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Polyform Crypto Fear & Greed Index
x402
Polyform Crypto Fear & Greed Index is a paid API for AI agents from api.polyform.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Returns the current Crypto Fear & Greed Index value (0–100) with classification label, sourced from alternative.me
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.
Output
Returns a JSON object with: the current numeric score (0–100), a classification string (e.g. 'Fear', 'Extreme Greed'), a scale description, the data source (alternative.me), and the timestamp of the reading.
Example use cases
Pre-trade sentiment check
“Before I make any crypto trades today, what's the fear and greed index sitting at, and is the market leaning fearful or greedy?”
DCA strategy trigger
“I only want to dollar-cost average into Bitcoin when the market is in extreme fear — what does the fear and greed index say right now?”
Daily crypto briefing
“Give me a quick market mood check for crypto — what's the fear and greed score today and how is it classified?”
Technical details
Endpoint
GEThttps://api.polyform.org/v1/crypto/fear-greed?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, no-auth, pay-per-call crypto sentiment score without setting up API keys or accounts. Ideal for agents that need occasional market mood checks at minimal cost ($0.002/call) via USDC micropayment on Base. Prefer over alternative.me direct if you want a machine-payable, agent-native interface with no signup friction.
Side effects
- Upstream alternative.me data unavailable — stale or missing response
- Payment failure via x402 — 402 returned if USDC micropayment not completed
- Rate or network issues on Base blockchain for payment verification
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"asOf": "2026-09-28T00:00:00.000Z",
"scale": "0=extreme fear, 100=extreme greed",
"value": 45,
"source": "alternative.me Crypto Fear & Greed Index",
"classification": "Fear"
}
}Tags
x402
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