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GET /v1/flux

Brightness ratio

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/starmagnitude-api

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Code snippets

curl "https://api.oanor.com/starmagnitude-api/v1/flux" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/starmagnitude-api/v1/flux", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/starmagnitude-api/v1/flux");
curl_setopt($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/starmagnitude-api/v1/flux",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "note": "Pogson: a difference of 5 magnitudes is exactly a 100× brightness ratio. F₁/F₂ = 10^(0.4·(m₂−m₁)).",
        "inputs": {
            "source": "two_magnitudes",
            "magnitude_difference": 5
        },
        "brightness_ratio": 100,
        "magnitude_difference": 5
    },
    "meta": {
        "timestamp": "2026-06-04T18:38:02.891Z",
        "request_id": "c89b0dff-7b86-4b08-9387-a69018f8c3de"
    },
    "status": "ok",
    "message": "Brightness ratio",
    "success": true
}