Respiratory · LIVE

Pack-years

Compute NCI pack-year smoking exposure as packs_per_day × years_smoked. Caller supplies packs per day or cigarettes per day (20 cigarettes = 1 pack) and years smoked.

LIVE $0.005 USDC GET /api/calc/pack_years

Markdown: /docs/pack-years.md · Canonical: https://magentlab.com/docs/pack-years

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

What it computes

Compute NCI pack-year smoking exposure as packs_per_day × years_smoked. Caller supplies packs per day or cigarettes per day (20 cigarettes = 1 pack) and years smoked.

When to use

When an agent already has packs per day or cigarettes per day and years smoked and must not take a smoking history interview, invent a pack size other than 20 cigarettes, or treat the product as a lung-cancer screening order.

When not to use

• Not a medical device. Not a lung-cancer screening order, COPD diagnosis, or sleep-apnea screen. magent does not take a smoking history interview.
• NCI pack year is packs per day times years smoked. Does not convert cigar, pipe, or other tobacco to pack-years.
• Provide packs_per_day (0-10, magent clamp) or cigarettes_per_day (0-200; 20 cigarettes = 1 pack), not both. years_smoked is 0-80 (magent clamp). NCI does not publish an input band.
• Does not return years since quit or current-versus-former status. Caller supplies the two NCI factors.

Formula

pack_years = packs_per_day × years_smoked

Citation

Title

NCI Dictionary of Cancer Terms: pack year

Authors

National Cancer Institute

Source

NCI Dictionaries

DOI

none

Worked example

Also searched as

• pack year
• pack-year
• smoking pack years
• cigarette pack years
• packs per day years smoked
• NCI pack year
• tobacco pack-years
• smoking exposure pack-years

Try

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

/api/calc/pack_years?packs_per_day=1&years_smoked=1

Full URL: https://api.magentlab.com/api/calc/pack_years?packs_per_day=1&years_smoked=1

Call

Expect HTTP 402 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/pack_years?packs_per_day=1&years_smoked=1"

Parameters

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/calc/pack_years Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
• 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": [
    {
      "packs_per_day": "1",
      "years_smoked": "1"
    },
    {
      "packs_per_day": "1",
      "years_smoked": "1"
    }
  ]
}

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/pack_years",
  "items": [
    {
      "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": "National Cancer Institute",
        "id": "nci-pack-year",
        "source": "NCI Dictionaries",
        "title": "NCI Dictionary of Cancer Terms: pack year"
      },
      "formula": "pack_years",
      "formula_expression": "pack_years = packs_per_day × years_smoked",
      "pack_years": 1.0,
      "packs_per_day": 1.0,
      "years_smoked": 1.0
    },
    {
      "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": "National Cancer Institute",
        "id": "nci-pack-year",
        "source": "NCI Dictionaries",
        "title": "NCI Dictionary of Cancer Terms: pack year"
      },
      "formula": "pack_years",
      "formula_expression": "pack_years = packs_per_day × years_smoked",
      "pack_years": 1.0,
      "packs_per_day": 1.0,
      "years_smoked": 1.0
    }
  ]
}

Response

Example JSON

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

{
  "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": "National Cancer Institute",
    "id": "nci-pack-year",
    "source": "NCI Dictionaries",
    "title": "NCI Dictionary of Cancer Terms: pack year"
  },
  "formula": "pack_years",
  "formula_expression": "pack_years = packs_per_day × years_smoked",
  "pack_years": 1.0,
  "packs_per_day": 1.0,
  "years_smoked": 1.0
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

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Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, 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. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

• HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
• exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
• HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.