WEDGE

Cockcroft–Gault CrCl

Deterministic creatinine clearance from age, sex, total body weight, and creatinine. Not a dosing recommendation.

WEDGE $0.005 USDC GET /api/calc/crcl_cockcroft_gault

When to use

Cockcroft-Gault creatinine clearance from age, sex, total body weight, and creatinine. Use when a label still doses on CrCl rather than CKD-EPI eGFR. Deterministic published formula with citation; not a dosing recommendation.

Try

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

/api/calc/crcl_cockcroft_gault?age=65&sex=female&weight_kg=70&creatinine_mg_dl=1.1

Full URL: https://api.magentlab.com/api/calc/crcl_cockcroft_gault?age=65&sex=female&weight_kg=70&creatinine_mg_dl=1.1

Request

GET /api/calc/crcl_cockcroft_gault · x402 V2 · USDC on Base · $0.005 USDC

x402 V2 curl

Expect HTTP 402 and a PAYMENT-REQUIRED header until you retry with PAYMENT-SIGNATURE.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/crcl_cockcroft_gault?age=65&sex=female&weight_kg=70&creatinine_mg_dl=1.1"

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"
      }
    }
  }
}

Query parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120).
`sex`	string	required · female, male	female applies the published 0.85 factor; male does not.
`weight_kg`	number	optional	Total body weight in kilograms. Provide weight_kg or weight_lb.
`weight_lb`	number	optional	Total body weight in pounds. Converted as kg = lb * 0.45359237.
`creatinine_mg_dl`	number	optional	Serum creatinine in mg/dL. Provide this or creatinine_umol_l.
`creatinine_umol_l`	number	optional	Serum creatinine in µmol/L. Converted as mg/dL = µmol/L / 88.42.

Success fields

Field	Type	Description
`formula`	string	cockcroft_gault
`formula_expression`	string	Exact expression used
`age_years`	integer	Age used in the equation
`sex`	string	female or male
`weight_kg`	number	Total body weight in kg
`creatinine_mg_dl`	number	Normalized creatinine
`crcl_ml_min`	number	Creatinine clearance in mL/min, 1 decimal place
`units`	string	mL/min
`weight_basis`	string	Always total_body_weight. Ideal/adjusted body weight is not applied.
`citation`	object	Nephron 1976 citation
`disclaimer`	string	Not-a-device notice

Example

Frozen fixture. Not a live lookup.

{
  "units": "mL/min",
  "creatinine_mg_dl": 1.1,
  "sex": "female",
  "weight_kg": 70.0,
  "disclaimer": "Not a medical device. Deterministic published-formula or coded-ontology output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Cockcroft DW, Gault MH",
    "doi": "10.1159/000180580",
    "id": "cockcroft-1976",
    "source": "Nephron. 1976;16(1):31-41",
    "title": "Prediction of creatinine clearance from serum creatinine"
  },
  "formula": "cockcroft_gault",
  "formula_expression": "CrCl_mL_min = ((140 - age) * weight_kg * (0.85 if female else 1)) / (72 * Scr_mg_dL)",
  "age_years": 65,
  "crcl_ml_min": 56.3,
  "weight_basis": "total_body_weight"
}

Payment

Unpaid 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.

Errors

HTTP	Code	When
400	`invalid_age`	age must be an integer from 18 to 120
400	`invalid_sex`	sex must be female or male
400	`invalid_weight`	weight_kg (1-500) or weight_lb (2-1100) is required
400	`invalid_creatinine`	creatinine_mg_dl (0.1-20) or creatinine_umol_l (9-1768) is required
402	`payment_required`	Missing or invalid PAYMENT-SIGNATURE; decode the PAYMENT-REQUIRED header
409	`payment_in_progress`	The same authorization nonce is already being settled; retry shortly
429	`rate_limited`	Too many requests from this client
503	`settlement_uncertain`	Settlement is unconfirmed; retry with the same PAYMENT-SIGNATURE
503	`facilitator_unavailable`	Payment facilitator unavailable
503	`facilitator_misconfigured`	Payment facilitator is not configured
503	`facilitator_unauthorized`	Payment facilitator rejected credentials
503	`ledger_unavailable`	Payment ledger unavailable
503	`payment_unavailable`	Payment processing unavailable

Guarantees

Settlement finishes before the tool executes. Uncertain settlement fails closed (HTTP 503).
Lookups run on our nodes — no third-party data API wrappers.
Localhost, IP literals, and metadata hostnames are rejected.
Execution is timeout-bounded and concurrency-capped.