# HALOWERK Eastern Land – Hungary Terrain Ruggedness Index

> HALOWERK Eastern Land – Hungary 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 2026-09-13).

Returns the standard deviation of sampled surface elevations (terrain ruggedness index) for a given coordinate within Hungary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hu-ruggedness
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-eastern-land-hungary-terrain-ruggedness-index-3f99494d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cRyIhMqoqCEePMw0Wql4K

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-hungary-terrain-ruggedness-index-3f99494d -d '<json body>'
```

Example prompt: What's the terrain ruggedness index at latitude 47.5 and longitude 19.04 in Hungary? I need the standard deviation of surface elevations for that coordinate.

## When to prefer this

Use this endpoint when you need elevation variability or terrain ruggedness specifically for a point location within Hungary, particularly when boundary validation before billing is important. Prefer this over generic DEM or elevation APIs when you want a pre-computed ruggedness index (standard deviation of elevations) rather than raw elevation values, and when the Hungary-specific Natural Earth boundary validation is a useful safeguard.

## Known failure modes

- Coordinate outside Hungary boundary — rejected before payment with a validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Invalid or missing latitude/longitude fields — request rejected with input error
- Network or service timeout — no result returned
- Payment failure via x402 protocol — call not executed

## How this service works

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

## Output

A numeric terrain ruggedness index value representing the standard deviation of sampled surface elevations at the given coordinate. The coordinate is pre-validated against Hungary's Natural Earth boundary; requests outside Hungary 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-hungary-terrain-ruggedness-index-3f99494d/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)