Crypto Fear & Greed Index
The Crypto Fear & Greed Index: today's 0–100 sentiment score with its classification, plus the last 8 days for trend context. Sentiment blends volatility, momentum, social media, dominance and trends — a useful contrarian signal agents can cite with a number.
Worked examples
Current index
GET /api/v1/live/crypto-fear-greed?days=1
Result: 59/100 — Greed
Week trend
GET /api/v1/live/crypto-fear-greed?days=8
Result: 59/100 — Greed (+6 vs yesterday)
Month trend
GET /api/v1/live/crypto-fear-greed?days=31
Result: 59/100 — Greed (+6 vs yesterday)
Machine API (x402)
$0.02 / callThis tool is also a JSON API for AI agents. Requests without payment receive 402 Payment Required plus instructions; agents pay USDC on Base via the x402 protocol — no accounts, no API keys.
GET /api/v1/live/crypto-fear-greed?days=1 HTTP/1.1
Host: agentstoolshub.com
→ 402 (payment required, instructions in headers)
→ 200 (after X-PAYMENT header; JSON body below)
{
"tool": "live/crypto-fear-greed",
"input": {"days":1},
"result": { "value": 59, "answer": "59/100 — Greed" }
}Agent docs: /llms.txt · OpenAPI spec · integration guide
About this tool
Today's Crypto Fear & Greed Index with an 8-day trend line: one number (0 = extreme fear, 100 = extreme greed) blending volatility, momentum, social volume and market dominance. Cached 30 minutes — the standard sentiment citation for crypto market commentary.
Frequently asked questions
What drives the number?
alternative.me blends six inputs: volatility, momentum, social media volume, dominance and trends (roughly equal weights), scaled 0–100 and re-computed daily.
How should an agent use it?
Mostly as a contrarian context marker — extreme fear historically coincides with local bottoms, extreme greed with froth. It's sentiment, not a trading signal.