# HALOWERK Land Compare – Terrain Ruggedness Comparison (Two Points)

> HALOWERK Land Compare – Terrain Ruggedness Comparison (Two Points) is a paid API for AI agents from landvergleich.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Measures terrain ruggedness for exactly two European coordinates and returns the signed difference, individual values, and which location is more rugged.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-ruggedness
- Price: $0.006/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-terrain-ruggedness-comparison-two-points-4ae713bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-AIsGV0pNnVh9xgPgMV0S

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-terrain-ruggedness-comparison-two-points-4ae713bf -d '<json body>'
```

Example prompt: Compare the terrain ruggedness between the Cairngorms in Scotland (lat 57.1, lon -3.6) and the Ardennes in Belgium (lat 50.2, lon 5.7) — which location is more rugged and by how much?

## When to prefer this

Choose this endpoint when you need a direct pairwise ruggedness comparison between exactly two European locations with a signed difference and a clear winner. It is purpose-built for binary site comparisons rather than ranking multiple sites (use sibling multi-site endpoints for 2–10 locations) or retrieving a single-site ruggedness value. Ideal when the decision question is 'which of these two spots is more rugged and by how much?'

## Known failure modes

- Coordinates outside European coverage bounds (lat 34–72.5, lon -31.5–40.5) return a validation error
- Fewer or more than exactly 2 locations in the array cause a schema rejection
- Invalid or non-numeric latitude/longitude values result in a 400 error
- Payment failure via x402 protocol causes the request to be rejected before processing
- Network timeout if the underlying DEM or ruggedness data service is temporarily unavailable

## How this service works

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

## Output

Returns the terrain ruggedness index value for each of the two input coordinates, the signed difference (location A minus location B), and an indication of which location is the 'winner' (more rugged) 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-terrain-ruggedness-comparison-two-points-4ae713bf/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)