# HALOWERK Central Land – Terrain Ruggedness Index (Czechia)

> HALOWERK Central Land – Terrain Ruggedness Index (Czechia) is a paid API for AI agents from mitteleuropa.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 within a local neighborhood around a coordinate in Czechia, quantifying terrain ruggedness.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/cz-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-central-land-terrain-ruggedness-index-czechia-2fd213b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aLghmESFLYym4xzcMbtyi

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-central-land-terrain-ruggedness-index-czechia-2fd213b5 -d '<json body>'
```

Example prompt: What's the terrain ruggedness at latitude 49.75, longitude 13.38 in Czechia — I need the standard deviation of surface elevations for that spot.

## When to prefer this

Choose this endpoint when you specifically need terrain ruggedness (elevation variability / standard deviation of elevations) for a point within Czechia. It is distinct from mean slope endpoints (which return gradient) and convexity endpoints (which return the difference between neighborhood mean and center elevation). Use it for land suitability analysis, ecological assessments, or route planning where surface irregularity matters most.

## Known failure modes

- Coordinate outside Czechia boundary: request rejected before payment with a validation error
- Latitude or longitude out of European coverage range (34–72.5°N, -31.5–40.5°E): rejected with schema validation error
- Invalid or missing coordinate fields: returns a 400-level error
- Temporary backend unavailability: may return 5xx error

## How this service works

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

## Output

A numeric value representing the standard deviation of surface elevations (in meters) sampled within a neighborhood around the given coordinate, reflecting local terrain ruggedness. Higher values indicate more rugged, hilly terrain; lower values indicate flat terrain. The coordinate must fall within the Czech Republic boundary or the request is rejected.

## 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-central-land-terrain-ruggedness-index-czechia-2fd213b5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)