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Crypto Fear & Greed Index
x402
Crypto Fear & Greed Index is a paid API for AI agents from api.chainmarket-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).
Returns the current and historical Crypto Fear & Greed Index values with momentum indicators and short-term change metrics
Price / call$0.002
Success—
StatusUnknown
How this service works
Crypto Fear & Greed Index (0-100) from alternative.me: today's value and label, change vs yesterday and vs 7 days ago, 7-day average, and a sentiment momentum label (rising, falling, flat). Daily; the source updates once a day. Attribution to alternative.me is requested by the source.
Output
Returns a JSON object with: current index value (0–100) and sentiment label (e.g. 'Neutral', 'Greed', 'Fear'), 7-day average score, 1-day and 7-day point changes, a momentum indicator ('rising' or 'falling'), an array of daily historical entries (date, value, label), and the timestamp of when data was fetched. Source is Alternative.me.
Example use cases
Daily crypto sentiment briefing
“Give me a morning update on crypto market sentiment — what's the fear and greed index sitting at today, and has momentum been rising or falling this week?”
Timing a crypto trade entry
“I'm thinking of buying some ETH — can you check the fear and greed index and tell me if we're in extreme fear territory right now? Show me the last 10 days of data so I can see the trend.”
Automated sentiment monitoring alert
“Pull the crypto fear and greed index for the last 30 days and let me know if the current reading has dropped more than 20 points in the past week — I want to know if there's been a big sentiment shift.”
Technical details
Endpoint
GEThttps://api.chainmarket-api.workers.dev/api/crypto/fear-greed-index?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, no-signup sentiment gauge for the broader crypto market with built-in trend analysis (7-day average, momentum, delta). It is ideal for agents that need a single structured response combining current state and recent history without querying multiple endpoints. Prefer over raw blockchain data sources when the question is about collective market mood rather than specific token prices or on-chain metrics.
Side effects
- Invalid 'days' parameter (outside 8–30 range) may return an error or default behavior
- Upstream Alternative.me API downtime could cause stale or missing data
- Payment failure over x402 protocol results in no charge and no data returned
- Requesting fewer than 8 days may produce unreliable 7-day change figures per schema notes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"avg7d": 57.57,
"source": "https://api.alternative.me/fng/",
"current": {
"date": "2026-10-23",
"label": "Neutral",
"value": 50
},
"history": [
{
"date": "2026-10-23",
"label": "Neutral",
"value": 50
},
{
"date": "2026-10-22",
"label": "Greed",
"value": 68
}
],
"change1d": -18,
"change7d": -13,
"momentum": "falling",
"checkedAt": "2026-10-23T09:35:56.333Z"
}
}Tags
x402
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