# HALOWERK Signal Fingerprint & Duplicate Checker

> HALOWERK Signal Fingerprint & Duplicate Checker is a paid API for AI agents from handel.halowerk.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-17).

Computes a versioned SHA-256 fingerprint for a trading signal and checks it against a caller-supplied list of known fingerprints to detect duplicates

## Facts

- Endpoint: POST https://handel.halowerk.com/v1/rechner/signal-fingerprint?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-signal-fingerprint-duplicate-checker-2f057d09
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_csSuDCiuTURSKYck49y5G

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-signal-fingerprint-duplicate-checker-2f057d09 -d '<json body>'
```

Example prompt: Check if this long signal on AAPL with entry 182.50, stop 178.00, and targets 190.00 and 195.00 is a duplicate — compare it against these known fingerprints: [abc123...64chars, def456...64chars].

## When to prefer this

Use this endpoint when you need a deterministic, reproducible fingerprint of a trading signal for deduplication or audit purposes, and you already hold all price data and signal parameters yourself. This is not a broker, not a data feed, and not a signal recommender — it is purely a hashing and comparison compute tool. Prefer it over custom hashing when you need a canonicalized, versioned SHA-256 that is consistent across systems, or when building deduplication logic into a multi-source signal aggregation pipeline.

## Known failure modes

- Invalid or out-of-range entry/stop/target prices return validation errors
- Symbol too short or too long (outside 2-24 chars) causes schema rejection
- known_fingerprints entries that are not exactly 64 characters are rejected
- Direction values other than 1 or -1 fail validation
- More than 1000 known fingerprints in the list triggers a limit error
- Missing required fields (symbol, direction, entry, stop, targets) cause 400-level errors

## How this service works

Signal-Fingerabdruck und Dublettenabgleich. Versionierter SHA-256 über fest kanonisiertes Signal; nur Abgleich mit gelieferter Liste, keine eigene Signalspeicherung. Alle Zahlen, Kurse und Vorgaben liefert der Aufrufer. Keine eigenen Kursdaten, kein Brokerzugriff, keine Ausführung. Rechenwerkzeug, keine Anlageberatung, keine Empfehlung.

## Output

Returns a versioned SHA-256 fingerprint of the canonicalized signal, and indicates whether that fingerprint matches any entry in the caller-supplied known_fingerprints list. No signal data is stored server-side; the service is purely a computation tool.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "signal": {
   "type": "object",
   "required": [
    "symbol",
    "direction",
    "entry",
    "stop",
    "targets"
   ],
   "properties": {
    "stop": {
     "type": "number",
     "maximum": 1000000000000,
     "exclusiveMinimum": 0
    },
    "entry": {
     "type": "number",
     "maximum": 1000000000000,
     "exclusiveMinimum": 0
    },
    "symbol": {
     "type": "string",
     "maxLength": 24,
     "minLength": 2
    },
    "targets": {
     "type": "array",
     "items": {
      "type": "number",
      "maximum": 1000000000000,
      "exclusiveMinimum": 0
     },
     "maxItems": 10,
     "minItems": 1
    },
    "direction": {
     "enum": [
      -1,
      1
     ],
     "type": "integer"
    }
   },
   "additionalProperties": false
  },
  "known_fingerprints": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 64,
    "minLength": 64
   },
   "maxItems": 1000,
   "minItems": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-signal-fingerprint-duplicate-checker-2f057d09/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from handel.halowerk.com](https://www.zero.xyz/host/handel.halowerk.com/llms.txt)