68trust / 100

Calc Jones

x402 APIFailing, checked 10 min ago

Gewitz 2015 AHA Jones criteria (Table 7). jones_arf iff evidence_of_preceding_gas and the episode rule: initial 2 major or 1 major plus 2 minor; recurrent also allows 3 minor. Majors/minors follow population_risk for arthritis vs arthralgia, fever, and ESR/CRP. Prolonged PR does not count with carditis. Joints count in major or minor, not both. magent does not examine the patient or read an echocardiogram. Not Jones 1944. Not a diagnosis. Not a medical device.

POST

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

Price: $0.007; per call in USDC
Uptime: 94.1%; last 30 days
Response time: 172 ms; 556 ms slowest 5%
Last check: Failed; 10 min ago, next in 5 min

Run a free test call How to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 10 min ago: Timed out

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

How to call it

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

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/jones
content-type: application/json

{
  "items": [
    {
      "carditis": true,
      "chorea": false,
      "episode": "initial",
      "erythema_marginatum": false,
      "esr_ge_30_or_crp_ge_3": false,
      "esr_ge_60_or_crp_ge_3": false,
      "evidence_of_preceding_gas": true,
      "fever_ge_38": false,
      "fever_ge_38_5": false,
      "monoarthralgia": false,
      "monoarthritis": false,
      "polyarthralgia": false,
      "polyarthritis": true,
      "population_risk": "low",
      "prolonged_pr": false,
      "subcutaneous_nodules": false
    },
    {
      "carditis": true,
      "chorea": false,
      "episode": "initial",
      "erythema_marginatum": false,
      "esr_ge_30_or_crp_ge_3": false,
      "esr_ge_60_or_crp_ge_3": false,
      "evidence_of_preceding_gas": true,
      "fever_ge_38": false,
      "fever_ge_38_5": false,
      "monoarthralgia": false,
      "monoarthritis": false,
      "polyarthralgia": false,
      "polyarthritis": true,
      "population_risk": "low",
      "prolonged_pr": false,
      "subcutaneous_nodules": 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, 174 lines

