# booAIP Fear & Greed Index

> booAIP Fear & Greed Index is a paid API for AI agents from booaip.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns the current crypto Fear & Greed Index value, 1-day change, and sentiment classification (e.g. Greed, Fear)

## Facts

- Endpoint: GET https://booaip.vercel.app/api/feargreed
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/booaip-fear-greed-index-70b4e197
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HjV8x9RdMLw8S9DuUkzdf

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 booaip-fear-greed-index-70b4e197
```

Example prompt: What's the current crypto Fear and Greed Index — give me the score, how it changed since yesterday, and whether we're in fear or greed territory right now?

## When to prefer this

Use this endpoint when an AI agent needs real-time crypto market sentiment data priced affordably at $0.005 USDC per call, payable via x402 on Base, without requiring an API key subscription — ideal for pay-per-use agent workflows needing the Fear & Greed Index.

## Known failure modes

- Payment not included or insufficient USDC — returns 402 Payment Required
- Upstream data source unavailable — returns 5xx error
- Invalid or expired x402 payment token — returns 401 or 402
- Network timeout from Vercel cold start — returns 504

## How this service works

Current crypto Fear & Greed Index with 1-day change (alternative.me).

## Output

Returns a JSON object with: 'value' (integer 0-100 representing the index), 'change1d' (integer showing 24-hour change), and 'classification' (string like 'Greed', 'Fear', 'Extreme Fear', 'Extreme Greed') describing overall crypto market sentiment.

## 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": [
      "GET"
     ],
     "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",
     "properties": {
      "value": {
       "type": "number"
      },
      "change1d": {
       "type": "number"
      },
      "classification": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "value": 55,
  "change1d": 3,
  "classification": "Greed"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/booaip-fear-greed-index-70b4e197/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from booaip.vercel.app](https://www.zero.xyz/host/booaip.vercel.app/llms.txt)