# BaseBuilder Sentiment Fear & Greed Index

> BaseBuilder Sentiment Fear & Greed Index is a paid API for AI agents from bb-sentiment.vercel.app, paid per call via x402, $0.161038/call, status unknown (last checked 2026-09-15).

Returns the current crypto Fear & Greed index score and sentiment classification for market mood analysis

## Facts

- Endpoint: POST https://bb-sentiment.vercel.app/api/sentiment/fear-greed
- Price: $0.161038/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-sentiment-fear-greed-index-002c78c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GGvjXjX6Hvv9jCbcJVhn8

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability basebuilder-sentiment-fear-greed-index-002c78c2 -d '<json body>'
```

Example prompt: What's the current crypto fear and greed index score right now — is the market in extreme fear, fear, neutral, greed, or extreme greed?

## When to prefer this

Use this endpoint when you need a real-time or near-real-time fear and greed index score for the cryptocurrency market, especially when building trading assistants, portfolio analysis tools, or market mood dashboards that need a quick scalar sentiment signal rather than raw social media sentiment analysis.

## Known failure modes

- Payment not provided or insufficient USDC — returns 402 Payment Required
- Invalid or malformed POST body — returns 400 Bad Request
- Upstream data source unavailable — returns 503 or 500 error
- Rate limit exceeded — returns 429 Too Many Requests

## How this service works

BaseBuilder Sentiment API hub - 14 paid endpoints

## Output

A fear and greed index score (typically 0-100) along with a sentiment classification label such as 'Extreme Fear', 'Fear', 'Neutral', 'Greed', or 'Extreme Greed', representing the current overall mood of the cryptocurrency market.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-sentiment-fear-greed-index-002c78c2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-sentiment.vercel.app](https://www.zero.xyz/host/bb-sentiment.vercel.app/llms.txt)