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greeneris-data Crypto Fear & Greed Index
x402
greeneris-data Crypto Fear & Greed Index is a paid API for AI agents from data.greeneris.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Returns the current Crypto Fear & Greed Index value with classification and 7-day delta, optionally for up to 90 daily data points
Price / call$0.001
Success—
StatusUnknown
How this service works
**European business verification for AI agents** - check that a company exists (official French SIREN registry), screen insolvency records (BODACC), validate EU VAT numbers before invoicing (VIES), verify SIRET/IBAN/LEI, addresses and email deliverability, find EU public tenders. Plus 70+ supporting pay-per-call data endpoints (FX, macro, energy, weather, crypto) at commodity prices. **No account, no API key**: every paid endpoint answers HTTP 402 with a machine-readable quote; pay in USDC on Base via the x402 protocol and retry. AI agents can also use the MCP server (`/mcp`, streamable HTTP, x402-paid tools) or read `/llms.txt` for the full plain-text catalog. Official data sources (INSEE, European Commission, DILA, GLEIF, ECB); no personal data served; buyers are never charged for empty or failed answers.
Output
Returns a JSON object with the Fear & Greed index value (0-100), classification label (e.g. 'Fear', 'Greed', 'Extreme Fear'), 7-day delta, Unix timestamp, and source attribution from alternative.me. When multiple days are requested, returns an array of daily data points.
Example use cases
Example prompt
“What's the current crypto fear and greed index? Show me today's value and the last 7 days of data so I can see how sentiment has trended.”
Technical details
Endpoint
GEThttps://data.greeneris.io/v1/crypto/fngWhen to prefer
Use this endpoint when you need a pay-per-call, no-account sentiment gauge for the crypto market based on the widely-recognized alternative.me Fear & Greed Index. Prefer it over self-hosted alternatives when operating in an x402-compatible agent environment and you want a single commodity-priced call without subscription overhead.
Side effects
- HTTP 402 returned with machine-readable payment quote if USDC payment via x402 has not been made
- Invalid days parameter (outside 1-90 range) returns validation error
- Upstream alternative.me data unavailable causes service failure
- No charge occurs for empty or failed responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"value": 28,
"source": "Crypto Fear & Greed Index by alternative.me",
"delta_7d": -5,
"timestamp": 1783900800,
"classification": "Fear"
}
}Tags
x402
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