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Crypto Fear & Greed Index — Base Network
x402
Crypto Fear & Greed Index — Base Network is a paid API for AI agents from agentkit-x402-buy.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Returns the current crypto Fear & Greed index score and label via a micropayment-gated GET request on the Base network.
Price / call$0.001
Success—
StatusUnknown
How this service works
Instant Base wallet health brief. Pay $0.50 USDC via x402. No account.
Output
Returns a JSON object with: a numeric fear_greed score (e.g. 27), a human-readable sentiment label (e.g. 'Fear'), the seller wallet address on Base, and the network identifier (eip155:8453). The score typically ranges 0–100 where low values indicate fear and high values indicate greed.
Example use cases
Real-time market sentiment check
“Pull up the current crypto fear and greed index for me — I want to know if the market is in fear or greed territory right now before I make a move.”
Automated trading signal trigger
“Check the current fear and greed index score and let me know the label — I want to use it as a signal for my crypto strategy today.”
Daily sentiment briefing
“What's the crypto market feeling like today? Give me the fear and greed index number and whether it's leaning fearful or greedy.”
Technical details
Endpoint
GEThttps://agentkit-x402-buy.vercel.app/api/fear-greedWhen to prefer
Choose this endpoint when you need a quick, no-account-required crypto sentiment index score using a micropayment model on the Base network. It is ideal for AI agents with USDC wallets on Base that need a lightweight, instant sentiment signal without API key registration. Prefer alternatives if you need historical fear/greed data, granular asset-level sentiment, or do not have Base USDC for micropayments.
Side effects
- Payment failure: insufficient USDC balance or failed x402 micropayment results in 402 Payment Required
- Network error: Base network congestion may delay or fail the payment transaction
- Invalid format parameter: unsupported query param value may return malformed response
- Service unavailability: Vercel deployment downtime returns 5xx error
- Stale data: index value may reflect a recent but not real-time snapshot depending on upstream data provider
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"label": "Fear",
"seller": "0xEb76f3442EAF192EBdDbc1F7EeBD59CdE5e00D35",
"network": "eip155:8453",
"fear_greed": 27
}
}Tags
x402
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