Spec

Code snippets

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

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

$ch = curl_init("https://api.oanor.com/concrete-api/v1/meta");
curl_setopt($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/concrete-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": "Volume in m³, mass in kg, water in litres. Densities: cement 1440, sand 1600, aggregate 1450 kg/m³; cement bag 50 kg. Nominal volume-batching estimate, not a designed (BS/ACI) mix.",
        "service": "concrete-api",
        "formulae": {
            "water": "water = (w/c)·cement_mass",
            "cement": "cement_vol = dry·c/Σ,  mass = vol×1440,  bags = mass/50",
            "dry_volume": "dry = wet × 1.54"
        },
        "endpoints": {
            "GET /v1/mix": "Cement (bags), sand, aggregate and water for a volume of concrete at a nominal mix ratio.",
            "GET /v1/meta": "This document.",
            "GET /v1/quantity": "Concrete volume from a slab, footing or column, with a wastage allowance.",
            "GET /v1/watercement": "Water-cement ratio: solve water, cement or ratio from the other two."
        },
        "description": "Concrete mix-design calculator: material breakdown from a mix ratio, concrete volume from a shape, and water-cement ratio solving."
    },
    "meta": {
        "timestamp": "2026-06-04T18:38:25.661Z",
        "request_id": "1a1a8696-cb8c-40c3-997d-44d73fb609e4"
    },
    "status": "ok",
    "message": "Meta",
    "success": true
}