# Crypto Fear & Greed Index API

> Crypto Fear & Greed Index API is a paid API for AI agents from asistent-crypto.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns the current and previous Crypto Fear & Greed Index values with sentiment classifications plus recent historical readings for contrarian market analysis.

## Facts

- Endpoint: POST https://asistent-crypto.vercel.app/api/x402/data/fear-greed
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-fear-greed-index-api-e34703ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lKAy0c0CtgpdtX7amg-bx

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-api-e34703ac -d '<json body>'
```

Example prompt: What's the current crypto fear and greed index — is the market in extreme fear, neutral, or extreme greed right now, and what has it been over the past few days?

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call sentiment gauge with no API key or account setup. It is ideal for contrarian analysis workflows — particularly when combined with funding rate data to distinguish genuine capitulation from crowded short scenarios. Prefer this over rolling your own sentiment aggregator when you need a well-known standardized index value with historical context in a single call.

## Known failure modes

- Upstream data provider outage causing stale or unavailable index data
- Payment failure or insufficient USDC balance preventing API access
- Network timeout on the Vercel edge function
- Index value temporarily unavailable during data refresh windows

## How this service works

Crypto Fear & Greed Index: current and previous value with classification, plus recent history. A contrarian input — extreme fear has historically marked accumulation zones and extreme greed distribution zones — but it is a filter, never a trigger on its own. Pair it with funding to separate real capitulation from a crowded short.

## Output

Returns the current Crypto Fear & Greed Index numeric value (0–100) with its sentiment classification (e.g. Extreme Fear, Fear, Neutral, Greed, Extreme Greed), the previous period's value and classification for comparison, and a recent historical series of index readings to identify trends.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [],
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    }
   },
   "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-api-e34703ac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from asistent-crypto.vercel.app](https://www.zero.xyz/host/asistent-crypto.vercel.app/llms.txt)