# WorldData402 Crypto Fear & Greed Index

> WorldData402 Crypto Fear & Greed Index is a paid API for AI agents from worlddata402.worlddata402.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Returns the current and historical Crypto Fear & Greed Index values indicating overall market sentiment

## Facts

- Endpoint: GET https://worlddata402.worlddata402.workers.dev/v1/crypto/fear-greed?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/worlddata402-crypto-fear-greed-index-c9d99ae8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yjNjzgrtd-9IzOeijsg5U

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 worlddata402-crypto-fear-greed-index-c9d99ae8
```

Example prompt: What's the current crypto fear and greed index? Show me the last 7 data points so I can see the recent trend.

## When to prefer this

Choose this endpoint when you need real-time or recent historical Crypto Fear & Greed Index data as a market sentiment signal, particularly within an AI agent workflow that can handle x402 micropayments in USDC on Base. Prefer it over scraping alternative.me directly when you need a reliable, pay-per-call API without API key management. Ideal for trading bots, portfolio dashboards, or sentiment-based alerting systems.

## Known failure modes

- Invalid or non-integer limit parameter returns a 400 error
- Upstream data source unavailable causes a 503 or empty response
- Payment not completed over x402 results in a 402 Payment Required response
- Requesting more historical data points than available may return fewer records than requested

## How this service works

Global market, government and reference data for AI agents. Pay-per-call over x402 (USDC on Base mainnet).

## Output

Returns one or more data points from the Crypto Fear & Greed Index, each containing a numeric score (0–100), a sentiment classification label (e.g. Extreme Fear, Fear, Neutral, Greed, Extreme Greed), and a timestamp. When limit is specified, returns that many historical records ordered from most recent.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/worlddata402-crypto-fear-greed-index-c9d99ae8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from worlddata402.worlddata402.workers.dev](https://www.zero.xyz/host/worlddata402.worlddata402.workers.dev/llms.txt)