# Carbon Cashmere BTC Feature Data

> Carbon Cashmere BTC Feature Data is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).

Returns a comprehensive set of real-time and derived feature metrics for Bitcoin (BTC), including technical indicators, on-chain analytics, order book microstructure, and ML-ready signals.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/features/BTC
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-156a6f49
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wl65KMqLtkY4aR1J-vRat

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 api-carbon-cashmere-de-156a6f49
```

Example prompt: Pull the full BTC feature dataset from Carbon Cashmere right now — I need the RSI-14, MACD signal, fear and greed index, funding rate, volatility, bid/ask wall ratios, and all on-chain metrics like CDD and average coin age for Bitcoin.

## When to prefer this

Choose this endpoint when you need a broad, pre-aggregated set of Bitcoin features — technical indicators, on-chain signals, microstructure, and options data — in a single call, especially for ML model inference, quant research, or building a dashboard. Prefer it over assembling individual data streams when you need a comprehensive feature vector for BTC specifically and want to avoid multiple API round-trips.

## Known failure modes

- Payment not provided or invalid: 402 Payment Required
- Unsupported coin ticker in path: 400 Bad Request or empty features
- Upstream data source unavailable: some feature values may be null
- Rate limit exceeded: 429 Too Many Requests
- Network timeout: 504 Gateway Timeout

## How this service works

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

## Output

A JSON object containing the coin ticker ('BTC') and a 'features' map with dozens of named numeric metrics including RSI-14, MACD signal, Bollinger Band position, fear/greed index, 1h/24h/7d returns, funding rate, volatility, order book wall ratios, put/call ratio, taker buy ratio, mempool urgency, CDD ratio, average coin age, implied volatility ATM, OI change, regime encoding, spread in bps, bid/ask imbalance, supply percent mined, and more. Also includes a 'feature_count' integer.

## 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/api-carbon-cashmere-de-156a6f49/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)