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magent BRI Calculator
x402
magent BRI Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Computes Body Roundness Index (BRI) from height and waist circumference using the Thomas 2013 ellipse formula
Price / call$0.005
Success—
StatusUnknown
How this service works
Body roundness index from height and waist (Thomas 2013). Models the body as an ellipse: e = sqrt(1 - (waist/(pi*height))^2), BRI = 364.2 - 365.5*e. Deterministic published formula with citation. Not a medical device, VAT measurement, or body-fat diagnosis; magent does not measure the patient.
Output
Returns a numeric Body Roundness Index (BRI) value computed from the Thomas 2013 formula: BRI = 364.2 - 365.5 * sqrt(1 - (waist/(pi*height))^2), where both measurements are normalized to the same unit. The response is a deterministic, reproducible score reflecting how 'round' the body shape is relative to a circle.
Example use cases
Population health screening workflow
“I'm running a health screening and need to compute BRI scores for patients. Can you calculate the BRI for a patient who is 68 inches tall with an 85 cm waist?”
Fitness tracker body shape metric
“My user logged their measurements: height 180 cm and waist 78 cm — can you compute their Body Roundness Index so I can show it on their dashboard?”
Clinical research anthropometric analysis
“For a study participant who is 162 cm tall and has a 95 cm waist circumference, what is their BRI score according to the Thomas 2013 ellipse model?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/briWhen to prefer
Use this endpoint when you need a fast, reproducible, citation-backed BRI calculation (Thomas 2013) without building the formula yourself. Prefer it over body-fat or VAT estimation endpoints — this is purely an anthropometric index, not a diagnostic or body composition tool. Best suited for health apps, clinical research pipelines, and population screening workflows that need a standard BRI score from height and waist inputs.
Side effects
- Missing waist_cm parameter returns a validation error
- waist_cm outside plausible range (40–200 cm) may be rejected or produce out-of-range BRI
- Neither height_cm nor height_in provided results in a missing-parameter error
- Non-numeric inputs cause schema validation failure
- Payment failure (402) if x402 USDC payment header is not included
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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