# Crypto Market Sentiment & Fear/Greed Index

> Crypto Market Sentiment & Fear/Greed Index is a paid API for AI agents from crypto-market-data.zafermemon87.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Returns the Crypto Fear & Greed index (current and previous value), trending coins, market breadth, mood classification, and volatility regime in a single snapshot.

## Facts

- Endpoint: GET https://crypto-market-data.zafermemon87.workers.dev/v1/sentiment?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-market-sentiment-fear-greed-index-840cf60a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YLqOCCDxcGN1fLblXNvLm

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-market-sentiment-fear-greed-index-840cf60a
```

Example prompt: What's the current crypto fear and greed index, overall market mood, and top 5 trending coins right now?

## When to prefer this

Choose this endpoint when you need a holistic crypto sentiment snapshot in a single call — combining Fear & Greed index history, trending coin momentum, market breadth, mood label, and volatility regime. It is ideal for pre-trade context, morning briefings, or automated sentiment monitoring. Prefer this over individual price or funding-rate endpoints when the primary question is 'what is the overall market feeling right now?' rather than deep per-coin analytics.

## Known failure modes

- Invalid limit parameter (outside 1-7 range) returns a validation error
- Data may be up to 60 seconds stale (data_age_s reflects this)
- Payment required (402) if x402 micropayment header is missing or invalid
- Upstream data source outage may cause stale or empty trending coin list
- Network timeout on the Cloudflare Worker edge node

## How this service works

Crypto Fear and Greed index with the previous value, trending coins, market breadth, mood and volatility regime.

## Output

Returns a JSON object containing: current Fear & Greed index value and label (e.g. Neutral 50), previous Fear & Greed value, overall market mood (e.g. Risk-off), mood score, list of up to 7 trending coins with token symbol, rank, and 24h price change percentage, market breadth ratios (fraction of coins up in last 1h and 24h), volatility regime (e.g. normal), 24h total crypto volume in USD, BTC share of volume, data age in seconds, and a plain-English summary string.

## 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"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 7,
       "minimum": 1,
       "description": "How many trending coins (1-7, default 7)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mood": "Risk-off",
  "note": "Public market data, refreshed every minute. Not financial advice.",
  "tool": "sentiment",
  "as_of": "2026-10-23T20:03:00+05:30",
  "plain": "Fear & Greed 50 (Neutral, was 68); mood Risk-off; trending: UHI, DACITY, PEARL, AERO, PENGU.",
  "engine": "data-1.0",
  "breadth": {
   "up_1h": 0.2,
   "up_24h": 0.28
  },
  "charged": true,
  "trending": [
   {
    "name": "Universal High Income",
    "rank": 1,
    "token": "UHI",
    "change_24h_pct": 16.37
   },
   {
    "name": "Dacity Coin",
    "rank": 2,
    "token": "DACITY",
    "change_24h_pct": 175.01
   }
  ],
  "price_usd": null,
  "data_age_s": 60,
  "fear_greed": {
   "label": "Neutral",
   "value": 50,
   "previous": 68
  },
  "mood_score": -3,
  "snapshot_seal": "eb08dce6d854951431a0fb2732282227e1d954ec072422c9bfc5bee2f3ed695f",
  "volume_24h_usd": 3131469154,
  "volatility_regime": "normal",
  "btc_share_of_volume": 0.343
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-market-sentiment-fear-greed-index-840cf60a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from crypto-market-data.zafermemon87.workers.dev](https://www.zero.xyz/host/crypto-market-data.zafermemon87.workers.dev/llms.txt)