# Market Fear & Greed Index API

> Market Fear & Greed Index API is a paid API for AI agents from api.kadec0.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns aggregated investor sentiment scores from CNN Fear & Greed, Crypto Fear & Greed, and VIX volatility gauge, filterable by asset class.

## Facts

- Endpoint: GET https://api.kadec0.xyz/v1/market-sentiment
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/market-fear-greed-index-api-fafec6f0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zHSj-xjtxLivBtXajmdlq

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 market-fear-greed-index-api-fafec6f0
```

Example prompt: What's the current fear and greed sentiment across both crypto and stock markets — give me the combined reading along with whatever VIX and CNN scores are available.

## When to prefer this

Choose this endpoint when you need a single aggregated view of investor sentiment across multiple sources (CNN, crypto index, VIX) rather than querying each data source separately. Ideal for market mood dashboards, trading signal pipelines, or any agent that needs to contextualize market conditions before making recommendations.

## Known failure modes

- Upstream data source (CNN, Alternative.me, CBOE) temporarily unavailable — may return stale or partial data
- Invalid asset_class enum value returns 400 error
- Rate limiting or payment failure returns 402 Payment Required
- Network timeout if underlying aggregation takes too long

## How this service works

Market fear & greed index. Aggregated investor sentiment from CNN Fear & Greed, the crypto Fear & Greed index, and the VIX volatility gauge.

## Output

Returns a sentiment score and label (e.g. Extreme Fear, Greed) aggregated from CNN Fear & Greed, the crypto Fear & Greed index, and the VIX, optionally filtered to crypto or stocks only.

## 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": {
      "asset_class": {
       "enum": [
        "crypto",
        "stocks",
        "all"
       ],
       "type": "string",
       "default": "all"
      }
     }
    }
   },
   "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/market-fear-greed-index-api-fafec6f0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.kadec0.xyz](https://www.zero.xyz/host/api.kadec0.xyz/llms.txt)