# Arch Tools — Crypto Fear & Greed Index

> Arch Tools — Crypto Fear & Greed Index is a paid API for AI agents from archtools.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Fetches the current or historical Crypto Fear & Greed Index values to gauge overall cryptocurrency market sentiment

## Facts

- Endpoint: POST https://archtools.dev/v1/tools/crypto-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/arch-tools-crypto-fear-greed-index-c4dd68bc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_59HnxJSz60cefRz9kC3BO

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 arch-tools-crypto-fear-greed-index-c4dd68bc -d '<json body>'
```

Example prompt: What's the current crypto fear and greed index? Pull the latest reading so I know whether the market is in fear or greed right now.

## When to prefer this

Choose this endpoint when you need a quick, paid-per-call lookup of the Crypto Fear & Greed Index without managing your own data pipeline or API keys. It is ideal for AI agents that need real-time or recent historical market sentiment in a single lightweight call, especially within workflows already using USDC micropayments on Base. Prefer alternatives if you need very deep historical data, raw on-chain sentiment signals, or free access to the index.

## Known failure modes

- Invalid limit value (non-integer or out-of-range) may return a 400 error
- Upstream data provider unavailability may cause delayed or missing index data
- Payment failure over x402/USDC may result in 402 response before data is returned
- Requesting more historical entries than are available may return fewer results than requested

## How this service works

Arch Tools — crypto-fear-greed

## Output

Returns one or more Fear & Greed Index entries, each containing a numeric score (0–100), a sentiment label (e.g. 'Extreme Fear', 'Fear', 'Neutral', 'Greed', 'Extreme Greed'), and a timestamp. The number of entries returned corresponds to the 'limit' parameter, with limit=1 returning only the current reading.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "default": 1,
   "description": "Number of historical entries (1 = current)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arch-tools-crypto-fear-greed-index-c4dd68bc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from archtools.dev](https://www.zero.xyz/host/archtools.dev/llms.txt)