# Crypto Fear & Greed Index

> Crypto Fear & Greed Index is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-17).

Returns the current Crypto Fear & Greed Index score (0–100) with day-over-day change and optional historical data up to 30 days

## Facts

- Endpoint: GET https://402.com.tr/api/x402/fear-greed?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-fear-greed-index-8a913f2e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7_oTgZ7EtrMc6tuxGPQ5m

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 crypto-fear-greed-index-8a913f2e
```

Example prompt: What's the current crypto Fear & Greed Index, and can you show me how it's changed over the last 7 days?

## When to prefer this

Choose this endpoint when you need a single, standardized crypto market sentiment score without building your own aggregation logic. It is ideal for agents that need to contextualize market conditions before executing trades, rebalancing portfolios, or generating market commentary. Prefer it over raw price feeds when the goal is mood or risk-level classification rather than exact price data.

## Known failure modes

- days parameter exceeds 30 — capped or returns error
- Network or upstream alternative.me outage returns unavailable data
- Invalid days value (non-numeric) causes a 400-level error
- Payment not completed results in 402 Payment Required response

## How this service works

The crypto Fear & Greed Index (alternative.me): 0 = extreme fear, 100 = extreme greed, from volatility, momentum, volume, social and dominance — plus the day-over-day change and recent history. The one-number market-mood read an agent uses to size risk. Pass days= for history (up to 30). A sentiment gauge, not a signal. Not financial advice.

## Output

Returns the current Fear & Greed Index score (0 = extreme fear, 100 = extreme greed), the named sentiment label (e.g. 'Fear', 'Greed', 'Neutral'), the day-over-day change, and an array of historical data points if days > 1 was requested — sourced from alternative.me and derived from volatility, momentum, volume, social signals, and BTC dominance.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "days": {
       "type": "string",
       "description": "History days (default 1, max 30)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-fear-greed-index-8a913f2e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402.com.tr](https://www.zero.xyz/host/402.com.tr/llms.txt)