# Carbon & Cashmere Signal API – SOL Feature Vector

> Carbon & Cashmere Signal API – SOL Feature Vector 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 a 34-feature crypto market intelligence vector for Solana (SOL), including fear/greed index, volatility, price returns, and ML-ready signals.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/features/SOL
- 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-sol-feature-vector-6d3e7486
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BpKtuv9TOZZ9tpIvkcDtG

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-sol-feature-vector-6d3e7486
```

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

## When to prefer this

Use this endpoint when you need a rich, pre-computed feature vector for SOL specifically, combining sentiment (fear/greed), volatility, and return metrics in a single call. Prefer this over raw price feeds when you need ML-ready signals or market scoring without building your own feature pipeline.

## Known failure modes

- Invalid or unsupported coin ticker returns 404 or empty response
- Payment not processed (x402 protocol) results in 402 Payment Required
- Rate limit exceeded returns 429
- Stale or missing upstream data may result in null feature values
- Network timeout if upstream data providers are slow

## How this service works

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

## Output

A JSON object with the coin ticker (SOL), a named features object containing fear_greed index (0-100), 7-day volatility (decimal), 24h price return (decimal), and up to 34 total ML-ready feature fields for quantitative analysis or signal generation.

## 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-sol-feature-vector-6d3e7486/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)