71trust / 100

Calc Virsta

x402 APIPassing, checked 2 h ago

Tubiana 2016 VIRSTA from nine caller-assigned SAB flags plus CRP mg/L. Points: emboli 5, meningitis 5, device or previous IE 4 (one item), IVDU 4, native valve 3, persistent bacteremia 3, vertebral osteomyelitis 2, community/non-nosocomial 2, severe sepsis/shock 1, CRP >190 mg/L 1. Max 30. high_risk iff score ≥ 3. Not an endocarditis diagnosis.

POST

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

Price: $0.007; per call in USDC
Uptime: 100%; last 30 days
Response time: 168 ms; 905 ms slowest 5%
Last check: Passed; 2 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/virsta

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/virsta
content-type: application/json

{
  "items": [
    {
      "cerebral_or_peripheral_emboli": false,
      "community_or_non_nosocomial": false,
      "crp_mg_l": 50,
      "intracardiac_device_or_previous_ie": false,
      "iv_drug_use": false,
      "meningitis": false,
      "native_valve_disease": false,
      "persistent_bacteremia": false,
      "severe_sepsis_or_shock": false,
      "vertebral_osteomyelitis": false
    },
    {
      "cerebral_or_peripheral_emboli": false,
      "community_or_non_nosocomial": false,
      "crp_mg_l": 50,
      "intracardiac_device_or_previous_ie": false,
      "iv_drug_use": false,
      "meningitis": false,
      "native_valve_disease": false,
      "persistent_bacteremia": false,
      "severe_sepsis_or_shock": false,
      "vertebral_osteomyelitis": false
    }
  ]
}

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, 146 lines

{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Tubiana S, Duval X, Alla F, Selton-Suty C, Tattevin P, Delahaye F, Piroth L, Chirouze C, Lavigne JP, Erpelding ML, Hoen B, Vandenesch F, Iung B, Le Moing V",
        "doi": "10.1016/j.jinf.2016.02.003",
        "id": "tubiana-2016",
        "pmid": "26916042",
        "source": "J Infect. 2016;72(5):544-553",
        "title": "The VIRSTA score, a prediction score to estimate risk of infective endocarditis and determine priority for echocardiography in patients with Staphylococcus aureus bacteremia"
      },
      "components": [
        {
          "factor": "cerebral_or_peripheral_emboli",
          "points": 0,
          "present": false
        },
        {
          "factor": "meningitis",
          "points": 0,
          "present": false
        },
        {
          "factor": "intracardiac_device_or_previous_ie",
          "points": 0,
          "present": false
        },
        {
          "factor": "iv_drug_use",
          "points": 0,
          "present": false
        },
        {
          "factor": "native_valve_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "persistent_bacteremia",
          "points": 0,
          "present": false
        },
        {
          "factor": "vertebral_osteomyelitis",
          "points": 0,
          "present": false
        },
        {
          "factor": "community_or_non_nosocomial",
          "points": 0,
          "present": false
        },
        {
          "factor": "severe_sepsis_or_shock",
          "points": 0,
          "present": false
        },
        {
          "factor": "crp_gt_190",
          "points": 0,
          "present": false,
          "value": 50
        }
      ],
      "crp_mg_l": 50,
      "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": "virsta",
      "formula_expression": "VIRSTA = cerebral_or_peripheral_emboli (5 if present) + meningitis (5) + intracardiac_device_or_previous_ie (4) + iv_drug_use (4) + native_valve_disease (3) + persistent_bacteremia (3) + vertebral_osteomyelitis (2) + community_or_non_nosocomial (2) + severe_sepsis_or_shock (1) + (crp_mg_l > 190 → 1); Tubiana 2016 caller-assigned items; CRP cutoff is above 190 mg/L (not ≥190); intracardiac device or previous IE is one 4-point item; max 30; high_risk iff score ≥ 3",
      "high_risk": false,
      "max_score": 30,
      "score": 0
    },
    {
      "citation": {
        "authors": "Tubiana S, Duval X, Alla F, Selton-Suty C, Tattevin P, Delahaye F, Piroth L, Chirouze C, Lavigne JP, Erpelding ML, Hoen B, Vandenesch F, Iung B, Le Moing V",
        "doi": "10.1016/j.jinf.2016.02.003",
        "id": "tubiana-2016",
        "pmid": "26916042",
        "source": "J Infect. 2016;72(5):544-553",
        "title": "The VIRSTA score, a prediction score to estimate risk of infective endocarditis and determine priority for echocardiography in patients with Staphylococcus aureus bacteremia"
      },
      "components": [
        {
          "factor": "cerebral_or_peripheral_emboli",
          "points": 0,
          "present": false
        },
        {
          "factor": "meningitis",
          "points": 0,
          "present": false
        },
        {
          "factor": "intracardiac_device_or_previous_ie",
          "points": 0,
          "present": false
        },
        {
          "factor": "iv_drug_use",
          "points": 0,
          "present": false
        },
        {
          "factor": "native_valve_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "persistent_bacteremia",
          "points": 0,
          "present": false
        },
        {
          "factor": "vertebral_osteomyelitis",
          "points": 0,
          "present": false
        },
        {
          "factor": "community_or_non_nosocomial",
          "points": 0,
          "present": false
        },
        {
          "factor": "severe_sepsis_or_shock",
          "points": 0,
          "present": false
        },
        {
          "factor": "crp_gt_190",
          "points": 0,
          "present": false,
          "value": 50
        }
      ],
      "crp_mg_l": 50,
      "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": "virsta",
      "formula_expression": "VIRSTA = cerebral_or_peripheral_emboli (5 if present) + meningitis (5) + intracardiac_device_or_previous_ie (4) + iv_drug_use (4) + native_valve_disease (3) + persistent_bacteremia (3) + vertebral_osteomyelitis (2) + community_or_non_nosocomial (2) + severe_sepsis_or_shock (1) + (crp_mg_l > 190 → 1); Tubiana 2016 caller-assigned items; CRP cutoff is above 190 mg/L (not ≥190); intracardiac device or previous IE is one 4-point item; max 30; high_risk iff score ≥ 3",
      "high_risk": false,
      "max_score": 30,
      "score": 0
    }
  ],
  "path": "/api/calc/virsta"
}

