# AUDIT-C

AUDIT-C

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/audit_c`
HTML: https://magentlab.com/docs/audit-c
Markdown: https://magentlab.com/docs/audit-c.md

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

## What it computes

Sum three caller-assigned Bush 1998 AUDIT-C integers (0-4) and return this paper's ≥3 and ≥4 screens.

## When to use

When an agent has already applied the Bush 1998 response tables and needs the published AUDIT-C total plus ≥3/≥4 screens, not later sex-specific cutoffs or the full 10-item AUDIT.

## When not to use

- Not a diagnosis of alcohol use disorder.
- frequency, typical_drinks, and binge_frequency are caller-assigned integers 0-4 using Bush 1998 response tables. magent does not map drink-count categories.
- Thresholds are this paper's ≥3 (sensitive) and ≥4 (more specific) for heavy drinking / active abuse or dependence in VA outpatients (mostly men). magent does not apply later men≥4 / women≥3 VA-primary-care cutoffs.
- Not the full 10-item AUDIT and not CIWA-Ar.

## Formula

```
AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12
```

## Citation

[The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking](https://doi.org/10.1001/archinte.158.16.1789)
Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA
Arch Intern Med. 1998;158(16):1789-1795
DOI: [10.1001/archinte.158.16.1789](https://doi.org/10.1001/archinte.158.16.1789)

## Worked example

### All items 0

Given: `binge_frequency=0, frequency=0, typical_drinks=0`

1. frequency 0 + typical_drinks 0 + binge_frequency 0
2. Score = 0


### 1 + 1 + 1

Given: `binge_frequency=1, frequency=1, typical_drinks=1`

1. Score = 3
2. screen_ge_3 true; screen_ge_4 false


### 2 + 1 + 1

Given: `binge_frequency=1, frequency=2, typical_drinks=1`

1. Score = 4
2. screen_ge_3 true; screen_ge_4 true


## Also searched as

- AUDIT-C
- AUDIT C
- alcohol use disorders identification test consumption
- Bush AUDIT-C
- AUDIT consumption questions
- brief AUDIT
- AUDIT-C score

## Parameters

- `frequency` (integer, required): Caller-assigned Bush 1998 AUDIT item 1 points (integer 0-4): how often the patient had a drink containing alcohol in the past year. magent does not map drink-count categories.
- `typical_drinks` (integer, required): Caller-assigned Bush 1998 AUDIT item 2 points (integer 0-4): how many drinks on a typical drinking day. magent does not map drink-count categories.
- `binge_frequency` (integer, required): Caller-assigned Bush 1998 AUDIT item 3 points (integer 0-4): how often six or more drinks on one occasion. magent does not map drink-count categories.

## 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.

Method: `POST /api/calc/audit_c`
Max items: 25
Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic)
Status: 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:

```json
{
  "items": [
    {
      "binge_frequency": "0",
      "frequency": "0",
      "typical_drinks": "0"
    },
    {
      "binge_frequency": "0",
      "frequency": "0",
      "typical_drinks": "0"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/audit-c

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/audit_c",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "frequency",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "typical_drinks",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "binge_frequency",
          "points": 0,
          "present": 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.",
      "citation": {
        "authors": "Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA",
        "doi": "10.1001/archinte.158.16.1789",
        "id": "bush-1998",
        "source": "Arch Intern Med. 1998;158(16):1789-1795",
        "title": "The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking"
      },
      "formula": "audit_c",
      "formula_expression": "AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12",
      "max_score": 12,
      "score": 0,
      "screen_ge_3": false,
      "screen_ge_4": false
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "frequency",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "typical_drinks",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "binge_frequency",
          "points": 0,
          "present": 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.",
      "citation": {
        "authors": "Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA",
        "doi": "10.1001/archinte.158.16.1789",
        "id": "bush-1998",
        "source": "Arch Intern Med. 1998;158(16):1789-1795",
        "title": "The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking"
      },
      "formula": "audit_c",
      "formula_expression": "AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12",
      "max_score": 12,
      "score": 0,
      "screen_ge_3": false,
      "screen_ge_4": false
    }
  ]
}
```

## Response fields

- `formula` (string): audit_c
- `formula_expression` (string): Exact expression used
- `score` (integer): AUDIT-C points 0-12
- `max_score` (integer): 12
- `screen_ge_3` (boolean): true iff score ≥ 3 (Bush 1998 sensitive threshold for heavy drinking / active abuse or dependence). Not a diagnosis.
- `screen_ge_4` (boolean): true iff score ≥ 4 (Bush 1998 more specific threshold). Not later sex-specific cutoffs.
- `components` (array): Per-item caller-assigned points
- `citation` (object): Bush et al. Arch Intern Med 1998 citation
- `disclaimer` (string): Not-a-device notice

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "components": [
    {
      "value": 0,
      "factor": "frequency",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "typical_drinks",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "binge_frequency",
      "points": 0,
      "present": 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.",
  "citation": {
    "authors": "Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA",
    "doi": "10.1001/archinte.158.16.1789",
    "id": "bush-1998",
    "source": "Arch Intern Med. 1998;158(16):1789-1795",
    "title": "The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking"
  },
  "formula": "audit_c",
  "formula_expression": "AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12",
  "max_score": 12,
  "score": 0,
  "screen_ge_3": false,
  "screen_ge_4": false
}
```

## Errors

- HTTP 400 `invalid_audit_c_item`: frequency, typical_drinks, and binge_frequency must each be an integer from 0 to 4 (caller-assigned Bush 1998 points). Returned before settlement; you are not charged.
- HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
- HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
- HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged.

Shared HTTP 402 and 503: https://magentlab.com/docs/payments

## Related tools

- [CAGE](https://magentlab.com/docs/cage) — Sum the four Ewing 1984 CAGE items and return whether two or more answers are affirmative.
- [Glasgow Coma Scale](https://magentlab.com/docs/gcs) — Compute the Glasgow Coma Scale as the sum of caller-assigned eye, verbal, and motor integers. The 1974 or 1976 edition is required.

## 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.

- GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall).
- HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote.
- Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering.
- Retry the same URL with PAYMENT-SIGNATURE (base64 JSON echoing accepted, payload, and extensions when present).
- Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402.

- offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront.
- offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization.

- not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search.

Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers).

Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments

Stdio MCP (one process per host): https://magentlab.com/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.
- 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.