# Carbon & Cashmere Anomaly Detection API (ETH)

> Carbon & Cashmere Anomaly Detection API (ETH) 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).

Detects statistical anomalies in Ethereum market data using STL decomposition, z-score analysis, and Isolation Forest ML ensemble, returning a severity rating and top anomaly drivers.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/anomaly/ETH
- 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/carbon-cashmere-anomaly-detection-api-eth-e46cc43d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_APwRynJlet9-fiINydL69

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-anomaly-detection-api-eth-e46cc43d
```

Example prompt: Check if Ethereum is showing any statistically anomalous behavior right now — I want the anomaly score, severity level, and what the top drivers are across volume, funding rate, and returns.

## When to prefer this

Use this endpoint when you need a multi-method statistical anomaly assessment for ETH specifically — combining STL decomposition, z-scores across volume/funding/returns, and an Isolation Forest ML outlier score in one call. Prefer this over simple price APIs when you need a composite anomaly signal with severity classification and feature attribution, rather than raw price data.

## Known failure modes

- Invalid or unsupported symbol in URL path — 404 or empty response
- Payment not processed — 402 Payment Required if x402 header is missing or underfunded
- Rate limiting or service unavailability — 429 or 503 responses
- Stale or missing underlying data causing null or incomplete z-score fields

## How this service works

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

## Output

Returns a JSON object with an anomaly_flag (boolean), anomaly_score (0–1), severity label (e.g. 'elevated'), STL residual z-score and seasonal strength, z-scores for volume/funding/returns, an Isolation Forest outlier score and is_outlier flag, and a ranked list of top contributing features with their values and contribution weights. Includes a disclaimer noting data is for informational research only.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "_meta": {
   "disclaimer": "Informational research data only — not investment advice."
  },
  "symbol": "BTC",
  "methods": {
   "stl": {
    "residual_z": 2.1,
    "seasonal_strength": 0.34
   },
   "zscore": {
    "volume_z": 3.1,
    "funding_z": -1.2,
    "returns_z": 2.8
   },
   "isoforest": {
    "score": -0.18,
    "is_outlier": true
   }
  },
  "severity": "elevated",
  "top_drivers": [
   {
    "value": 3.1,
    "feature": "volume_z",
    "contribution": 0.42
   }
  ],
  "anomaly_flag": true,
  "anomaly_score": 0.73
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-anomaly-detection-api-eth-e46cc43d/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)