A single physical constant by name or slug

Code-Snippets

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

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

$ch = curl_init("https://api.oanor.com/constants-api/v1/constant");
curl_setopt($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/constants-api/v1/constant",
    headers={"x-oanor-key": "oanor_test_..."}
)

Beispiel-Response

Echte Antwort dieses Endpoints, erfasst beim letzten Health-Check.

{
    "data": {
        "name": "speed of light in vacuum",
        "slug": "speed-of-light-in-vacuum",
        "unit": "m s^-1",
        "exact": true,
        "value": 299792458,
        "value_str": "299 792 458",
        "uncertainty": 0
    },
    "meta": {
        "timestamp": "2026-05-31T05:48:03.942Z",
        "request_id": "12bbb0d6-2b1d-48fb-b4b8-659b25dd663a"
    },
    "status": "ok",
    "message": "Constant retrieved",
    "success": true
}