70trust / 100

Calc Prevail

x402 APIPassing, checked 5 h ago

Armstrong 2018 PREVAIL Cox linear predictor for overall survival in chemotherapy-naïve metastatic castration-resistant prostate cancer from albumin, ALP versus ULN, bone metastases under 10, hemoglobin, LDH versus ULN, NLR under 2.5, pain 0-1, liver metastases, ln(PSA), months from diagnosis, and enzalutamide versus placebo. Table 1 HRs as ln(HR). Not a 1-/2-/3-year OS percent (no published S0). magent does not read bone scans. Not a dose or treatment order.

POST

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

Price: $0.007; per call in USDC
Uptime: 100%; last 30 days
Response time: 157 ms; 470 ms slowest 5%
Last check: Passed; 5 h ago, next any minute now

Run a free test call How to call it

Reliability

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

How to call it

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

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/prevail
content-type: application/json

{
  "items": [
    {
      "albumin_g_dl": 4,
      "alp_below_uln": true,
      "bone_mets_lt_10": true,
      "hemoglobin_g_dl": 13,
      "ldh_below_uln": true,
      "months_since_diagnosis": 60,
      "nlr_lt_2_5": true,
      "no_liver_metastases": true,
      "pain_0_to_1": true,
      "psa_ng_ml": 20,
      "treatment_enzalutamide": true
    },
    {
      "albumin_g_dl": 4,
      "alp_below_uln": true,
      "bone_mets_lt_10": true,
      "hemoglobin_g_dl": 13,
      "ldh_below_uln": true,
      "months_since_diagnosis": 60,
      "nlr_lt_2_5": true,
      "no_liver_metastases": true,
      "pain_0_to_1": true,
      "psa_ng_ml": 20,
      "treatment_enzalutamide": true
    }
  ]
}

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, 58 lines

{
  "count": 2,
  "items": [
    {
      "albumin_g_dl": 4,
      "alp_below_uln": true,
      "bone_mets_lt_10": true,
      "citation": {
        "authors": "Armstrong AJ, Lin P, Higano CS, et al.",
        "doi": "10.1093/annonc/mdy406",
        "id": "armstrong-2018-prevail",
        "pmid": "30202945",
        "source": "Ann Oncol. 2018;29(11):2200-2209",
        "title": "Development and validation of a prognostic model for overall survival in chemotherapy-naïve men with metastatic castration-resistant prostate cancer"
      },
      "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": "prevail",
      "formula_expression": "lp = ln(0.71)*albumin_g_dl + ln(0.79)*alp_below_uln + ln(0.68)*bone_mets_lt_10 + ln(0.85)*hemoglobin_g_dl + ln(0.67)*ldh_below_uln + ln(0.69)*nlr_lt_2_5 + ln(0.77)*pain_0_to_1 + ln(0.49)*no_liver_metastases + ln(1.23)*ln(psa_ng_ml) + ln(0.997)*months_since_diagnosis + ln(0.68)*treatment_enzalutamide; Armstrong 2018 Table 1 multivariable HRs, β = ln(HR); A versus B codes A as 1; booleans contribute β when true else 0; no printed S0; not 1-/2-/3-year OS percents; not nomogram points; training-set tertiles unpublished as numeric cutoffs; chemotherapy-naïve mCRPC PREVAIL; magent does not read bone scans",
      "hemoglobin_g_dl": 13,
      "ldh_below_uln": true,
      "linear_predictor": -5.796122,
      "months_since_diagnosis": 60,
      "nlr_lt_2_5": true,
      "no_liver_metastases": true,
      "pain_0_to_1": true,
      "psa_ng_ml": 20,
      "risk_score": -5.796122,
      "treatment_enzalutamide": true
    },
    {
      "albumin_g_dl": 4,
      "alp_below_uln": true,
      "bone_mets_lt_10": true,
      "citation": {
        "authors": "Armstrong AJ, Lin P, Higano CS, et al.",
        "doi": "10.1093/annonc/mdy406",
        "id": "armstrong-2018-prevail",
        "pmid": "30202945",
        "source": "Ann Oncol. 2018;29(11):2200-2209",
        "title": "Development and validation of a prognostic model for overall survival in chemotherapy-naïve men with metastatic castration-resistant prostate cancer"
      },
      "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": "prevail",
      "formula_expression": "lp = ln(0.71)*albumin_g_dl + ln(0.79)*alp_below_uln + ln(0.68)*bone_mets_lt_10 + ln(0.85)*hemoglobin_g_dl + ln(0.67)*ldh_below_uln + ln(0.69)*nlr_lt_2_5 + ln(0.77)*pain_0_to_1 + ln(0.49)*no_liver_metastases + ln(1.23)*ln(psa_ng_ml) + ln(0.997)*months_since_diagnosis + ln(0.68)*treatment_enzalutamide; Armstrong 2018 Table 1 multivariable HRs, β = ln(HR); A versus B codes A as 1; booleans contribute β when true else 0; no printed S0; not 1-/2-/3-year OS percents; not nomogram points; training-set tertiles unpublished as numeric cutoffs; chemotherapy-naïve mCRPC PREVAIL; magent does not read bone scans",
      "hemoglobin_g_dl": 13,
      "ldh_below_uln": true,
      "linear_predictor": -5.796122,
      "months_since_diagnosis": 60,
      "nlr_lt_2_5": true,
      "no_liver_metastases": true,
      "pain_0_to_1": true,
      "psa_ng_ml": 20,
      "risk_score": -5.796122,
      "treatment_enzalutamide": true
    }
  ],
  "path": "/api/calc/prevail"
}

