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Crypto Fear & Greed Index API
x402
Crypto Fear & Greed Index API is a paid API for AI agents from asistent-crypto.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns the current and previous Crypto Fear & Greed Index values with sentiment classifications plus recent historical readings for contrarian market analysis.
Price / call$0.01
Success—
StatusUnknown
How this service works
Crypto Fear & Greed Index: current and previous value with classification, plus recent history. A contrarian input — extreme fear has historically marked accumulation zones and extreme greed distribution zones — but it is a filter, never a trigger on its own. Pair it with funding to separate real capitulation from a crowded short.
Output
Returns the current Crypto Fear & Greed Index numeric value (0–100) with its sentiment classification (e.g. Extreme Fear, Fear, Neutral, Greed, Extreme Greed), the previous period's value and classification for comparison, and a recent historical series of index readings to identify trends.
Example use cases
Pre-trade sentiment check
“Before I put more money into Bitcoin, tell me what the fear and greed index is right now and whether we're in a historically good accumulation zone or a risky distribution area.”
Daily crypto market briefing
“Give me today's crypto sentiment summary — what's the fear and greed index reading, how does it compare to yesterday, and has it been trending toward more fear or more greed this week?”
Contrarian entry signal filter
“I'm looking at a potential long entry on ETH — pull the fear and greed index and tell me if we're close to extreme fear territory that might confirm a contrarian buy setup.”
Technical details
Endpoint
POSThttps://asistent-crypto.vercel.app/api/x402/data/fear-greedWhen to prefer
Choose this endpoint when you need a fast, pay-per-call sentiment gauge with no API key or account setup. It is ideal for contrarian analysis workflows — particularly when combined with funding rate data to distinguish genuine capitulation from crowded short scenarios. Prefer this over rolling your own sentiment aggregator when you need a well-known standardized index value with historical context in a single call.
Side effects
- Upstream data provider outage causing stale or unavailable index data
- Payment failure or insufficient USDC balance preventing API access
- Network timeout on the Vercel edge function
- Index value temporarily unavailable during data refresh windows
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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