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Crypto Fear & Greed Index API
x402
Crypto Fear & Greed Index API is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Returns the current Crypto Fear & Greed Index value (0–100), its classification, and historical daily values for the last N days.
Price / call$0.002
Success—
StatusUnknown
How this service works
Crypto Fear & Greed Index (alternative.me): current value 0-100, classification, history of last N days. No params. Use when an agent needs a market-sentiment gauge.
Output
A JSON object containing: the current index value (integer 0–100), a classification string (e.g. 'Fear', 'Greed', 'Extreme Fear', 'Extreme Greed', 'Neutral'), and a history array of daily objects each with a date string, integer value, and classification label for the requested number of past days.
Example use cases
Pre-trade sentiment check for crypto bot
“Before executing this crypto trade, check the current fear and greed index — if we're deep in fear territory I want to reconsider my position size.”
Daily market mood briefing
“Give me today's crypto fear and greed index value and classification so I can include it in my morning market summary.”
30-day sentiment trend analysis
“Pull the fear and greed index for the last 30 days so I can see how market sentiment has shifted over the past month.”
Technical details
Endpoint
GEThttps://x402-data-api.sigrunner.workers.dev/crypto/fear-greed?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, single-call market-sentiment gauge for cryptocurrency markets, especially in agentic trading workflows, daily briefings, or risk-gating logic. It is ideal when you want both the current value and recent history in one response without managing alternative.me directly. At $0.002/call it is cost-effective for high-frequency polling or real-time sentiment monitoring.
Side effects
- Upstream alternative.me API unavailable — returns error or stale data
- Invalid 'days' query parameter type causes schema validation error
- Payment not completed via x402 protocol — request rejected with 402 status
- Rate limits or quota exceeded on the worker side
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"value": 59,
"history": [
{
"date": "2026-10-19",
"value": 59,
"classification": "Greed"
}
],
"classification": "Greed"
}
}Tags
x402
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