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/prevail' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"albumin_g_dl":4,"alp_below_uln":true,"bone_mets_lt_10":true,"hemoglobin_g_dl":13,"ldh_below_uln":true,"months_since_diagnosis":60,"nlr_lt_2_5":true,"no_liver_metastases":true,"pain_0_to_1":true,"psa_ng_ml":20,"treatment_enzalutamide":true},{"albumin_g_dl":4,"alp_below_uln":true,"bone_mets_lt_10":true,"hemoglobin_g_dl":13,"ldh_below_uln":true,"months_since_diagnosis":60,"nlr_lt_2_5":true,"no_liver_metastases":true,"pain_0_to_1":true,"psa_ng_ml":20,"treatment_enzalutamide":true}]}'

# 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/prevail' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"albumin_g_dl":4,"alp_below_uln":true,"bone_mets_lt_10":true,"hemoglobin_g_dl":13,"ldh_below_uln":true,"months_since_diagnosis":60,"nlr_lt_2_5":true,"no_liver_metastases":true,"pain_0_to_1":true,"psa_ng_ml":20,"treatment_enzalutamide":true},{"albumin_g_dl":4,"alp_below_uln":true,"bone_mets_lt_10":true,"hemoglobin_g_dl":13,"ldh_below_uln":true,"months_since_diagnosis":60,"nlr_lt_2_5":true,"no_liver_metastases":true,"pain_0_to_1":true,"psa_ng_ml":20,"treatment_enzalutamide":true}]}' \
  | 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%2Fprevail&method=POST
const res = await pay("https://api.magentlab.com/api/calc/prevail", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "albumin_g_dl": 4,
        "alp_below_uln": true,
        "bone_mets_lt_10": true,
        "hemoglobin_g_dl": 13,
        "ldh_below_uln": true,
        "months_since_diagnosis": 60,
        "nlr_lt_2_5": true,
        "no_liver_metastases": true,
        "pain_0_to_1": true,
        "psa_ng_ml": 20,
        "treatment_enzalutamide": true
      },
      {
        "albumin_g_dl": 4,
        "alp_below_uln": true,
        "bone_mets_lt_10": true,
        "hemoglobin_g_dl": 13,
        "ldh_below_uln": true,
        "months_since_diagnosis": 60,
        "nlr_lt_2_5": true,
        "no_liver_metastases": true,
        "pain_0_to_1": true,
        "psa_ng_ml": 20,
        "treatment_enzalutamide": true
      }
    ]
  }),
});
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/prevail",
        json={
            "items": [
                {
                    "albumin_g_dl": 4,
                    "alp_below_uln": True,
                    "bone_mets_lt_10": True,
                    "hemoglobin_g_dl": 13,
                    "ldh_below_uln": True,
                    "months_since_diagnosis": 60,
                    "nlr_lt_2_5": True,
                    "no_liver_metastases": True,
                    "pain_0_to_1": True,
                    "psa_ng_ml": 20,
                    "treatment_enzalutamide": True,
                },
                {
                    "albumin_g_dl": 4,
                    "alp_below_uln": True,
                    "bone_mets_lt_10": True,
                    "hemoglobin_g_dl": 13,
                    "ldh_below_uln": True,
                    "months_since_diagnosis": 60,
                    "nlr_lt_2_5": True,
                    "no_liver_metastases": True,
                    "pain_0_to_1": True,
                    "psa_ng_ml": 20,
                    "treatment_enzalutamide": True,
                },
            ],
        },
    )
    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
5 h ago	Passed	402	153 ms	$0.007
9 h ago	Passed	402	370 ms	$0.007
14 h ago	Passed	402	264 ms	$0.007
19 h ago	Passed	402	158 ms	$0.007
23 h ago	Passed	402	143 ms	$0.007

Show 10 older checks

28 h ago	Passed	402	137 ms	$0.007
32 h ago	Passed	402	147 ms	$0.007
36 h ago	Passed	402	311 ms	$0.007
40 h ago	Passed	402	282 ms	$0.007
45 h ago	Passed	402	178 ms	$0.007
2 days ago	Passed	402	655 ms	$0.007
2 days ago	Passed	402	357 ms	$0.007
2 days ago	Passed	402	159 ms	$0.007
3 days ago	Passed	402	143 ms	$0.007
3 days ago	Passed	402	147 ms	$0.007

History

11 Oct 2026	Price changed from $0.005 to $0.007

Trust score 70/ 100

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		5 / 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: 2 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-prevail.svg)](https://toolvet.app/s/calc-prevail)