# MAGGIC heart-failure integer score

MAGGIC

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

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

## What it computes

Sum the Pocock 2013 MAGGIC integer chart from thirteen caller-supplied heart-failure predictors and return the published Table 4 1-year and 3-year death probabilities for scores 0-50.

## When to use

When an agent already has age, EF, NYHA class, creatinine, diabetes, beta-blocker and ACEI/ARB prescription, SBP, BMI, time since HF diagnosis, smoking, COPD, and sex and needs the published integer score, not a diagnosis, a treatment order, or a reason to withhold therapy.

## When not to use

- Not a medical device and not a diagnosis. magent does not examine the patient, read an echocardiogram, assay creatinine, or prescribe therapy.
- Not a prognosis to withhold therapy. The integer score and Table 4 probabilities are published mappings, not a treatment order.
- Age and SBP extras follow the published integer chart rows that depend on EF. Those interactions are not dropped.
- Creatinine uses the Figure 2 µmol/L bins (Table 2 typesets mmol/L; the published values are µmol/L). magent does not compute eGFR.
- bmi_kg_m2 is caller-supplied. magent does not compute BMI from height and weight.
- Table 4 publishes 1-year and 3-year death probabilities for integer scores 0-50 only. Scores above 50 have no percentage in that table.
- Not NYHA class alone, not ACC/AHA HF stages, and not Framingham concurrent HF criteria.

## Formula

```
MAGGIC integer score (Pocock 2013 Figure 2): EF <20 7, 20-24 6, 25-29 5, 30-34 3, 35-39 2, >=40 0; age extra by EF (<30 / 30-39 / >=40): <55 0/0/0, 55-59 1/2/3, 60-64 2/4/5, 65-69 4/6/7, 70-74 6/8/9, 75-79 8/10/12, >=80 10/13/15; SBP extra by EF: <110 5/3/2, 110-119 4/2/1, 120-129 3/1/1, 130-139 2/1/0, 140-149 1/0/0, >=150 0/0/0; BMI <15 6, 15-19 5, 20-24 3, 25-29 2, >=30 0; creatinine umol/L <90 0, 90-109 1, 110-129 2, 130-149 3, 150-169 4, 170-209 5, 210-249 6, >=250 8; NYHA I 0, II 2, III 6, IV 8; male 1; current smoker 1; diabetes 3; COPD 2; HF duration >18 months 2; not prescribed beta-blocker 3; not prescribed ACEI/ARB 1; Table 4 1-year and 3-year death probabilities for scores 0-50
```

## Citation

[Predicting survival in heart failure: a risk score based on 39 372 patients from 30 studies](https://doi.org/10.1093/eurheartj/ehs337)
Pocock SJ, Ariti CA, McMurray JJV, Maggioni A, Køber L, Squire IB, Swedberg K, Dobson J, Poppe KK, Whalley GA, Doughty RN
Eur Heart J. 2013;34(19):1404-1413
DOI: [10.1093/eurheartj/ehs337](https://doi.org/10.1093/eurheartj/ehs337)

## Worked example

### Young, high EF, NYHA I, treated, remaining factors at lowest integer row

Given: `acei_arb=true, age=50, beta_blocker=true, bmi_kg_m2=30, copd=false, creatinine_umol_l=80, current_smoker=false, diabetes=false, ef_percent=55, hf_duration_gt_18_months=false, nyha_class=1, sex=female, systolic_mm_hg=150`

1. age 50 (<55) → 0 (any EF row)
2. EF 55 (>=40) → 0
3. NYHA I → 0
4. creatinine 80 µmol/L (<90) → 0
5. diabetes false → 0
6. beta-blocker prescribed → 0
7. SBP 150 (>=150, EF >=40) → 0
8. BMI 30 (>=30) → 0
9. HF duration not >18 months → 0
10. not a current smoker → 0
11. COPD false → 0
12. female → 0
13. ACEI/ARB prescribed → 0
14. score = 0
15. Table 4: 1-year 0.015, 3-year 0.039


