Body-fat % via the U.S. Navy circumference method (height/neck/waist, plus hip for women), the ACE category, and fat/lean mass if a body weight is given.
Free tier eligible — 500 calls/month with a free key from /pricing; x402 pay-per-call above quota.
| Parameter | Type | Required | Description |
|---|---|---|---|
sex | string | optional | 'male' or 'female' (default male) |
height_cm | number | required | Height in centimetres |
neck_cm | number | required | Neck circumference in centimetres |
waist_cm | number | required | Waist circumference in centimetres |
hip_cm | number | optional | Hip circumference in cm (required for the female estimate) |
weight_kg | number | optional | Body weight in kg (optional; enables fat/lean mass) |
curl -s https://wingmanprotocol.com/mcp \
-H 'Content-Type: application/json' \
-H 'Accept: application/json, text/event-stream' \
-d '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "body_fat", "arguments": {"height_cm": 70, "neck_cm": 100, "waist_cm": 100}}}'curl -s https://wingmanprotocol.com/tools/body_fat \
-H 'Content-Type: application/json' \
-d '{"height_cm": 70, "neck_cm": 100, "waist_cm": 100}'Edit the JSON and run it — this POSTs to https://wingmanprotocol.com/tools/body_fat from your browser.
X-Payment header, or get a free key at /pricing (500 calls/month, no card, no crypto).