max_delta_pcr_mg_dl_day": 1.5,
                    "steady_state_creatinine_mg_dl": 1,
                    "steady_state_egfr": 90,
                },
                {
                    "creatinine_1_mg_dl": 1,
                    "creatinine_2_mg_dl": 1,
                    "delta_hours": 24,
                    "max_delta_pcr_mg_dl_day": 1.5,
                    "steady_state_creatinine_mg_dl": 1,
                    "steady_state_egfr": 90,
                },
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

1 finding

  • Charges more than its listed price in payment
    Listed at $0.005, charges $0.007

Recent checks

WhenResultHTTPTimePrice
just nowTimed out---
5 h agoTimed out---
10 h agoPassed402150 ms$0.007
14 h agoPassed402246 ms$0.007
19 h agoPassed402142 ms$0.007
Show 10 older checks
24 h agoPassed402139 ms$0.007
28 h agoPassed402309 ms$0.007
33 h agoPassed402152 ms$0.007
37 h agoPassed402137 ms$0.007
41 h agoPassed402137 ms$0.007
45 h agoPassed402506 ms$0.007
2 days agoPassed402630 ms$0.007
2 days agoPassed402149 ms$0.007
2 days agoPassed402141 ms$0.007
3 days agoPassed402392 ms$0.007

History

11 Oct 2026Price changed from $0.005 to $0.007