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GET /v1/sound

Acoustic Doppler shift

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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/doppler-api

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Code snippets

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

Example response

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

{
    "data": {
        "formula": "f' = f·(v + vo) / (v − vs); positive velocities mean approaching.",
        "shifted": "higher (approaching)",
        "sound_speed_m_s": 343.2146,
        "frequency_shift_hz": 95.780969,
        "sound_speed_source": "air at 20°C",
        "source_velocity_m_s": 30,
        "emitted_frequency_hz": 1000,
        "observed_frequency_hz": 1095.780969,
        "observer_velocity_m_s": 0
    },
    "meta": {
        "timestamp": "2026-06-04T10:18:56.543Z",
        "request_id": "b5bdef9f-03fb-4526-9e55-e52a19ad69af"
    },
    "status": "ok",
    "message": "Acoustic Doppler shift",
    "success": true
}