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SperaxOS Fear & Greed Index API
x402
SperaxOS Fear & Greed Index API is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).
Returns the current crypto market Fear & Greed Index score and sentiment label, payable per-request via x402 USDC on Base
Price / call$0.001
Success—
StatusUnknown
How this service works
AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.
Output
Returns the current Fear & Greed Index numeric score (typically 0–100) and a sentiment label (e.g. Extreme Fear, Fear, Neutral, Greed, Extreme Greed), along with a timestamp indicating when the reading was recorded.
Example use cases
Real-time market sentiment check
“What's the current fear and greed index for crypto? I want to know if the market is in extreme fear or greed before I make a move.”
DeFi trading signal monitoring
“Check the crypto fear and greed index for me — I'm trying to decide if now is a contrarian buying opportunity or if greed is still running too hot.”
Automated sentiment alert workflow
“Pull the current crypto market fear and greed score so I can log it alongside my portfolio snapshot for today.”
Technical details
Endpoint
GEThttps://chat.sperax.io/api/x402/intel/fear-greed?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when you need a real-time, pay-per-use crypto market sentiment signal without managing API keys. It is ideal for AI agents operating with on-chain USDC wallets on Base that need to integrate market mood into DeFi decisions, trading strategies, or portfolio monitoring workflows. Use it over free alternatives when freshness and programmable micropayment access are priorities.
Side effects
- Payment not included or insufficient USDC — returns 402 Payment Required
- Base network congestion causing payment verification delay — timeout or retry needed
- Index data temporarily unavailable from upstream provider — may return 503 or stale data
- Malformed x402 payment header — returns 400 Bad Request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Tags
x402
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