Altcoin season index (0-100) with season label and counts

Code snippets

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

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

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

Example response

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

{
    "data": {
        "note": "The altcoin season index is the share of the top altcoins that outperformed Bitcoin over window_days, on a 0-100 scale. >=75 = altcoin season (rotate into alts); <=25 = bitcoin season (flight to BTC). Default window is the classic 90 days. Not financial advice.",
        "season": "leaning bitcoin",
        "source": "Binance",
        "alts_total": 50,
        "window_days": 90,
        "btc_return_pct": -10.13,
        "altcoin_season_index": 28,
        "alts_outperforming_btc": 14,
        "alts_underperforming_btc": 36
    },
    "meta": {
        "timestamp": "2026-06-12T10:35:21.664Z",
        "request_id": "5bbe792f-db0f-405f-8789-a3a2f02d12bd"
    },
    "status": "ok",
    "message": "Index retrieved successfully",
    "success": true
}