# HALOWERK Land Compare – Two-Point Aspect Comparison

> HALOWERK Land Compare – Two-Point Aspect Comparison is a paid API for AI agents from landvergleich.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-14).

Measures the dominant terrain aspect (compass-facing direction) at exactly two European coordinates and returns the signed difference plus which location wins.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-aspect
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-land-compare-two-point-aspect-comparison-83dd348d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_URk6_so7OQXohV6bjAU9M

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-two-point-aspect-comparison-83dd348d -d '<json body>'
```

Example prompt: Compare the dominant terrain aspect between my two candidate sites — location A at latitude 47.2, longitude 8.5 (near Zurich) and location B at latitude 44.8, longitude 11.6 (near Bologna) — and tell me which one faces more favorably and by how much.

## When to prefer this

Choose this endpoint when you need a precise, point-in-time comparison of terrain aspect (compass-facing direction) between exactly two European locations. It is ideal for site-selection tasks — solar farm placement, vineyard selection, building orientation — where knowing which of two specific coordinates has a more favorable aspect is the core question. Prefer this over the ranking endpoint (which handles 2–10 sites) when you have exactly two candidates and want a clean binary comparison with a signed difference.

## Known failure modes

- Coordinates outside European coverage bounds (latitude 34–72.5°N, longitude −31.5–40.5°E) return a validation error
- Fewer or more than exactly 2 locations in the array returns a schema validation error
- Malformed or missing latitude/longitude fields cause a 400-level error
- Flat terrain with no meaningful aspect difference may return a null or tied winner
- Network timeouts possible for slow elevation data retrieval

## How this service works

Measures dominant aspect for exactly two European coordinates with one method and reports the signed difference and winner where meaningful.

## Output

Returns the dominant terrain aspect value (compass direction) for each of the two input coordinates, the signed numeric difference between them, and an indication of which location wins in terms of aspect orientation — useful for comparing sun-facing terrain characteristics across two European sites.

## 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": 2,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-land-compare-two-point-aspect-comparison-83dd348d/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)