Record a measurement

Stores a body-part circumference measurement for the caller.

POST/api/measurements

Authorization

__Secure-better-auth.session_tokenAPI key · cookierequired

Better Auth session. Signing in (Google or email magic link) sets an HttpOnly session cookie that scopes every request to that account. The web app and CLI use this; agents use the OAuth 2.1 flow of the MCP server.

AuthorizationBearer token · headerrequired

Personal API key sent as Authorization: Bearer skcal_…. Create and scope keys in the app under your profile → API keys. Keys default to full access; a scoped key is limited to its granted resource:action permissions and cannot manage other keys.

Request body

requiredapplication/json

The measurement to record.

sitestringrequired

Body site identifier for the new measurement.

valueCmnumberrequired

Circumference to record, in centimetres.

min 1 · max 300

Responses

200

The measurement was stored.

okbooleanrequired

Always true.

400

The request body or parameters failed validation.

errorstringrequired

Human-readable failure reason.

detailstring

Optional extra context, present on upstream failures.

Try it

Server

Base URLCustom base URLOverrides the selected server when set.

Authorization

API keyRemember on this deviceInclude my values in samples

Bodyapplication/json

sitestring*Body site identifier for the new measurement.valueCmnumber*Circumference to record, in centimetres.

Request

curl -X POST 'https://app.skcal.fit/api/measurements' \
  -H 'Cookie: __Secure-better-auth.session_token=YOUR_API_KEY' \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "site": "waist",
  "valueCm": 81.5
}'

const response = await fetch("https://app.skcal.fit/api/measurements", {
  method: "POST",
  headers: {
    "Cookie": "__Secure-better-auth.session_token=YOUR_API_KEY",
    "Accept": "application/json",
    "Content-Type": "application/json"
  },
  body: "{\n  \"site\": \"waist\",\n  \"valueCm\": 81.5\n}"
});

import requests

response = requests.post(
    "https://app.skcal.fit/api/measurements",
    headers={
        "Cookie": "__Secure-better-auth.session_token=YOUR_API_KEY",
        "Accept": "application/json",
        "Content-Type": "application/json"
    },
    data="{\n  \"site\": \"waist\",\n  \"valueCm\": 81.5\n}",
)

Response

{
  "ok": true
}

{
  "error": "weightKg must be 9-320 kg",
  "detail": "upstream model returned 500"
}