## Also searched as

- MAGGIC score
- MAGGIC heart failure risk
- Meta-Analysis Global Group in Chronic Heart Failure
- Pocock 2013 heart failure score
- HF integer risk score
- MAGGIC 1-year mortality
- MAGGIC 3-year mortality

## Parameters

- `age` (integer, required): Age in years (integer 18-120). Pocock 2013 integer extra depends on EF: <55 scores 0; then 55-59, 60-64, 65-69, 70-74, 75-79, >=80. magent does not examine the patient.
- `ef_percent` (number, required): Left-ventricular ejection fraction in percent (1-90). Figure 2: <20 scores 7; 20-24 6; 25-29 5; 30-34 3; 35-39 2; >=40 0. Also selects the age and SBP extra rows. magent does not read an echocardiogram.
- `nyha_class` (integer, required): NYHA class 1-4 as assigned by the caller (Figure 2: I 0, II 2, III 6, IV 8). magent does not assign NYHA class.
- `creatinine_umol_l` (number, optional): Serum creatinine in µmol/L (9-1768), the Figure 2 unit. Provide this or creatinine_mg_dl, not both. Bins: <90 0; 90-109 1; 110-129 2; 130-149 3; 150-169 4; 170-209 5; 210-249 6; >=250 8. magent does not assay creatinine.
- `creatinine_mg_dl` (number, optional): Serum creatinine in mg/dL (0.1-20). Converted as µmol/L = mg/dL × 88.42, then Figure 2 µmol/L bins. Provide this or creatinine_umol_l, not both.
- `diabetes` (boolean, required): Diabetes as assigned by the caller. true scores 3 (Figure 2). magent does not diagnose diabetes.
- `beta_blocker` (boolean, required): Prescribed a beta-blocker as assigned by the caller. true scores 0; false (not prescribed) scores 3. magent does not prescribe therapy.
- `systolic_mm_hg` (number, required): Systolic blood pressure in mm Hg (50-250). Figure 2 extra depends on EF: <110, 110-119, 120-129, 130-139, 140-149, >=150. magent does not measure blood pressure.
- `bmi_kg_m2` (number, required): Caller-supplied body-mass index in kg/m² (10-80). Figure 2: <15 6; 15-19 5; 20-24 3; 25-29 2; >=30 0. magent does not compute BMI from height and weight.
- `hf_duration_gt_18_months` (boolean, required): Heart-failure duration greater than 18 months as assigned by the caller (Table 2 HF duration >18 months). true scores 2. magent does not date the diagnosis.
- `current_smoker` (boolean, required): Current smoker as assigned by the caller. true scores 1. magent does not take a smoking history.
- `copd` (boolean, required): COPD as assigned by the caller. true scores 2. magent does not diagnose COPD.
- `sex` (string, required): Sex (female or male). Male scores 1 (Figure 2).
- `acei_arb` (boolean, required): Prescribed an ACE inhibitor or ARB as assigned by the caller. true scores 0; false (not prescribed) scores 1. magent does not prescribe therapy.

