# Crypto Fear & Greed Index API

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

Returns the current Crypto Fear & Greed Index score (0=extreme fear, 100=extreme greed) with weekly trend data as a contrarian market-sentiment signal

## Facts

- Endpoint: POST https://x402-services-production.up.railway.app/api/predict/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/crypto-fear-greed-index-api-9c831d92
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_emArbQaiG58vEAW87VXQa

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-9c831d92 -d '<json body>'
```

Example prompt: What's the current crypto Fear & Greed Index score and has sentiment been trending more fearful or greedy this week?

## When to prefer this

Use this endpoint when you need a quick, single-call snapshot of overall crypto market sentiment using the widely-recognized Fear & Greed Index metric, especially for contrarian trading signals or market timing analysis. Prefer this over raw price data endpoints when you want a synthesized sentiment score rather than individual asset metrics.

## Known failure modes

- Empty or malformed request body may return 400 error
- Upstream data source unavailability may return 503 or stale data
- Payment not processed correctly may return 402 Payment Required

## How this service works

Crypto Fear & Greed index (0=extreme fear, 100=extreme greed) with weekly trend — a contrarian market-sentiment signal. Send {}.

## Output

Returns the current Fear & Greed Index score on a 0-100 scale (0=extreme fear, 100=extreme greed), a sentiment classification label, and a weekly trend indicating whether market sentiment is improving or deteriorating.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "_": {
   "type": "string",
   "description": "No parameters"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-fear-greed-index-api-9c831d92/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-services-production.up.railway.app](https://www.zero.xyz/host/x402-services-production.up.railway.app/llms.txt)