71trust / 100

Calc Sickle Rbc Exchange

by magent in Other

x402 APIPassing, checked 4 h ago

Nadler 1962 adult blood volume plus exponential remaining-fraction washout (Y/Y0 = e^(−X)) for sickle RBC exchange replacement pRBC volume. FCR = target_hbs / initial_hbs; X = −ln(FCR). Caller supplies hematocrits and HbS percents. Optional approx units if unit_volume_ml is sent. Deterministic published arithmetic. Not an apheresis order or medical device.

POST

https://api.magentlab.com/api/calc/sickle_rbc_exchange

Price: $0.007; per call in USDC
Uptime: 100%; last 30 days
Response time: 148 ms; 307 ms slowest 5%
Last check: Passed; 4 h ago, next any minute now

Run a free test call How to call it

Reliability

All checks passedSome failedAll failedNot checked

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

How to call it

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

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/sickle_rbc_exchange
content-type: application/json

{
  "items": [
    {
      "height_cm": 170,
      "height_in": 66.92913385826772,
      "hematocrit_percent": 30,
      "initial_hbs_percent": 90,
      "replacement_hct_percent": 60,
      "sex": "male",
      "target_hbs_percent": 30,
      "unit_volume_ml": 350,
      "weight_kg": 70,
      "weight_lb": 154.32
    },
    {
      "height_cm": 170,
      "height_in": 66.92913385826772,
      "hematocrit_percent": 30,
      "initial_hbs_percent": 90,
      "replacement_hct_percent": 60,
      "sex": "male",
      "target_hbs_percent": 30,
      "unit_volume_ml": 350,
      "weight_kg": 70,
      "weight_lb": 154.32
    }
  ]
}

Parameters

Parameter	Type	Required	Description
`items`	array of object	Yes

Example response

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

Example response, 56 lines

{
  "count": 2,
  "items": [
    {
      "blood_volume_l": 4.66,
      "blood_volume_ml": 4660,
      "citation": {
        "authors": "Nadler SB, Hidalgo JH, Bloch T",
        "id": "nadler-1962",
        "pmid": "21936146",
        "source": "Surgery. 1962;51(2):224-232",
        "title": "Prediction of blood volume in normal human adults"
      },
      "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.",
      "fcr": 0.3333,
      "formula": "nadler_exponential_washout",
      "formula_expression": "TBV_L male = 0.3669 * H^3 + 0.03219 * W + 0.6041; female = 0.3561 * H^3 + 0.03308 * W + 0.1833 (H meters, W kg). patient_rbc_volume_ml = TBV_mL * hematocrit_percent/100. FCR = target_hbs_percent/initial_hbs_percent. X = -ln(FCR). replacement_prbc_ml = patient_rbc_volume_ml * X / (replacement_hct_percent/100)",
      "height_cm": 170,
      "hematocrit_percent": 30,
      "initial_hbs_percent": 90,
      "patient_rbc_volume_ml": 1398,
      "rbc_volumes_exchanged": 1.0986,
      "replacement_hct_percent": 60,
      "replacement_prbc_ml": 2559.8,
      "sex": "male",
      "target_hbs_percent": 30,
      "weight_kg": 70
    },
    {
      "blood_volume_l": 4.66,
      "blood_volume_ml": 4660,
      "citation": {
        "authors": "Nadler SB, Hidalgo JH, Bloch T",
        "id": "nadler-1962",
        "pmid": "21936146",
        "source": "Surgery. 1962;51(2):224-232",
        "title": "Prediction of blood volume in normal human adults"
      },
      "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.",
      "fcr": 0.3333,
      "formula": "nadler_exponential_washout",
      "formula_expression": "TBV_L male = 0.3669 * H^3 + 0.03219 * W + 0.6041; female = 0.3561 * H^3 + 0.03308 * W + 0.1833 (H meters, W kg). patient_rbc_volume_ml = TBV_mL * hematocrit_percent/100. FCR = target_hbs_percent/initial_hbs_percent. X = -ln(FCR). replacement_prbc_ml = patient_rbc_volume_ml * X / (replacement_hct_percent/100)",
      "height_cm": 170,
      "hematocrit_percent": 30,
      "initial_hbs_percent": 90,
      "patient_rbc_volume_ml": 1398,
      "rbc_volumes_exchanged": 1.0986,
      "replacement_hct_percent": 60,
      "replacement_prbc_ml": 2559.8,
      "sex": "male",
      "target_hbs_percent": 30,
      "weight_kg": 70
    }
  ],
  "path": "/api/calc/sickle_rbc_exchange"
}

