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GET /v1/composite

Composite transmission loss

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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/soundproof-api

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Code snippets

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

Example response

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

{
    "data": {
        "note": "Composite TL = −10·log10(Σ(Ai·τi)/ΣAi), τ = 10^(−TL/10). The weakest element dominates — a small gap or window can wreck an otherwise good wall.",
        "inputs": {
            "elements": [
                {
                    "area": 9,
                    "tl_db": 45,
                    "transmission_coefficient": 3.1622776601683795e-5
                },
                {
                    "area": 1,
                    "tl_db": 25,
                    "transmission_coefficient": 0.0031622776601683794
                }
            ]
        },
        "total_area_m2": 10,
        "composite_transmission_loss_db": 34.6257
    },
    "meta": {
        "timestamp": "2026-06-05T11:30:29.333Z",
        "request_id": "c340c564-1777-4b36-abca-6e46cc02aad1"
    },
    "status": "ok",
    "message": "Composite TL",
    "success": true
}