Totals & ECO volumes

Code snippets

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

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

$ch = curl_init("https://api.oanor.com/chessopenings-api/v1/meta");
curl_setopt($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/chessopenings-api/v1/meta",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "note": "The Encyclopaedia of Chess Openings (ECO). Search by name/eco/volume, list by ECO code, identify an opening from a move sequence (/v1/identify?moves=1. e4 c5), or get a random opening.",
        "total": 3161,
        "fields": [
            "eco",
            "name",
            "family",
            "variation",
            "pgn",
            "moves",
            "ply",
            "volume"
        ],
        "source": "lichess-org/chess-openings (ECO)",
        "volumes": {
            "A": "Flank openings",
            "B": "Semi-Open Games (except the French)",
            "C": "Open Games & the French",
            "D": "Closed & Semi-Closed Games",
            "E": "Indian Defences"
        },
        "by_volume": {
            "A": 672,
            "B": 674,
            "C": 1089,
            "D": 458,
            "E": 268
        },
        "eco_codes": 464
    },
    "meta": {
        "timestamp": "2026-05-31T09:34:55.117Z",
        "request_id": "7cf52043-eb6d-4e49-8e99-457e23574854"
    },
    "status": "ok",
    "message": "Meta retrieved",
    "success": true
}