{
  "count": 2,
  "items": [
    {
      "citation": {
        "authors": "Gewitz MH, Baltimore RS, Tani LY, Sable CA, Shulman ST, Carapetis J, Remenyi B, Taubert KA, Bolger AF, Beerman L, Mayosi BM, Beaton A, Pandian NG, Kaplan EL",
        "doi": "10.1161/CIR.0000000000000205",
        "id": "gewitz-2015",
        "pmid": "25908771",
        "source": "Circulation. 2015;131(20):1806-1818",
        "title": "Revision of the Jones Criteria for the Diagnosis of Acute Rheumatic Fever in the Era of Doppler Echocardiography: A Scientific Statement From the American Heart Association"
      },
      "criteria": [
        {
          "factor": "evidence_of_preceding_gas",
          "met": true
        },
        {
          "factor": "carditis",
          "met": true
        },
        {
          "factor": "polyarthritis",
          "met": true
        },
        {
          "factor": "monoarthritis",
          "met": false
        },
        {
          "factor": "polyarthralgia",
          "met": false
        },
        {
          "factor": "monoarthralgia",
          "met": false
        },
        {
          "factor": "chorea",
          "met": false
        },
        {
          "factor": "erythema_marginatum",
          "met": false
        },
        {
          "factor": "subcutaneous_nodules",
          "met": false
        },
        {
          "factor": "fever_ge_38_5",
          "met": false
        },
        {
          "factor": "fever_ge_38",
          "met": false
        },
        {
          "factor": "esr_ge_60_or_crp_ge_3",
          "met": false
        },
        {
          "factor": "esr_ge_30_or_crp_ge_3",
          "met": false
        },
        {
          "factor": "prolonged_pr",
          "met": false
        },
        {
          "factor": "episode_rule",
          "met": true
        },
        {
          "factor": "jones_arf",
          "met": true
        }
      ],
      "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.",
      "episode": "initial",
      "formula": "jones",
      "formula_expression": "jones_arf iff evidence_of_preceding_gas and episode rule (Gewitz 2015 Table 7). initial: 2 major or (1 major and 2 minor). recurrent: 2 major or (1 major and 2 minor) or 3 minor. Majors: carditis (clinical and/or subclinical); arthritis (low: polyarthritis; moderate_high: polyarthritis or monoarthritis, else polyarthralgia); chorea; erythema_marginatum; subcutaneous_nodules. Minors: polyarthralgia (low, if no arthritis major); monoarthralgia (moderate_high, if no arthritis or polyarthralgia major); fever (low: fever_ge_38_5; moderate_high: fever_ge_38); ESR/CRP (low: esr_ge_60_or_crp_ge_3; moderate_high: esr_ge_30_or_crp_ge_3); prolonged_pr only when carditis is false. Joints count in major or minor, not both, at most one joint major. Not Jones 1944. Not a diagnosis",
      "jones_arf": true,
      "major_count": 2,
      "minor_count": 0,
      "population_risk": "low"
    },
    {
      "citation": {
        "authors": "Gewitz MH, Baltimore RS, Tani LY, Sable CA, Shulman ST, Carapetis J, Remenyi B, Taubert KA, Bolger AF, Beerman L, Mayosi BM, Beaton A, Pandian NG, Kaplan EL",
        "doi": "10.1161/CIR.0000000000000205",
        "id": "gewitz-2015",
        "pmid": "25908771",
        "source": "Circulation. 2015;131(20):1806-1818",
        "title": "Revision of the Jones Criteria for the Diagnosis of Acute Rheumatic Fever in the Era of Doppler Echocardiography: A Scientific Statement From the American Heart Association"
      },
      "criteria": [
        {
          "factor": "evidence_of_preceding_gas",
          "met": true
        },
        {
          "factor": "carditis",
          "met": true
        },
        {
          "factor": "polyarthritis",
          "met": true
        },
        {
          "factor": "monoarthritis",
          "met": false
        },
        {
          "factor": "polyarthralgia",
          "met": false
        },
        {
          "factor": "monoarthralgia",
          "met": false
        },
        {
          "factor": "chorea",
          "met": false
        },
        {
          "factor": "erythema_marginatum",
          "met": false
        },
        {
          "factor": "subcutaneous_nodules",
          "met": false
        },
        {
          "factor": "fever_ge_38_5",
          "met": false
        },
        {
          "factor": "fever_ge_38",
          "met": false
        },
        {
          "factor": "esr_ge_60_or_crp_ge_3",
          "met": false
        },
        {
          "factor": "esr_ge_30_or_crp_ge_3",
          "met": false
        },
        {
          "factor": "prolonged_pr",
          "met": false
        },
        {
          "factor": "episode_rule",
          "met": true
        },
        {
          "factor": "jones_arf",
          "met": true
        }
      ],
      "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.",
      "episode": "initial",
      "formula": "jones",
      "formula_expression": "jones_arf iff evidence_of_preceding_gas and episode rule (Gewitz 2015 Table 7). initial: 2 major or (1 major and 2 minor). recurrent: 2 major or (1 major and 2 minor) or 3 minor. Majors: carditis (clinical and/or subclinical); arthritis (low: polyarthritis; moderate_high: polyarthritis or monoarthritis, else polyarthralgia); chorea; erythema_marginatum; subcutaneous_nodules. Minors: polyarthralgia (low, if no arthritis major); monoarthralgia (moderate_high, if no arthritis or polyarthralgia major); fever (low: fever_ge_38_5; moderate_high: fever_ge_38); ESR/CRP (low: esr_ge_60_or_crp_ge_3; moderate_high: esr_ge_30_or_crp_ge_3); prolonged_pr only when carditis is false. Joints count in major or minor, not both, at most one joint major. Not Jones 1944. Not a diagnosis",
      "jones_arf": true,
      "major_count": 2,
      "minor_count": 0,
      "population_risk": "low"
    }
  ],
  "path": "/api/calc/jones"
}