## 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/maggic`
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": [
    {
      "acei_arb": "true",
      "age": "50",
      "beta_blocker": "true",
      "bmi_kg_m2": "30",
      "copd": "false",
      "creatinine_umol_l": "80",
      "current_smoker": "false",
      "diabetes": "false",
      "ef_percent": "55",
      "hf_duration_gt_18_months": "false",
      "nyha_class": "1",
      "sex": "female",
      "systolic_mm_hg": "150"
    },
    {
      "acei_arb": "true",
      "age": "50",
      "beta_blocker": "true",
      "bmi_kg_m2": "30",
      "copd": "false",
      "creatinine_umol_l": "80",
      "current_smoker": "false",
      "diabetes": "false",
      "ef_percent": "55",
      "hf_duration_gt_18_months": "false",
      "nyha_class": "1",
      "sex": "female",
      "systolic_mm_hg": "150"
    }
  ]
}
```

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

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/maggic",
  "items": [
    {
      "components": [
        {
          "value": 55.0,
          "factor": "ef",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "value": 150.0,
          "factor": "systolic_mm_hg",
          "points": 0,
          "present": false
        },
        {
          "value": 30.0,
          "factor": "bmi",
          "points": 0,
          "present": false
        },
        {
          "value": 80.0,
          "factor": "creatinine",
          "points": 0,
          "present": false
        },
        {
          "value": 1,
          "factor": "nyha_class",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "not_prescribed_beta_blocker",
          "points": 0,
          "present": false
        },
        {
          "factor": "hf_duration_gt_18_months",
          "points": 0,
          "present": false
        },
        {
          "factor": "current_smoker",
          "points": 0,
          "present": false
        },
        {
          "factor": "copd",
          "points": 0,
          "present": false
        },
        {
          "factor": "male_sex",
          "points": 0,
          "present": false
        },
        {
          "factor": "not_prescribed_acei_arb",
          "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": "Pocock SJ, Ariti CA, McMurray JJV, Maggioni A, Køber L, Squire IB, Swedberg K, Dobson J, Poppe KK, Whalley GA, Doughty RN",
        "doi": "10.1093/eurheartj/ehs337",
        "id": "pocock-2013",
        "pmid": "23186806",
        "source": "Eur Heart J. 2013;34(19):1404-1413",
        "title": "Predicting survival in heart failure: a risk score based on 39 372 patients from 30 studies"
      },
      "formula": "maggic",
      "formula_expression": "MAGGIC integer score (Pocock 2013 Figure 2): EF <20 7, 20-24 6, 25-29 5, 30-34 3, 35-39 2, >=40 0; age extra by EF (<30 / 30-39 / >=40): <55 0/0/0, 55-59 1/2/3, 60-64 2/4/5, 65-69 4/6/7, 70-74 6/8/9, 75-79 8/10/12, >=80 10/13/15; SBP extra by EF: <110 5/3/2, 110-119 4/2/1, 120-129 3/1/1, 130-139 2/1/0, 140-149 1/0/0, >=150 0/0/0; BMI <15 6, 15-19 5, 20-24 3, 25-29 2, >=30 0; creatinine umol/L <90 0, 90-109 1, 110-129 2, 130-149 3, 150-169 4, 170-209 5, 210-249 6, >=250 8; NYHA I 0, II 2, III 6, IV 8; male 1; current smoker 1; diabetes 3; COPD 2; HF duration >18 months 2; not prescribed beta-blocker 3; not prescribed ACEI/ARB 1; Table 4 1-year and 3-year death probabilities for scores 0-50",
      "systolic_mm_hg": 150.0,
      "age_years": 50,
      "score": 0,
      "sex": "female",
      "bmi_kg_m2": 30.0,
      "creatinine_umol_l": 80.0,
      "diabetes": false,
      "acei_arb": true,
      "beta_blocker": true,
      "copd": false,
      "current_smoker": false,
      "ef_percent": 55.0,
      "hf_duration_gt_18_months": false,
      "nyha_class": 1,
      "death_probability_1y": 0.015,
      "death_probability_3y": 0.039
    },
    {
      "components": [
        {
          "value": 55.0,
          "factor": "ef",
          "points": 0,
          "present": false
        },
        {
          "value": 50,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "value": 150.0,
          "factor": "systolic_mm_hg",
          "points": 0,
          "present": false
        },
        {
          "value": 30.0,
          "factor": "bmi",
          "points": 0,
          "present": false
        },
        {
          "value": 80.0,
          "factor": "creatinine",
          "points": 0,
          "present": false
        },
        {
          "value": 1,
          "factor": "nyha_class",
          "points": 0,
          "present": false
        },
        {
          "factor": "diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "not_prescribed_beta_blocker",
          "points": 0,
          "present": false
        },
        {
          "factor": "hf_duration_gt_18_months",
          "points": 0,
          "present": false
        },
        {
          "factor": "current_smoker",
          "points": 0,
          "present": false
        },
        {
          "factor": "copd",
          "points": 0,
          "present": false
        },
        {
          "factor": "male_sex",
          "points": 0,
          "present": false
        },
        {
          "factor": "not_prescribed_acei_arb",
          "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": "Pocock SJ, Ariti CA, McMurray JJV, Maggioni A, Køber L, Squire IB, Swedberg K, Dobson J, Poppe KK, Whalley GA, Doughty RN",
        "doi": "10.1093/eurheartj/ehs337",
        "id": "pocock-2013",
        "pmid": "23186806",
        "source": "Eur Heart J. 2013;34(19):1404-1413",
        "title": "Predicting survival in heart failure: a risk score based on 39 372 patients from 30 studies"
      },
      "formula": "maggic",
      "formula_expression": "MAGGIC integer score (Pocock 2013 Figure 2): EF <20 7, 20-24 6, 25-29 5, 30-34 3, 35-39 2, >=40 0; age extra by EF (<30 / 30-39 / >=40): <55 0/0/0, 55-59 1/2/3, 60-64 2/4/5, 65-69 4/6/7, 70-74 6/8/9, 75-79 8/10/12, >=80 10/13/15; SBP extra by EF: <110 5/3/2, 110-119 4/2/1, 120-129 3/1/1, 130-139 2/1/0, 140-149 1/0/0, >=150 0/0/0; BMI <15 6, 15-19 5, 20-24 3, 25-29 2, >=30 0; creatinine umol/L <90 0, 90-109 1, 110-129 2, 130-149 3, 150-169 4, 170-209 5, 210-249 6, >=250 8; NYHA I 0, II 2, III 6, IV 8; male 1; current smoker 1; diabetes 3; COPD 2; HF duration >18 months 2; not prescribed beta-blocker 3; not prescribed ACEI/ARB 1; Table 4 1-year and 3-year death probabilities for scores 0-50",
      "systolic_mm_hg": 150.0,
      "age_years": 50,
      "score": 0,
      "sex": "female",
      "bmi_kg_m2": 30.0,
      "creatinine_umol_l": 80.0,
      "diabetes": false,
      "acei_arb": true,
      "beta_blocker": true,
      "copd": false,
      "current_smoker": false,
      "ef_percent": 55.0,
      "hf_duration_gt_18_months": false,
      "nyha_class": 1,
      "death_probability_1y": 0.015,
      "death_probability_3y": 0.039
    }
  ]
}
```

