Spec

Code snippets

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

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

$ch = curl_init("https://api.oanor.com/verticalcurve-api/v1/meta");
curl_setopt($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/verticalcurve-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": "US units (ft, %, mph). A = g2−g1; K = L/|A|; elevation = PVC + (g1/100)x + (A/200L)x²; turning point at −g1·L/A from PVC; crest Lmin = A·S²/2158, sag = A·S²/(400+3.5S). For horizontal curves use a horizontal-curve API; for slope conversion a slope API.",
        "service": "verticalcurve-api",
        "endpoints": {
            "GET /v1/meta": "This document.",
            "GET /v1/geometry": "A, K, crest/sag, high/low point and PVC/PVT from the grades and length.",
            "GET /v1/elevation": "Elevation and grade at a distance from the PVC.",
            "GET /v1/min-length": "Minimum crest/sag length for a stopping sight distance."
        },
        "description": "Vertical (parabolic) road-curve geometry: K value & turning point, elevation at a station, and AASHTO minimum length for sight distance."
    },
    "meta": {
        "timestamp": "2026-06-07T08:18:03.128Z",
        "request_id": "7b267a00-1428-4e8e-88f3-033c4a19df86"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}