67trust / 100

Calc 4peps

by magent in Other

x402 APIFailing, checked 2 h ago

Roy 2021 4PEPS Table 3: age <50 −2, 50–64 −1, ≥65 0; chronic respiratory disease −1; HR <80 −1; chest pain and acute dyspnea +1; male +2; estrogen treatment +2; prior VTE +2; syncope +2; 4-week immobility +2; SpO2 <95% +3; calf pain or unilateral edema +3; PE most likely +5. Max 22. Bands: very_low <0, low 0–5, moderate 6–12, high ≥13. Not imaging or D-dimer. magent does not examine the patient or decide PE most likely.

POST

https://api.magentlab.com/api/calc/4peps

Price: $0.007; per call in USDC
Uptime: 88.9%; last 30 days
Response time: 161 ms; 575 ms slowest 5%
Last check: Failed; 2 h ago, next any minute now

Run a free test call How to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 2 h ago: Timed out

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

How to call it

POST https://api.magentlab.com/api/calc/4peps

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/4peps
content-type: application/json

{
  "items": [
    {
      "age": 40,
      "calf_pain_or_unilateral_edema": false,
      "chest_pain_and_acute_dyspnea": false,
      "chronic_respiratory_disease": false,
      "heart_rate_bpm": 90,
      "hormonal_estrogenic_treatment": false,
      "immobility_4w": false,
      "pe_most_likely": false,
      "personal_history_vte": false,
      "sex": "female",
      "spo2_percent": 98,
      "syncope": false
    },
    {
      "age": 40,
      "calf_pain_or_unilateral_edema": false,
      "chest_pain_and_acute_dyspnea": false,
      "chronic_respiratory_disease": false,
      "heart_rate_bpm": 90,
      "hormonal_estrogenic_treatment": false,
      "immobility_4w": false,
      "pe_most_likely": false,
      "personal_history_vte": false,
      "sex": "female",
      "spo2_percent": 98,
      "syncope": 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, 170 lines

{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Roy PM, Friou E, Germeau B, et al.",
        "doi": "10.1001/jamacardio.2021.0064",
        "id": "roy-2021",
        "pmid": "33656522",
        "source": "JAMA Cardiol. 2021;6(6):669-677",
        "title": "Derivation and Validation of a 4-Level Clinical Pretest Probability Score for Suspected Pulmonary Embolism to Safely Decrease Imaging Testing"
      },
      "components": [
        {
          "factor": "age",
          "points": -2,
          "present": true,
          "value": 40
        },
        {
          "factor": "chronic_respiratory_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "heart_rate_bpm",
          "points": 0,
          "present": false,
          "value": 90
        },
        {
          "factor": "chest_pain_and_acute_dyspnea",
          "points": 0,
          "present": false
        },
        {
          "factor": "sex",
          "points": 0,
          "present": false,
          "value": "female"
        },
        {
          "factor": "hormonal_estrogenic_treatment",
          "points": 0,
          "present": false
        },
        {
          "factor": "personal_history_vte",
          "points": 0,
          "present": false
        },
        {
          "factor": "syncope",
          "points": 0,
          "present": false
        },
        {
          "factor": "immobility_4w",
          "points": 0,
          "present": false
        },
        {
          "factor": "spo2_percent",
          "points": 0,
          "present": false,
          "value": 98
        },
        {
          "factor": "calf_pain_or_unilateral_edema",
          "points": 0,
          "present": false
        },
        {
          "factor": "pe_most_likely",
          "points": 0,
          "present": false
        }
      ],
      "cpp": "very_low",
      "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": "4peps",
      "formula_expression": "4PEPS = age (<50 -2, 50-64 -1, ≥65 0) + chronic_respiratory_disease (-1) + heart_rate_bpm (<80 -1) + chest_pain_and_acute_dyspnea (1) + male (2) + hormonal_estrogenic_treatment (2) + personal_history_vte (2) + syncope (2) + immobility_4w (2) + spo2_percent (<95 3) + calf_pain_or_unilateral_edema (3) + pe_most_likely (5); Roy 2021 Table 3; cpp very_low <0, low 0-5, moderate 6-12, high ≥13; max 22 (age ≥65 plus all positive items; score may be negative)",
      "max_score": 22,
      "score": -2
    },
    {
      "citation": {
        "authors": "Roy PM, Friou E, Germeau B, et al.",
        "doi": "10.1001/jamacardio.2021.0064",
        "id": "roy-2021",
        "pmid": "33656522",
        "source": "JAMA Cardiol. 2021;6(6):669-677",
        "title": "Derivation and Validation of a 4-Level Clinical Pretest Probability Score for Suspected Pulmonary Embolism to Safely Decrease Imaging Testing"
      },
      "components": [
        {
          "factor": "age",
          "points": -2,
          "present": true,
          "value": 40
        },
        {
          "factor": "chronic_respiratory_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "heart_rate_bpm",
          "points": 0,
          "present": false,
          "value": 90
        },
        {
          "factor": "chest_pain_and_acute_dyspnea",
          "points": 0,
          "present": false
        },
        {
          "factor": "sex",
          "points": 0,
          "present": false,
          "value": "female"
        },
        {
          "factor": "hormonal_estrogenic_treatment",
          "points": 0,
          "present": false
        },
        {
          "factor": "personal_history_vte",
          "points": 0,
          "present": false
        },
        {
          "factor": "syncope",
          "points": 0,
          "present": false
        },
        {
          "factor": "immobility_4w",
          "points": 0,
          "present": false
        },
        {
          "factor": "spo2_percent",
          "points": 0,
          "present": false,
          "value": 98
        },
        {
          "factor": "calf_pain_or_unilateral_edema",
          "points": 0,
          "present": false
        },
        {
          "factor": "pe_most_likely",
          "points": 0,
          "present": false
        }
      ],
      "cpp": "very_low",
      "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": "4peps",
      "formula_expression": "4PEPS = age (<50 -2, 50-64 -1, ≥65 0) + chronic_respiratory_disease (-1) + heart_rate_bpm (<80 -1) + chest_pain_and_acute_dyspnea (1) + male (2) + hormonal_estrogenic_treatment (2) + personal_history_vte (2) + syncope (2) + immobility_4w (2) + spo2_percent (<95 3) + calf_pain_or_unilateral_edema (3) + pe_most_likely (5); Roy 2021 Table 3; cpp very_low <0, low 0-5, moderate 6-12, high ≥13; max 22 (age ≥65 plus all positive items; score may be negative)",
      "max_score": 22,
      "score": -2
    }
  ],
  "path": "/api/calc/4peps"
}