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/jones' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"carditis":true,"chorea":false,"episode":"initial","erythema_marginatum":false,"esr_ge_30_or_crp_ge_3":false,"esr_ge_60_or_crp_ge_3":false,"evidence_of_preceding_gas":true,"fever_ge_38":false,"fever_ge_38_5":false,"monoarthralgia":false,"monoarthritis":false,"polyarthralgia":false,"polyarthritis":true,"population_risk":"low","prolonged_pr":false,"subcutaneous_nodules":false},{"carditis":true,"chorea":false,"episode":"initial","erythema_marginatum":false,"esr_ge_30_or_crp_ge_3":false,"esr_ge_60_or_crp_ge_3":false,"evidence_of_preceding_gas":true,"fever_ge_38":false,"fever_ge_38_5":false,"monoarthralgia":false,"monoarthritis":false,"polyarthralgia":false,"polyarthritis":true,"population_risk":"low","prolonged_pr":false,"subcutaneous_nodules":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/jones' \
  -H 'content-type: application/json' \
  --data-raw '{"items":[{"carditis":true,"chorea":false,"episode":"initial","erythema_marginatum":false,"esr_ge_30_or_crp_ge_3":false,"esr_ge_60_or_crp_ge_3":false,"evidence_of_preceding_gas":true,"fever_ge_38":false,"fever_ge_38_5":false,"monoarthralgia":false,"monoarthritis":false,"polyarthralgia":false,"polyarthritis":true,"population_risk":"low","prolonged_pr":false,"subcutaneous_nodules":false},{"carditis":true,"chorea":false,"episode":"initial","erythema_marginatum":false,"esr_ge_30_or_crp_ge_3":false,"esr_ge_60_or_crp_ge_3":false,"evidence_of_preceding_gas":true,"fever_ge_38":false,"fever_ge_38_5":false,"monoarthralgia":false,"monoarthritis":false,"polyarthralgia":false,"polyarthritis":true,"population_risk":"low","prolonged_pr":false,"subcutaneous_nodules":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%2Fjones&method=POST
const res = await pay("https://api.magentlab.com/api/calc/jones", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "items": [
      {
        "carditis": true,
        "chorea": false,
        "episode": "initial",
        "erythema_marginatum": false,
        "esr_ge_30_or_crp_ge_3": false,
        "esr_ge_60_or_crp_ge_3": false,
        "evidence_of_preceding_gas": true,
        "fever_ge_38": false,
        "fever_ge_38_5": false,
        "monoarthralgia": false,
        "monoarthritis": false,
        "polyarthralgia": false,
        "polyarthritis": true,
        "population_risk": "low",
        "prolonged_pr": false,
        "subcutaneous_nodules": false
      },
      {
        "carditis": true,
        "chorea": false,
        "episode": "initial",
        "erythema_marginatum": false,
        "esr_ge_30_or_crp_ge_3": false,
        "esr_ge_60_or_crp_ge_3": false,
        "evidence_of_preceding_gas": true,
        "fever_ge_38": false,
        "fever_ge_38_5": false,
        "monoarthralgia": false,
        "monoarthritis": false,
        "polyarthralgia": false,
        "polyarthritis": true,
        "population_risk": "low",
        "prolonged_pr": false,
        "subcutaneous_nodules": 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/jones",
        json={
            "items": [
                {
                    "carditis": True,
                    "chorea": False,
                    "episode": "initial",
                    "erythema_marginatum": False,
                    "esr_ge_30_or_crp_ge_3": False,
                    "esr_ge_60_or_crp_ge_3": False,
                    "evidence_of_preceding_gas": True,
                    "fever_ge_38": False,
                    "fever_ge_38_5": False,
                    "monoarthralgia": False,
                    "monoarthritis": False,
                    "polyarthralgia": False,
                    "polyarthritis": True,
                    "population_risk": "low",
                    "prolonged_pr": False,
                    "subcutaneous_nodules": False,
                },
                {
                    "carditis": True,
                    "chorea": False,
                    "episode": "initial",
                    "erythema_marginatum": False,
                    "esr_ge_30_or_crp_ge_3": False,
                    "esr_ge_60_or_crp_ge_3": False,
                    "evidence_of_preceding_gas": True,
                    "fever_ge_38": False,
                    "fever_ge_38_5": False,
                    "monoarthralgia": False,
                    "monoarthritis": False,
                    "polyarthralgia": False,
                    "polyarthritis": True,
                    "population_risk": "low",
                    "prolonged_pr": False,
                    "subcutaneous_nodules": 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
10 min ago	Timed out	-	-	-
5 h ago	Timed out	-	-	-
10 h ago	Passed	402	186 ms	$0.007
15 h ago	Passed	402	182 ms	$0.007
19 h ago	Passed	402	358 ms	$0.007

Show 10 older checks

24 h ago	Passed	402	144 ms	$0.007
29 h ago	Passed	402	149 ms	$0.007
33 h ago	Passed	402	318 ms	$0.007
37 h ago	Passed	402	289 ms	$0.007
41 h ago	Passed	402	185 ms	$0.007
45 h ago	Passed	402	155 ms	$0.007
2 days ago	Passed	402	171 ms	$0.007
2 days ago	Passed	402	150 ms	$0.007
2 days ago	Passed	402	175 ms	$0.007
3 days ago	Passed	402	920 ms	$0.007

History

11 Oct 2026	Price changed from $0.005 to $0.007

Trust score 68/ 100

Availability (30-day uptime)		28 / 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-jones.svg)](https://toolvet.app/s/calc-jones)