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GET /v1/froude

Froude number

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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/reynolds-api

It works. Grab an API key and use it in your project.

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Code snippets

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

Example response

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

{
    "data": {
        "note": "Fr = v/√(g·L). Subcritical < 1 (tranquil), critical = 1, supercritical > 1 (rapid/shooting flow).",
        "inputs": {
            "length": 0.5,
            "gravity": 9.81,
            "velocity": 3
        },
        "flow_regime": "supercritical",
        "froude_number": 1.354571,
        "critical_velocity_m_s": 2.214723
    },
    "meta": {
        "timestamp": "2026-06-04T18:38:24.539Z",
        "request_id": "ce88c9df-abd0-4960-bdd3-27284e990693"
    },
    "status": "ok",
    "message": "Froude number",
    "success": true
}