# Carbon Cashmere Crypto ML Feature Vector API

> Carbon Cashmere Crypto ML Feature Vector API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns 34 quantitative ML features across 10 categories (price returns, volatility, volume, momentum, sentiment, HMM regimes, orderbook, options, IV) for a single cryptocurrency

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/features/:var1
- 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/api-carbon-cashmere-de-088e90f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4k1sqQbsA8dhxEkKOPv3t

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-088e90f3
```

Example prompt: Pull the full 34-feature ML vector for BTC from Carbon Cashmere — I need the price returns, volatility, RSI, MACD, Fear & Greed, HMM regime probabilities, orderbook imbalance, put/call ratio, and implied volatility to feed into my model.

## When to prefer this

Choose this endpoint when you need a pre-computed, ready-to-use ML feature vector for a single cryptocurrency combining multiple signal categories (technical, sentiment, microstructure, derivatives) into one call. Ideal for feature engineering pipelines, custom ML model inference, and quantitative crypto research where you want a curated set of 34 standardized features rather than assembling them from multiple data sources yourself.

## Known failure modes

- Unsupported coin ticker returns 400 or 422 — only 34 specific tickers are supported (BTC, ETH, SOL, etc.)
- Payment failure (x402) if USDC not provided — endpoint costs $0.01 USDC per call
- Upstream data unavailability for options or orderbook features may return partial or null values
- Rate limiting if too many requests are made in short succession
- Network timeout if upstream data sources are slow to respond

## How this service works

Get 34 quantitative ML features across 10 categories — price returns, volatility (7d/30d), volume ratio, RSI/MACD momentum, Fear & Greed sentiment, HMM regime probabilities, orderbook imbalance, options put/call ratio, implied volatility. Per-coin feature vector for BTC, ETH, SOL, and more. AI agent API for feature engineering, custom ML model input, and quantitative crypto research.

## Output

A JSON object containing the coin ticker, a feature_count integer (34), and a features object with 34 named quantitative values spanning 10 categories: price returns, 7d/30d volatility, volume ratio, RSI momentum, MACD momentum, Fear & Greed sentiment, HMM regime probabilities, orderbook bid/ask imbalance, options put/call ratio, and implied volatility.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "coin"
     ],
     "properties": {
      "coin": {
       "enum": [
        "AAVE",
        "ADA",
        "APT",
        "ARB",
        "ATOM",
        "AVAX",
        "BCH",
        "BNB",
        "BTC",
        "DOGE",
        "DOT",
        "ETC",
        "ETH",
        "HBAR",
        "HYPE",
        "ICP",
        "KAS",
        "LINK",
        "LTC",
        "MATIC",
        "NEAR",
        "ONDO",
        "OP",
        "SKY",
        "SOL",
        "SUI",
        "TAO",
        "TON",
        "TRX",
        "UNI",
        "XLM",
        "XMR",
        "XRP",
        "ZEC"
       ],
       "type": "string",
       "examples": [
        "AAVE",
        "ADA",
        "APT",
        "ARB",
        "ATOM",
        "AVAX",
        "BCH",
        "BNB",
        "BTC",
        "DOGE"
       ],
       "description": "Cryptocurrency ticker symbol (uppercase). 34 supported coins."
      }
     },
     "additionalProperties": false
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "coin": {
       "type": "string"
      },
      "features": {
       "type": "object"
      },
      "feature_count": {
       "type": "integer"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-088e90f3/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)