# HALOWERK marktwerk — Trading Volume Anomaly Detection

> HALOWERK marktwerk — Trading Volume Anomaly Detection is a paid API for AI agents from markt.netzhandwerker.de, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Detects statistically significant volume anomalies in cryptocurrency trading pairs across major exchanges using robust z-score analysis.

## Facts

- Endpoint: POST https://markt.netzhandwerker.de/anomaly/volume
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-marktwerk-trading-volume-anomaly-detection-e753d2af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J3CmcCnJb3PPWyPeHNs_f

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 halowerk-marktwerk-trading-volume-anomaly-detection-e753d2af -d '<json body>'
```

Example prompt: Check for volume anomalies on Binance for BTC/USDT and ETH/USDT over the last 24 hours using normal sensitivity — flag anything that looks statistically unusual.

## When to prefer this

Choose this endpoint when you need a statistically rigorous, ready-to-use volume anomaly signal for cryptocurrency pairs without building your own baseline logic. It is particularly suited for agents that need to act on volume spikes or drops in near-real-time across major exchanges. Prefer it over raw OHLCV feeds when you want an already-computed robust z-score rather than raw candle data.

## Known failure modes

- Requested trading pair not in the collector's watched_pairs list — returns empty or error for that symbol
- Exchange not supported — must be one of binance, coinbase, kraken, okx, bybit
- Invalid symbol format — must match BASE/QUOTE pattern like BTC/USDT
- Payment failure via x402 / insufficient USDC balance — request rejected with 402
- Lookback window with insufficient data — z-score may be unreliable or unavailable

## How this service works

HALOWERK marktwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

## Output

Returns a list of analyzed trading pairs with their robust z-scores, anomaly flags indicating whether volume deviates significantly from the baseline window, and the list of watched pairs the service currently tracks for the chosen exchange.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "venue": {
   "enum": [
    "binance",
    "coinbase",
    "kraken",
    "okx",
    "bybit"
   ],
   "type": "string",
   "default": "binance",
   "description": "Exchange whose recorded history is used."
  },
  "symbols": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^[A-Za-z0-9]{2,15}/[A-Za-z0-9]{2,15}$"
   },
   "maxItems": 20,
   "minItems": 1,
   "description": "Pairs as BASE/QUOTE. Only pairs the collector of this hub watches can be answered; watched_pairs in the answer lists them.",
   "uniqueItems": true
  },
  "lookback": {
   "enum": [
    "1h",
    "4h",
    "24h",
    "7d"
   ],
   "type": "string",
   "default": "24h",
   "description": "Length of the baseline window."
  },
  "sensitivity": {
   "enum": [
    "streng",
    "normal",
    "weit"
   ],
   "type": "string",
   "default": "normal",
   "description": "Threshold on the robust z value: streng 5, normal 3.5, weit 2.5."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-marktwerk-trading-volume-anomaly-detection-e753d2af/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from markt.netzhandwerker.de](https://www.zero.xyz/host/markt.netzhandwerker.de/llms.txt)