## Response fields

- `formula` (string): maggic
- `formula_expression` (string): Exact expression used
- `age_years` (integer): Age in years used
- `ef_percent` (number): Ejection fraction used, percent
- `nyha_class` (integer): Caller-assigned NYHA class 1-4 used
- `creatinine_umol_l` (number): Serum creatinine used, µmol/L (after conversion if mg/dL was supplied)
- `diabetes` (boolean): Diabetes flag used
- `beta_blocker` (boolean): Prescribed beta-blocker flag used
- `systolic_mm_hg` (number): Systolic BP used, mm Hg
- `bmi_kg_m2` (number): Caller-supplied BMI used, kg/m²
- `hf_duration_gt_18_months` (boolean): HF duration >18 months flag used
- `current_smoker` (boolean): Current-smoker flag used
- `copd` (boolean): COPD flag used
- `sex` (string): female or male used
- `acei_arb` (boolean): Prescribed ACEI/ARB flag used
- `score` (integer): Pocock 2013 MAGGIC integer score
- `death_probability_1y` (number): Table 4 1-year probability of death for scores 0-50. Omitted when score >50.
- `death_probability_3y` (number): Table 4 3-year probability of death for scores 0-50. Omitted when score >50.
- `components` (array): Per-predictor integer points
- `citation` (object): Pocock 2013 Eur Heart J citation
- `disclaimer` (string): Not-a-device notice

