# HALOWERK Southern Land – Malta Terrain Ruggedness Index

> HALOWERK Southern Land – Malta Terrain Ruggedness Index is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the standard deviation of sampled surface elevations (terrain ruggedness) for a coordinate within Malta's boundary.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/mt-ruggedness
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-southern-land-malta-terrain-ruggedness-index-ff127239
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yhG07VccDLodeTOXgmQpA

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-southern-land-malta-terrain-ruggedness-index-ff127239 -d '<json body>'
```

Example prompt: What's the terrain ruggedness at latitude 35.9 and longitude 14.4 in Malta? I need the standard deviation of surface elevations for that spot.

## When to prefer this

Use this endpoint when you need a quantitative measure of terrain roughness or variability specifically for a location in Malta, derived from surface elevation sampling. It is ideal for land suitability analysis, construction feasibility, agricultural planning, or environmental modeling within the Maltese territory. Choose it over generic elevation APIs when you need a ruggedness statistic (standard deviation of elevations) rather than a raw elevation value, and when geographic validation against Malta's official boundary is required.

## Known failure modes

- Coordinate outside Malta's Natural Earth boundary — request rejected before payment is processed
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Invalid or missing coordinate fields — schema validation failure
- No elevation data available for the given point — empty or null result

## How this service works

Standard deviation of sampled surface elevations. The coordinate is validated against the Natural Earth boundary for Malta; results outside it are rejected before payment.

## Output

A numeric value representing the standard deviation of sampled surface elevations at the given coordinate, indicating terrain ruggedness. Higher values mean more varied, uneven terrain; lower values indicate flatter ground. Coordinates outside Malta's Natural Earth boundary are rejected before payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "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."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-southern-land-malta-terrain-ruggedness-index-ff127239/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)