# HALOWERK Land Compare - Elevation Comparison

> HALOWERK Land Compare - Elevation Comparison is a paid API for AI agents from landvergleich.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-13).

Compares elevation at exactly two European coordinates and returns the signed elevation difference plus which location is higher.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-elevation
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-land-compare-elevation-comparison-e280ac7f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DStJ5_iY9fs1Le1niBx5g

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-elevation-comparison-e280ac7f -d '<json body>'
```

Example prompt: Which is higher in elevation — Rome (41.9028° N, 12.4964° E) or Madrid (40.4168° N, 3.7038° W)? Give me the elevation difference and tell me which one wins.

## When to prefer this

Choose this endpoint when you need a precise, signed elevation comparison between exactly two European geographic points — ideal for site selection, urban comparison, or any workflow needing to know which of two locations sits higher above sea level. Prefer it over generic elevation APIs when you need a structured winner/difference output for European coordinates specifically.

## Known failure modes

- Coordinates outside the European coverage area (latitude 34–72.5°N, longitude −31.5–40.5°E) return a validation error
- Providing fewer or more than exactly two location objects returns a schema validation error
- Malformed coordinate values (non-numeric or out of range) are rejected
- Elevation data may be unavailable for very remote or data-sparse regions within coverage

## How this service works

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

## Output

Returns the measured elevation for each of the two input coordinates, the signed numerical difference between them (positive if the first is higher, negative if the second is higher), and an indication of which location has the greater elevation where the difference is meaningful.

## 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-elevation-comparison-e280ac7f/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)