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "components": [
    {
      "value": 55.0,
      "factor": "ef",
      "points": 0,
      "present": false
    },
    {
      "value": 50,
      "factor": "age",
      "points": 0,
      "present": false
    },
    {
      "value": 150.0,
      "factor": "systolic_mm_hg",
      "points": 0,
      "present": false
    },
    {
      "value": 30.0,
      "factor": "bmi",
      "points": 0,
      "present": false
    },
    {
      "value": 80.0,
      "factor": "creatinine",
      "points": 0,
      "present": false
    },
    {
      "value": 1,
      "factor": "nyha_class",
      "points": 0,
      "present": false
    },
    {
      "factor": "diabetes",
      "points": 0,
      "present": false
    },
    {
      "factor": "not_prescribed_beta_blocker",
      "points": 0,
      "present": false
    },
    {
      "factor": "hf_duration_gt_18_months",
      "points": 0,
      "present": false
    },
    {
      "factor": "current_smoker",
      "points": 0,
      "present": false
    },
    {
      "factor": "copd",
      "points": 0,
      "present": false
    },
    {
      "factor": "male_sex",
      "points": 0,
      "present": false
    },
    {
      "factor": "not_prescribed_acei_arb",
      "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": "Pocock SJ, Ariti CA, McMurray JJV, Maggioni A, Køber L, Squire IB, Swedberg K, Dobson J, Poppe KK, Whalley GA, Doughty RN",
    "doi": "10.1093/eurheartj/ehs337",
    "id": "pocock-2013",
    "pmid": "23186806",
    "source": "Eur Heart J. 2013;34(19):1404-1413",
    "title": "Predicting survival in heart failure: a risk score based on 39 372 patients from 30 studies"
  },
  "formula": "maggic",
  "formula_expression": "MAGGIC integer score (Pocock 2013 Figure 2): EF <20 7, 20-24 6, 25-29 5, 30-34 3, 35-39 2, >=40 0; age extra by EF (<30 / 30-39 / >=40): <55 0/0/0, 55-59 1/2/3, 60-64 2/4/5, 65-69 4/6/7, 70-74 6/8/9, 75-79 8/10/12, >=80 10/13/15; SBP extra by EF: <110 5/3/2, 110-119 4/2/1, 120-129 3/1/1, 130-139 2/1/0, 140-149 1/0/0, >=150 0/0/0; BMI <15 6, 15-19 5, 20-24 3, 25-29 2, >=30 0; creatinine umol/L <90 0, 90-109 1, 110-129 2, 130-149 3, 150-169 4, 170-209 5, 210-249 6, >=250 8; NYHA I 0, II 2, III 6, IV 8; male 1; current smoker 1; diabetes 3; COPD 2; HF duration >18 months 2; not prescribed beta-blocker 3; not prescribed ACEI/ARB 1; Table 4 1-year and 3-year death probabilities for scores 0-50",
  "systolic_mm_hg": 150.0,
  "age_years": 50,
  "score": 0,
  "sex": "female",
  "bmi_kg_m2": 30.0,
  "creatinine_umol_l": 80.0,
  "diabetes": false,
  "acei_arb": true,
  "beta_blocker": true,
  "copd": false,
  "current_smoker": false,
  "ef_percent": 55.0,
  "hf_duration_gt_18_months": false,
  "nyha_class": 1,
  "death_probability_1y": 0.015,
  "death_probability_3y": 0.039
}
```

## Errors

- HTTP 400 `invalid_maggic`: MAGGIC inputs must be the thirteen Pocock 2013 integer-score variables from that paper (age, EF, NYHA, creatinine, diabetes, beta-blocker, SBP, BMI, diagnosis duration, smoker, COPD, sex, ACEI/ARB). 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

- [ACCF/AHA HF stages](https://magentlab.com/docs/acc-aha-hf) — Apply the 2013 ACCF/AHA heart-failure stages (Yancy) from caller-assigned high-risk, structural heart disease, prior or current HF symptoms, and refractory specialized-care flags. Returns hf_stage A, B, C, D, or not_staged.
- [Framingham HF criteria](https://magentlab.com/docs/framingham-hf) — Apply the McKee 1971 Framingham concurrent major and minor criteria and return definite or not_definite from nine major flags, seven minor flags, and the dual weight-loss flag.

## 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 of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional.
- 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. 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.