Spec

Code snippets

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

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

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

Example response

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

{
    "data": {
        "notes": "f-numbers, seconds, ISO, EV. EV = log₂(N²/t); EV100 = EV − log₂(ISO/100); exposure ∝ t·ISO/N². Conditions: snow_sand, sunny, slight_overcast, overcast, heavy_overcast, open_shade. For depth of field / hyperfocal use a photography (optics) API.",
        "service": "exposure-api",
        "endpoints": {
            "GET /v1/meta": "This document.",
            "GET /v1/sunny16": "Sunny-16 shutter for a lighting condition, ISO and aperture.",
            "GET /v1/equivalent": "New shutter for equal exposure when aperture/ISO change.",
            "GET /v1/exposure-value": "EV and EV100 from aperture, shutter and ISO."
        },
        "description": "Photographic exposure maths: exposure value (EV) from aperture/shutter/ISO, equivalent-exposure reciprocity, and Sunny-16 settings."
    },
    "meta": {
        "timestamp": "2026-06-07T08:18:07.095Z",
        "request_id": "6b5cbe9f-6cd0-4d3a-b0e9-48d9917612cb"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}