Spec

Code snippets

curl "https://api.oanor.com/sizes-api/v1/meta" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/sizes-api/v1/meta", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/sizes-api/v1/meta");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/sizes-api/v1/meta",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Guidance only — manufacturers' sizing varies; check the brand's own chart for a critical fit.",
        "service": "sizes",
        "systems": {
            "hat": [
                "cm",
                "in",
                "us",
                "uk"
            ],
            "ring": [
                "us",
                "iso",
                "eu",
                "circumference",
                "diameter",
                "uk"
            ],
            "shoe": [
                "eu",
                "uk",
                "us-men",
                "us-women",
                "mondopoint",
                "cm"
            ]
        },
        "endpoints": {
            "/v1/hat": "Convert a hat size between head circumference (cm/in), EU, US and UK.",
            "/v1/ring": "Convert a ring size between US numeric, ISO/EU circumference, diameter and UK letter.",
            "/v1/shoe": "Convert a shoe size between EU, UK, US (men/women), Mondopoint and foot length (cm)."
        },
        "description": "International size conversion for shoes, rings and hats, derived from standard ISO/Mondopoint/barleycorn relationships."
    },
    "meta": {
        "timestamp": "2026-06-03T17:42:01.536Z",
        "request_id": "8e8f7d82-005e-40e4-a327-822cc91e23a4"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}