# HALOWERK Eastern Land – Cyprus Terrain Ruggedness Index

> HALOWERK Eastern Land – Cyprus Terrain Ruggedness Index is a paid API for AI agents from ostland.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 index) for a given coordinate within Cyprus.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/cy-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-eastern-land-cyprus-terrain-ruggedness-index-d03b0266
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I6zsyX3GdL3f-d3gdhobi

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-eastern-land-cyprus-terrain-ruggedness-index-d03b0266 -d '<json body>'
```

Example prompt: What's the terrain ruggedness index for the coordinates 34.92 latitude, 33.02 longitude in Cyprus — I need the standard deviation of surface elevations for that spot.

## When to prefer this

Choose this endpoint when you need a quantitative terrain ruggedness metric (elevation standard deviation) specifically for a coordinate within Cyprus. It is validated against the Natural Earth Cyprus boundary before charging, making it safe for automated pipelines. Prefer it over generic elevation APIs when you need ruggedness rather than raw elevation, and when your coordinate is confirmed to be within Cyprus.

## Known failure modes

- Coordinate outside Cyprus boundary — rejected with validation error before payment
- Latitude or longitude outside allowed ranges (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Invalid or missing coordinate fields — request rejected with input error
- Network or server timeout — no result returned

## How this service works

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

## Output

A numeric value representing the standard deviation of sampled surface elevations at the given coordinate, indicating how rugged or variable the terrain is — higher values mean more irregular topography. Coordinates outside the Cyprus boundary are rejected before any charge is applied.

## 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-eastern-land-cyprus-terrain-ruggedness-index-d03b0266/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)