Spec

Code snippets

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

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

$ch = curl_init("https://api.oanor.com/rcfilter-api/v1/meta");
curl_setopt($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/rcfilter-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": "R in ohms, C in farads, L in henries, frequency in hertz. First-order single-pole filters; for full RLC impedance use an impedance API and for stored capacitor energy a capacitor API.",
        "service": "rcfilter-api",
        "endpoints": {
            "GET /v1/meta": "This document.",
            "GET /v1/lowpass": "Low-pass cutoff, time constant, and (optional) gain/phase at a frequency.",
            "GET /v1/highpass": "High-pass cutoff, time constant, and (optional) gain/phase at a frequency.",
            "GET /v1/component": "Solve the missing one of fc, R, C (RC: fc = 1/(2πRC))."
        },
        "description": "First-order RC/RL passive filter design: cutoff frequency, time constant, magnitude and phase response, and component solving."
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:30.861Z",
        "request_id": "9c49a2bd-a1f6-4bd4-93f9-7768c6e0c822"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}