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/4peps' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":40,"calf_pain_or_unilateral_edema":false,"chest_pain_and_acute_dyspnea":false,"chronic_respiratory_disease":false,"heart_rate_bpm":90,"hormonal_estrogenic_treatment":false,"immobility_4w":false,"pe_most_likely":false,"personal_history_vte":false,"sex":"female","spo2_percent":98,"syncope":false},{"age":40,"calf_pain_or_unilateral_edema":false,"chest_pain_and_acute_dyspnea":false,"chronic_respiratory_disease":false,"heart_rate_bpm":90,"hormonal_estrogenic_treatment":false,"immobility_4w":false,"pe_most_likely":false,"personal_history_vte":false,"sex":"female","spo2_percent":98,"syncope":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/4peps' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"age":40,"calf_pain_or_unilateral_edema":false,"chest_pain_and_acute_dyspnea":false,"chronic_respiratory_disease":false,"heart_rate_bpm":90,"hormonal_estrogenic_treatment":false,"immobility_4w":false,"pe_most_likely":false,"personal_history_vte":false,"sex":"female","spo2_percent":98,"syncope":false},{"age":40,"calf_pain_or_unilateral_edema":false,"chest_pain_and_acute_dyspnea":false,"chronic_respiratory_disease":false,"heart_rate_bpm":90,"hormonal_estrogenic_treatment":false,"immobility_4w":false,"pe_most_likely":false,"personal_history_vte":false,"sex":"female","spo2_percent":98,"syncope":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%2F4peps&method=POST
const res = await pay("https://api.magentlab.com/api/calc/4peps", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "age": 40,
        "calf_pain_or_unilateral_edema": false,
        "chest_pain_and_acute_dyspnea": false,
        "chronic_respiratory_disease": false,
        "heart_rate_bpm": 90,
        "hormonal_estrogenic_treatment": false,
        "immobility_4w": false,
        "pe_most_likely": false,
        "personal_history_vte": false,
        "sex": "female",
        "spo2_percent": 98,
        "syncope": false
      },
      {
        "age": 40,
        "calf_pain_or_unilateral_edema": false,
        "chest_pain_and_acute_dyspnea": false,
        "chronic_respiratory_disease": false,
        "heart_rate_bpm": 90,
        "hormonal_estrogenic_treatment": false,
        "immobility_4w": false,
        "pe_most_likely": false,
        "personal_history_vte": false,
        "sex": "female",
        "spo2_percent": 98,
        "syncope": 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/4peps",
        json={
            "items": [
                {
                    "age": 40,
                    "calf_pain_or_unilateral_edema": False,
                    "chest_pain_and_acute_dyspnea": False,
                    "chronic_respiratory_disease": False,
                    "heart_rate_bpm": 90,
                    "hormonal_estrogenic_treatment": False,
                    "immobility_4w": False,
                    "pe_most_likely": False,
                    "personal_history_vte": False,
                    "sex": "female",
                    "spo2_percent": 98,
                    "syncope": False,
                },
                {
                    "age": 40,
                    "calf_pain_or_unilateral_edema": False,
                    "chest_pain_and_acute_dyspnea": False,
                    "chronic_respiratory_disease": False,
                    "heart_rate_bpm": 90,
                    "hormonal_estrogenic_treatment": False,
                    "immobility_4w": False,
                    "pe_most_likely": False,
                    "personal_history_vte": False,
                    "sex": "female",
                    "spo2_percent": 98,
                    "syncope": 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	Timed out	-	-	-
7 h ago	Timed out	-	-	-
12 h ago	Timed out	-	-	-
17 h ago	Timed out	-	-	-
22 h ago	Passed	402	161 ms	$0.007

Show 10 older checks

26 h ago	Passed	402	162 ms	$0.007
31 h ago	Passed	402	139 ms	$0.007
36 h ago	Passed	402	168 ms	$0.007
40 h ago	Passed	402	264 ms	$0.007
45 h ago	Passed	402	146 ms	$0.007
2 days ago	Passed	402	180 ms	$0.007
2 days ago	Passed	402	139 ms	$0.007
2 days ago	Passed	402	382 ms	$0.007
3 days ago	Passed	402	299 ms	$0.007
3 days ago	Passed	402	173 ms	$0.007

History

11 Oct 2026	Price changed from $0.005 to $0.007

Trust score 67/ 100

Availability (30-day uptime)		27 / 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: 5 days ago

Source: x402 Bazaar settlement data.

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Trust score

[![ToolVet trust score](https://toolvet.app/badge/calc-4peps.svg)](https://toolvet.app/s/calc-4peps)