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BaseBuilder Sentiment Fear & Greed Index
x402
BaseBuilder Sentiment Fear & Greed Index is a paid API for AI agents from bbx-sentiment.vercel.app, paid per call via x402, $0.161038/call, status unknown (last checked 2026-10-30).
Returns a fear and greed sentiment score for crypto/financial markets using the Fear-Greed index methodology
Price / call$0.161038
Success—
StatusUnknown
How this service works
BaseBuilder Sentiment API hub - 14 paid endpoints
Output
Returns a numerical fear-greed index score and a categorical sentiment label (e.g. Extreme Fear, Fear, Neutral, Greed, Extreme Greed) reflecting current market sentiment, computed from market signals.
Example use cases
Daily crypto trading sentiment check
“Before I make any trades today, what does the crypto fear and greed index say? Is the market in fear or greed territory right now?”
Market timing for portfolio rebalancing
“I'm thinking of buying more crypto — can you check the current fear and greed sentiment score so I know if the market is oversold or overheated?”
Automated sentiment monitoring alert
“Check the fear and greed index for me and let me know whether we're in extreme fear, fear, neutral, greed, or extreme greed today so I can update my trading strategy.”
Technical details
Endpoint
POSThttps://bbx-sentiment.vercel.app/api/sentiment/fear-greed?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a structured, scored fear-greed sentiment reading for crypto markets via a pay-per-call micropayment model (x402/USDC). Prefer it over free alternatives when operating in an agent pipeline that already handles x402 payments, or when you need a reliable, hosted API without managing API keys. Best for agents doing periodic market sentiment checks or trading strategy inputs.
Side effects
- Missing or malformed POST body returns 400 error
- Payment not included or insufficient USDC balance triggers 402 Payment Required
- Service temporarily unavailable returns 500 or 503
- Rate limiting may occur under high request volume
- Stale data if underlying market data feed is delayed
Tags
x402
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