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Crypto Fear & Greed Index via x402
x402
Crypto Fear & Greed Index via x402 is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Returns the current Crypto Fear & Greed index value, zone, trend, historical averages, and momentum signals — paid per-call via USDC on Base with no API key required.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
Returns a JSON object with: current index value (0-100), zone label (e.g. 'Fear'), trend direction, signal (NEUTRAL/BUY/SELL), 1d/7d/30d changes, 7-day and 30-day averages, 30-day min and max, streak days in current zone, an array of historical data points (up to 30), a reasons array explaining the signal, and the data source URL and last-updated timestamp.
Example use cases
Pre-trade sentiment check
“Before I execute my ETH buy order, can you pull the crypto fear and greed index and tell me if we're in fear territory and how that compares to the 30-day average?”
Daily market mood briefing
“Every morning give me the crypto fear and greed index — today's score, whether it's fear or greed, and the 7-day trend so I know how sentiment has been moving.”
Contrarian entry signal
“Check the fear and greed index right now and flag if we've been in 'fear' zone for 5 or more consecutive days — I want to know if there's a contrarian buying streak building.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/fear-greed?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when your AI agent needs real-time crypto market sentiment data without managing API keys or subscriptions — ideal for trading bots, onchain agents, and DeFi automation that already handle x402 USDC micropayments on Base. Choose this over free alternatives when you need structured trend, streak, and historical context in a single call, or when building fully autonomous agents that pay for data programmatically per call.
Side effects
- Payment failure if agent wallet has insufficient USDC on Base — endpoint requires x402 micropayment before data is returned
- days parameter out of range (must be 0-30) returns a validation error
- Upstream data source (alternative.me) unavailability may cause stale or error responses
- Network timeout on the Cloudflare Worker edge node
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"zone": "fear",
"label": "Fear",
"trend": "falling",
"value": 34,
"avg_7d": 39.4,
"signal": "NEUTRAL",
"source": "https://alternative.me/crypto/fear-and-greed-index/",
"avg_30d": 47.1,
"history": [
{
"date": "2026-10-30",
"label": "Fear",
"value": 34
}
],
"max_30d": 66,
"min_30d": 28,
"reasons": [
"34 Fear, -12 vs 7d ago",
"below 30d avg 47.1"
],
"previous": {
"label": "Fear",
"value": 38
},
"change_1d": -4,
"change_7d": -12,
"change_30d": -20,
"updated_at": "2026-10-30T00:00:00Z",
"streak_days": 5
}
}Tags
x402
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