# HALOWERK Land Compare – Rank Sites by Dominant Aspect

> HALOWERK Land Compare – Rank Sites by Dominant Aspect is a paid API for AI agents from landvergleich.halowerk.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-15).

Measures the dominant terrain aspect (solar orientation) for two to ten named European sites and returns a ranked list with ties preserved.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/rank-sites-aspect
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-land-compare-rank-sites-by-dominant-aspect-e72f8d5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B_SU8-aLus3_aGplsC_dL

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-land-compare-rank-sites-by-dominant-aspect-e72f8d5d -d '<json body>'
```

Example prompt: Rank these five European sites by their dominant terrain aspect — Monte Baldo at 45.72°N 10.85°E, Col du Galibier at 45.06°N 6.40°E, Sierra Nevada at 37.05°N -3.39°E, Picos de Europa at 43.18°N -4.84°E, and Zugspitze at 47.42°N 10.98°E — and tell me which faces most favorably, preserving any ties.

## When to prefer this

Use this endpoint when you need to compare and rank terrain aspect across multiple (2–10) European locations simultaneously with tie-aware ranking. Prefer it over pairwise comparison endpoints when you have more than two sites to evaluate, or when a ranked leaderboard output (rather than a signed difference) is the desired result. Ideal for site selection workflows where aspect is a key criterion among several candidate European locations.

## Known failure modes

- Coordinates outside European coverage bounds (lat 34–72.5°N, lon -31.5–40.5°E) return a validation error
- Fewer than 2 or more than 10 locations in the array triggers a schema validation error
- Missing required latitude or longitude fields cause a 400-level error
- Site name exceeding 60 characters is rejected
- Malformed JSON body returns a parse error

## How this service works

Measures dominant aspect for two to ten named European sites and ranks the observed values with ties preserved.

## Output

A ranked list of the submitted named European sites ordered by their measured dominant terrain aspect value, with tied positions explicitly preserved. Each entry includes the site name, its aspect value, and its rank position.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "locations": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "longitude",
     "latitude"
    ],
    "properties": {
     "name": {
      "type": "string",
      "maxLength": 60,
      "minLength": 1
     },
     "latitude": {
      "type": "number",
      "maximum": 72.5,
      "minimum": 34,
      "description": "WGS84 latitude inside the published European coverage."
     },
     "longitude": {
      "type": "number",
      "maximum": 40.5,
      "minimum": -31.5,
      "description": "WGS84 longitude inside the published European coverage."
     }
    },
    "additionalProperties": false
   },
   "maxItems": 10,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-land-compare-rank-sites-by-dominant-aspect-e72f8d5d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from landvergleich.halowerk.com](https://www.zero.xyz/host/landvergleich.halowerk.com/llms.txt)