Crypto Fear & Greed Index API

Base URL

https://api.alternative.me/fng

Authentication

No key or registration. Attribution to alternative.me is requested when you display the index.

Rate limit

No published limit. The index changes once a day, so caching costs nothing.

Pricing

Free.

CORS

Enabled — callable directly from browser JavaScript

Official docs

Read the docs

Every request below was executed against the live API on 21 Aug 2026, and the response shown is the real body it returned — not an illustration.

curl 'https://api.alternative.me/fng/?limit=2'

const res = await fetch("https://api.alternative.me/fng/?limit=2");
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

import requests

res = requests.get("https://api.alternative.me/fng/?limit=2", timeout=20)
res.raise_for_status()
print(res.json())

{
  "name": "Fear and Greed Index",
  "data": [
    {
      "value": "72",
      "value_classification": "Greed",
      "timestamp": "1787270400",
      "time_until_update": "58448"
    },
    {
      "value": "62",
      "value_classification": "Greed",
      "timestamp": "1787184000"
    }
  ],
  "metadata": {
    "error": null
  }
}

namestring

`Fear and Greed Index`.

data[].valuestring

The score from 0 to 100, as a string. 0 is extreme fear, 100 extreme greed.

data[].value_classificationstring

Text band — Extreme Fear, Fear, Neutral, Greed or Extreme Greed.

data[].timestampstring

Unix seconds for the day the reading belongs to, quoted as a string.

data[].time_until_updatestring

Seconds until the next update. Present only on the newest entry, which makes it a reliable current-reading marker.

metadata.errorstring|null

Null on success; carries an error message otherwise.

• Display a crypto sentiment gauge on a dashboard
• Chart sentiment against price over a historical period
• Log the daily reading into your own time series
• Identify the current reading by the presence of `time_until_update`

If Crypto Fear & Greed Index does not fit, these finance & crypto apis cover similar ground. Every one was called before publishing, and each links to its own reference page with a working curl command and the response it returned.