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GET /v1/history

Daily VIX/VIX3M contango-ratio series with backwardation days flagged

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/vixterm-api

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Code snippets

curl "https://api.oanor.com/vixterm-api/v1/history" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/vixterm-api/v1/history", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/vixterm-api/v1/history");
curl_setopt($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/vixterm-api/v1/history",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "days": 251,
        "note": "Daily time series of the VIX / VIX3M contango ratio. backwardation_days counts days the ratio exceeded 1 (the curve inverted — stress). Read fresh per call, lightly cached.",
        "source": "Yahoo Finance (^VIX, ^VIX3M)",
        "current": {
            "vix": 19.44,
            "date": "2026-06-11",
            "vix3m": 21.42,
            "contango_ratio": 0.9076
        },
        "history": [
            {
                "vix": 18.02,
                "date": "2025-06-12",
                "vix3m": 20.65,
                "backwardation": false,
                "contango_ratio": 0.8726
            },
            {
                "vix": 20.82,
                "date": "2025-06-13",
                "vix3m": 22.62,
                "backwardation": false,
                "contango_ratio": 0.9204
            },
            {
                "vix": 19.11,
                "date": "2025-06-16",
                "vix3m": 21.23,
                "backwardation": false,
                "contango_ratio": 0.9001
            },
            {
                "vix": 21.6,
                "date": "2025-06-17",
                "vix3m": 22.91,
                "backwardation": false,
                "contango_ratio": 0.9428
            },
            {
                "vix": 20.14,
                "date": "2025-06-18",
                "vix3m": 21.97,
                "backwardation": false,
                "contango_ratio": 0.9167
            },
            {
                "vix": 20.62,
                "date": "2025-06-20",
                "vix3m": 22.48,
                "backwardation": false,
                "contango_ratio": 0.9173
            },
            {
                "vix": 19.83,
                "date": "2025-06-23",
                "vix3m": 21.82,
                "backwardation": false,
                "contango_ratio": 0.9088
            },
            {
                "vix": 17.48,
                "date": "2025-06-24",
                "vix3m": 20.05,
                "backwardation": false,
                "contango_ratio": 0.8718
            },
            {
                "vix": 16.76,
                "date": "2025-06-25",
                "vix3m": 19.67,
                "backwardation": false,
                "contango_ratio": 0.8521
            },
            {
                "vix": 16.59,
                "date": "2025-06-26",
                "vix3m": 19.45,
                "backwardation": false,
                "contango_ratio": 0.853
            },
            {
                "vix": 16.32,
                "date": "2025-06-27",
                "vix3m": 19.45,
                "backwardation": false,
                "contango_ratio": 0.8391
            },
            {
                "vix": 16.73,
                "date": "2025-06-30",
                "vix3m": 19.44,
                "backwardation": false,
                "contango_ratio": 0.8606
            },
            {
           
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