Crypto fear and greed index API

From $0.01 per successful call · failed calls are never charged · no account needed · Markdown version: /guides/crypto-fear-and-greed-index-api.md

The Crypto Fear & Greed Index (0 = extreme fear, 100 = extreme greed) from alternative.me: today's value and label, the change against 1, 7 and 30 days ago, the low, high and average over the window, and the daily history (up to 90 days, default 30). Updated once a day. Use as a market-sentiment input for a trading agent, a dashboard or a daily brief; for live prices use price_token.

Fear and greed index, crypto: today's value and history $0.01

Inputs: days: Days of history, 1-90 (default 30).

Free first (25 successful calls per caller, no key):

curl "https://tools.funwords.eu/crypto/fear-greed?days=30&trial=1"

With a card key from /credits, in a header or, when your client can only fetch a URL, in the URL:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/crypto/fear-greed?days=30"
curl "https://tools.funwords.eu/crypto/fear-greed?days=30&api_key=adt_…"

Without a key the same URL answers 402 Payment Required with x402 and MPP terms, so a wallet client pays USDC per call and retries. Over MCP (https://tools.funwords.eu/mcp) this tool is crypto_fear_greed.

Example result

{
  "value": 51,
  "classification": "Neutral",
  "date": "2026-10-24",
  "change": {
    "vs1d": 1,
    "vs7d": -17,
    "vs30d": 9
  },
  "range": {
    "low": 38,
    "high": 72,
    "average": 54.2,
    "days": 30
  },
  "nextUpdateSeconds": 62493,
  "history": [
    {
      "date": "2026-10-24",
      "value": 51,
      "classification": "Neutral"
    }
  ],
  "source": "alternative.me",
  "attribution": "Crypto Fear & Greed Index by alternative.me (https://alternative.me/crypto/fear-and-greed-index/)"
}

Tool page, inputs and limits

Crypto market overview: sentiment, prices, funding and signals $0.03

Market sentiment, prices and signals in one call: the Fear & Greed index with its 7-day change (alternative.me, attributed), the 10 most traded Hyperliquid perpetuals with price, 24-hour change, funding and open interest, technical readings (RSI, MACD, moving averages) for up to three coins, and Bitcoin fee rates. Cheaper than the five tools bought one by one. Use for a daily market brief, a trading agent's context or a dashboard.

Inputs: coins: Up to 3 coins for technical readings, comma separated (default BTC,ETH,SOL).

Free first (25 successful calls per caller, no key):

curl "https://tools.funwords.eu/pack/crypto-market?coins=BTC%2CETH%2CSOL&trial=1"

With a card key from /credits, in a header or, when your client can only fetch a URL, in the URL:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/pack/crypto-market?coins=BTC%2CETH%2CSOL"
curl "https://tools.funwords.eu/pack/crypto-market?coins=BTC%2CETH%2CSOL&api_key=adt_…"

Example result

{
  "pack": "crypto-market",
  "coins": [
    "BTC",
    "ETH",
    "SOL"
  ],
  "sentiment": {
    "value": 51,
    "classification": "Neutral",
    "change7d": -4,
    "attribution": "Crypto Fear & Greed Index by alternative.me"
  },
  "topMarkets": [
    {
      "coin": "BTC",
      "markPx": 81870,
      "change24hPct": 0.66,
      "fundingAprPct": 10.95,
      "openInterestUsd": 3401847000,
      "dayVolumeUsd": 2604051652
    }
  ],
  "signals": [
    {
      "coin": "BTC",
      "close": 81870,
      "rsi14": 48.2,
      "readings": [
        "RSI neutral (30-70)",
        "price above SMA 200"
      ]
    }
  ],
  "bitcoinFees": {
    "nextBlock": 3,
    "hour": 2,
    "unit": "sat/vB"
  },
  "failed": {}
}

Tool page, inputs and limits

Questions

How do I pay?

Each successful call costs the tool's price; failed calls are not charged. The first 25 calls are free. Then pay with card credits from $1 (the key goes in an Authorization header or as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.