# HALOWERK Baltic Land – Surface Elevation Ruggedness (Germany)

> HALOWERK Baltic Land – Surface Elevation Ruggedness (Germany) is a paid API for AI agents from baltikum.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 for a given coordinate within Germany, quantifying terrain ruggedness.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/de-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-baltic-land-surface-elevation-ruggedness-germany-f766d577
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TG0u5bD0JyIZ67yJxA4fT

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-baltic-land-surface-elevation-ruggedness-germany-f766d577 -d '<json body>'
```

Example prompt: What's the surface elevation ruggedness — specifically the standard deviation of sampled elevations — at latitude 51.5 and longitude 10.2 in Germany?

## When to prefer this

Choose this endpoint when you need a precise, point-based terrain ruggedness metric (elevation standard deviation) specifically for locations within Germany. It is ideal for land suitability analysis, infrastructure planning, environmental modeling, or any workflow that requires knowing how topographically variable a site is. Prefer it over broader European or global DEM APIs when you need Germany-validated results with coordinate boundary enforcement and per-call micropayment pricing.

## Known failure modes

- Coordinate outside Germany boundary: request rejected by Natural Earth validation before payment, returns an error indicating the location is out of coverage
- Latitude or longitude outside the accepted European bounding box (34–72.5°N, -31.5–40.5°E): schema validation failure
- Missing latitude or longitude parameter: request rejected with a validation error
- Network or service unavailability: may return a 5xx error

## How this service works

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

## Output

A numeric value representing the standard deviation of surface elevations sampled around the queried coordinate within Germany, indicating terrain ruggedness. Higher values indicate more uneven or hilly terrain; lower values indicate flatter terrain. Coordinates outside Germany are rejected before any charge is incurred.

## 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-baltic-land-surface-elevation-ruggedness-germany-f766d577/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)