WEDGE

CHADS2

Compute the CHADS2 stroke-risk score from discrete clinical flags.

WEDGE $0.005 USDC GET /api/calc/chads2

Markdown: /docs/chads2.md · Canonical: https://magentlab.com/docs/chads2

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Compute the CHADS2 stroke-risk score from discrete clinical flags.

When to use

When an agent needs the 2001 Gage CHADS2 total and must not invent points from a chart narrative.

When not to use

• Not a diagnosis and not an anticoagulation order or treatment recommendation.
• CHA2DS2-VASc superseded CHADS2 for many guidelines; magent still ships the 2001 score as published.
• Flags are caller-supplied booleans. magent does not infer CHF or stroke history from text.

Formula

CHADS2 = CHF 1 + hypertension 1 + age≥75 1 + diabetes 1 + stroke/TIA 2; max 6

Citation

Title

Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation

Authors

Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ

Source

JAMA. 2001;285(22):2864-2870

DOI

10.1001/jama.285.22.2864

Worked example

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/chads2?age=78&chf=false&hypertension=true&diabetes=true&stroke_tia=false

Full URL: https://api.magentlab.com/api/calc/chads2?age=78&chf=false&hypertension=true&diabetes=true&stroke_tia=false

x402 V2 curl

Expect HTTP 402 and a PAYMENT-REQUIRED header until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/chads2?age=78&chf=false&hypertension=true&diabetes=true&stroke_tia=false"

Cursor mcp.json

Intended config for @magent/mcp. This is not npm @x402/fetch (a payment fetch wrapper).

{
  "mcpServers": {
    "magent": {
      "args": [
        "-y",
        "@magent/mcp"
      ],
      "command": "npx",
      "env": {
        "X402_PRIVATE_KEY": "0xYOUR_SPENDING_KEY"
      }
    }
  }
}

Parameters

Bulk (POST)

POST the same path with a JSON items array. Price is n times the GET unit. Invalid items return HTTP 400 before settlement.

POST /api/calc/chads2 Max 25 unit_amount * n PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
• HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
• Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
• x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "age": "78",
      "chf": "false",
      "diabetes": "true",
      "hypertension": "true",
      "stroke_tia": "false"
    },
    {
      "age": "78",
      "chf": "false",
      "diabetes": "true",
      "hypertension": "true",
      "stroke_tia": "false"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/chads2",
  "items": [
    {
      "components": [
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 1,
          "present": true
        },
        {
          "value": 78,
          "factor": "age_ge_75",
          "points": 1,
          "present": true
        },
        {
          "factor": "diabetes",
          "points": 1,
          "present": true
        },
        {
          "factor": "stroke_tia",
          "points": 0,
          "present": false
        }
      ],
      "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.",
      "citation": {
        "authors": "Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ",
        "doi": "10.1001/jama.285.22.2864",
        "id": "gage-2001",
        "source": "JAMA. 2001;285(22):2864-2870",
        "title": "Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation"
      },
      "formula": "chads2",
      "formula_expression": "CHADS2 = CHF 1 + hypertension 1 + age≥75 1 + diabetes 1 + stroke/TIA 2; max 6",
      "age_years": 78,
      "max_score": 6,
      "score": 3
    },
    {
      "components": [
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "hypertension",
          "points": 1,
          "present": true
        },
        {
          "value": 78,
          "factor": "age_ge_75",
          "points": 1,
          "present": true
        },
        {
          "factor": "diabetes",
          "points": 1,
          "present": true
        },
        {
          "factor": "stroke_tia",
          "points": 0,
          "present": false
        }
      ],
      "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.",
      "citation": {
        "authors": "Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ",
        "doi": "10.1001/jama.285.22.2864",
        "id": "gage-2001",
        "source": "JAMA. 2001;285(22):2864-2870",
        "title": "Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation"
      },
      "formula": "chads2",
      "formula_expression": "CHADS2 = CHF 1 + hypertension 1 + age≥75 1 + diabetes 1 + stroke/TIA 2; max 6",
      "age_years": 78,
      "max_score": 6,
      "score": 3
    }
  ]
}

Response

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "components": [
    {
      "factor": "congestive_heart_failure",
      "points": 0,
      "present": false
    },
    {
      "factor": "hypertension",
      "points": 1,
      "present": true
    },
    {
      "value": 78,
      "factor": "age_ge_75",
      "points": 1,
      "present": true
    },
    {
      "factor": "diabetes",
      "points": 1,
      "present": true
    },
    {
      "factor": "stroke_tia",
      "points": 0,
      "present": false
    }
  ],
  "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.",
  "citation": {
    "authors": "Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ",
    "doi": "10.1001/jama.285.22.2864",
    "id": "gage-2001",
    "source": "JAMA. 2001;285(22):2864-2870",
    "title": "Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation"
  },
  "formula": "chads2",
  "formula_expression": "CHADS2 = CHF 1 + hypertension 1 + age≥75 1 + diabetes 1 + stroke/TIA 2; max 6",
  "age_years": 78,
  "max_score": 6,
  "score": 3
}

Errors

Related tools

• CHA2DS2-VASc — Compute the CHA2DS2-VASc stroke-risk score from discrete clinical flags.

Also searched as

• CHADS2
• CHADS₂
• Gage 2001 score
• AF stroke score

Payment

Required query parameters must be present and valid. Invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. Retry the same URL with PAYMENT-SIGNATURE. Settlement completes before the tool runs. Full handshake and shared payment errors: Payments.

Guarantees

• Invalid query parameters return HTTP 400 before settlement. You are not charged.
• Settlement finishes before the tool executes. Uncertain settlement fails closed (HTTP 503).
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are not persisted. Request logs store path without query.