# Crypto Fear & Greed Index

> Crypto Fear & Greed Index is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).

Returns the current Crypto Fear & Greed Index (0–100) plus up to 365 days of daily historical values as a market-sentiment signal.

## Facts

- Endpoint: GET https://bess-x402.onrender.com/v1/crypto/fear-greed?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-fear-greed-index-55b29561
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tx_uJvIwyDBj8GTqGDAMA

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-55b29561
```

Example prompt: What's today's Crypto Fear & Greed Index score, and can you show me the daily readings for the past 30 days so I can see how sentiment has shifted?

## When to prefer this

Use this endpoint when you need a ready-made, normalized 0–100 sentiment index for the overall crypto market — particularly for newsletters, trading filters, or dashboards that need a quick market-mood signal without computing sentiment from raw data. It is more convenient than aggregating social media or on-chain signals yourself, and its daily-history feature makes it suitable for trend analysis over any window up to one year.

## Known failure modes

- Invalid 'days' value outside 1–365 range returns a validation error
- Service unavailable on the hosted render.com instance causes a 503 response
- Payment not fulfilled (x402 protocol) results in a 402 Payment Required response
- Requesting future dates or data beyond available history may return fewer records than requested

## How this service works

The Crypto Fear & Greed Index (0 extreme fear to 100 extreme greed) for today, with up to a year of daily history. Use as a market-sentiment signal for trading, newsletters or answering how the crypto market feels.

## Output

Returns the current day's Fear & Greed Index score (0 = extreme fear, 100 = extreme greed) with a sentiment label, and optionally an array of daily historical index values (date + score + label) going back up to 365 days.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "days": {
       "type": "integer",
       "description": "Days of history (1-365)"
      }
     }
    }
   },
   "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-55b29561/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bess-x402.onrender.com](https://www.zero.xyz/host/bess-x402.onrender.com/llms.txt)