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/virsta' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"cerebral_or_peripheral_emboli":false,"community_or_non_nosocomial":false,"crp_mg_l":50,"intracardiac_device_or_previous_ie":false,"iv_drug_use":false,"meningitis":false,"native_valve_disease":false,"persistent_bacteremia":false,"severe_sepsis_or_shock":false,"vertebral_osteomyelitis":false},{"cerebral_or_peripheral_emboli":false,"community_or_non_nosocomial":false,"crp_mg_l":50,"intracardiac_device_or_previous_ie":false,"iv_drug_use":false,"meningitis":false,"native_valve_disease":false,"persistent_bacteremia":false,"severe_sepsis_or_shock":false,"vertebral_osteomyelitis":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 - -X POST 'https://api.magentlab.com/api/calc/virsta' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"cerebral_or_peripheral_emboli":false,"community_or_non_nosocomial":false,"crp_mg_l":50,"intracardiac_device_or_previous_ie":false,"iv_drug_use":false,"meningitis":false,"native_valve_disease":false,"persistent_bacteremia":false,"severe_sepsis_or_shock":false,"vertebral_osteomyelitis":false},{"cerebral_or_peripheral_emboli":false,"community_or_non_nosocomial":false,"crp_mg_l":50,"intracardiac_device_or_previous_ie":false,"iv_drug_use":false,"meningitis":false,"native_valve_disease":false,"persistent_bacteremia":false,"severe_sepsis_or_shock":false,"vertebral_osteomyelitis":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 $0.007 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%2Fvirsta&method=POST
const res = await pay("https://api.magentlab.com/api/calc/virsta", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "cerebral_or_peripheral_emboli": false,
        "community_or_non_nosocomial": false,
        "crp_mg_l": 50,
        "intracardiac_device_or_previous_ie": false,
        "iv_drug_use": false,
        "meningitis": false,
        "native_valve_disease": false,
        "persistent_bacteremia": false,
        "severe_sepsis_or_shock": false,
        "vertebral_osteomyelitis": false
      },
      {
        "cerebral_or_peripheral_emboli": false,
        "community_or_non_nosocomial": false,
        "crp_mg_l": 50,
        "intracardiac_device_or_previous_ie": false,
        "iv_drug_use": false,
        "meningitis": false,
        "native_valve_disease": false,
        "persistent_bacteremia": false,
        "severe_sepsis_or_shock": false,
        "vertebral_osteomyelitis": 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 $0.007 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/virsta",
        json={
            "items": [
                {
                    "cerebral_or_peripheral_emboli": False,
                    "community_or_non_nosocomial": False,
                    "crp_mg_l": 50,
                    "intracardiac_device_or_previous_ie": False,
                    "iv_drug_use": False,
                    "meningitis": False,
                    "native_valve_disease": False,
                    "persistent_bacteremia": False,
                    "severe_sepsis_or_shock": False,
                    "vertebral_osteomyelitis": False,
                },
                {
                    "cerebral_or_peripheral_emboli": False,
                    "community_or_non_nosocomial": False,
                    "crp_mg_l": 50,
                    "intracardiac_device_or_previous_ie": False,
                    "iv_drug_use": False,
                    "meningitis": False,
                    "native_valve_disease": False,
                    "persistent_bacteremia": False,
                    "severe_sepsis_or_shock": False,
                    "vertebral_osteomyelitis": False,
                },
            ],
        },
    )
    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
2 h ago	Passed	402	271 ms	$0.007
7 h ago	Passed	402	175 ms	$0.007
11 h ago	Passed	402	174 ms	$0.007
16 h ago	Passed	402	159 ms	$0.007
21 h ago	Passed	402	162 ms	$0.007

Show 10 older checks

25 h ago	Passed	402	171 ms	$0.007
29 h ago	Passed	402	426 ms	$0.007
33 h ago	Passed	402	158 ms	$0.007
38 h ago	Passed	402	300 ms	$0.007
42 h ago	Passed	402	247 ms	$0.007
46 h ago	Passed	402	143 ms	$0.007
2 days ago	Passed	402	171 ms	$0.007
2 days ago	Passed	402	294 ms	$0.007
2 days ago	Passed	402	231 ms	$0.007
3 days ago	Passed	402	158 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: 6 in 30 days
Last paid call: 3 days ago

Source: x402 Bazaar settlement data.

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Trust score

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