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/sickle_rbc_exchange' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"height_cm":170,"height_in":66.92913385826772,"hematocrit_percent":30,"initial_hbs_percent":90,"replacement_hct_percent":60,"sex":"male","target_hbs_percent":30,"unit_volume_ml":350,"weight_kg":70,"weight_lb":154.32},{"height_cm":170,"height_in":66.92913385826772,"hematocrit_percent":30,"initial_hbs_percent":90,"replacement_hct_percent":60,"sex":"male","target_hbs_percent":30,"unit_volume_ml":350,"weight_kg":70,"weight_lb":154.32}]}'

# 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/sickle_rbc_exchange' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"height_cm":170,"height_in":66.92913385826772,"hematocrit_percent":30,"initial_hbs_percent":90,"replacement_hct_percent":60,"sex":"male","target_hbs_percent":30,"unit_volume_ml":350,"weight_kg":70,"weight_lb":154.32},{"height_cm":170,"height_in":66.92913385826772,"hematocrit_percent":30,"initial_hbs_percent":90,"replacement_hct_percent":60,"sex":"male","target_hbs_percent":30,"unit_volume_ml":350,"weight_kg":70,"weight_lb":154.32}]}' \
  | 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%2Fsickle_rbc_exchange&method=POST
const res = await pay("https://api.magentlab.com/api/calc/sickle_rbc_exchange", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "height_cm": 170,
        "height_in": 66.92913385826772,
        "hematocrit_percent": 30,
        "initial_hbs_percent": 90,
        "replacement_hct_percent": 60,
        "sex": "male",
        "target_hbs_percent": 30,
        "unit_volume_ml": 350,
        "weight_kg": 70,
        "weight_lb": 154.32
      },
      {
        "height_cm": 170,
        "height_in": 66.92913385826772,
        "hematocrit_percent": 30,
        "initial_hbs_percent": 90,
        "replacement_hct_percent": 60,
        "sex": "male",
        "target_hbs_percent": 30,
        "unit_volume_ml": 350,
        "weight_kg": 70,
        "weight_lb": 154.32
      }
    ]
  }),
});
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/sickle_rbc_exchange",
        json={
            "items": [
                {
                    "height_cm": 170,
                    "height_in": 66.92913385826772,
                    "hematocrit_percent": 30,
                    "initial_hbs_percent": 90,
                    "replacement_hct_percent": 60,
                    "sex": "male",
                    "target_hbs_percent": 30,
                    "unit_volume_ml": 350,
                    "weight_kg": 70,
                    "weight_lb": 154.32,
                },
                {
                    "height_cm": 170,
                    "height_in": 66.92913385826772,
                    "hematocrit_percent": 30,
                    "initial_hbs_percent": 90,
                    "replacement_hct_percent": 60,
                    "sex": "male",
                    "target_hbs_percent": 30,
                    "unit_volume_ml": 350,
                    "weight_kg": 70,
                    "weight_lb": 154.32,
                },
            ],
        },
    )
    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

When	Result	HTTP	Time	Price
4 h ago	Passed	402	162 ms	$0.007
9 h ago	Passed	402	146 ms	$0.007
14 h ago	Passed	402	155 ms	$0.007
18 h ago	Passed	402	231 ms	$0.007
23 h ago	Passed	402	330 ms	$0.007

Show 10 older checks

27 h ago	Passed	402	145 ms	$0.007
31 h ago	Passed	402	150 ms	$0.007
35 h ago	Passed	402	143 ms	$0.007
40 h ago	Passed	402	143 ms	$0.007
44 h ago	Passed	402	307 ms	$0.007
2 days ago	Passed	402	280 ms	$0.007
2 days ago	Passed	402	144 ms	$0.007
2 days ago	Passed	402	181 ms	$0.007
3 days ago	Passed	402	142 ms	$0.007
3 days ago	Passed	402	274 ms	$0.007

History

11 Oct 2026	Price changed from $0.005 to $0.007

Trust score 71/ 100

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		6 / 15
Charges what it lists		0 / 10
Security scan		10 / 10
Verified owner		0 / 10

How the score works

Payment terms

Price: $0.007 per call
Listed at: $0.005 (charges more)
Token: USDC
Networks: Base
Pays to: 0x836B…9Ee2

Real usage

Paying agents: 3 in 30 days
Paid calls: 5 in 30 days
Last paid call: 4 days ago

Source: x402 Bazaar settlement data.

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Trust score

[![ToolVet trust score](https://toolvet.app/badge/calc-sickle-rbc-exchange.svg)](https://toolvet.app/s/calc-sickle-rbc-exchange)