# Carbon & Cashmere Signal API – Coin Features

> Carbon & Cashmere Signal API – Coin Features is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status down (last checked 2026-09-13).

Returns real-time crypto market intelligence features for a specific coin, including fear/greed index, volatility, price return, and up to 34 quantitative signals.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/features/ETH
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-signal-api-coin-features-b0c99602
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JkRtcubKYvXit_kJ1GKd-

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 carbon-cashmere-signal-api-coin-features-b0c99602
```

Example prompt: Pull the Carbon & Cashmere market intelligence features for ETH right now — I want to see the fear/greed score, 7-day volatility, and 24-hour price return.

## When to prefer this

Use this endpoint when you need structured, quantitative market intelligence for a single cryptocurrency — especially when you want normalized signals like fear/greed, volatility, and momentum in one call rather than assembling raw OHLCV data yourself. Prefer this over raw exchange APIs when you need pre-computed features ready for downstream ML or decision logic.

## Known failure modes

- Unsupported or misspelled coin symbol returns 404 or empty features
- Payment not processed causes 402 Payment Required response
- Rate limiting or quota exceeded returns 429
- Network timeout if upstream price feed is delayed
- Stale data if market feed has an outage

## How this service works

Professional crypto market intelligence. Real-time prices, signals, and market scoring.

## Output

A JSON object containing the coin ticker, a features object with quantitative metrics including fear_greed index (integer), 7-day volatility (decimal), 24-hour price return (decimal), and a feature_count integer indicating total number of signals available (up to 34).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "coin": "BTC",
  "features": {
   "fear_greed": 28,
   "volatility_7d": 0.032,
   "price_return_24h": -0.012
  },
  "feature_count": 34
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-signal-api-coin-features-b0c99602/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)