# HALOWERK Baltic Land – Terrain Ruggedness Standard Deviation (Poland)

> HALOWERK Baltic Land – Terrain Ruggedness Standard Deviation (Poland) 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 Poland, quantifying local terrain ruggedness.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-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-terrain-ruggedness-standard-deviation-poland-3c8a0033
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OsmUZ2FYjLqB8PMu45zGC

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-terrain-ruggedness-standard-deviation-poland-3c8a0033 -d '<json body>'
```

Example prompt: What's the terrain ruggedness standard deviation at latitude 50.06 and longitude 19.94 in Poland? I need the elevation variability for that coordinate.

## When to prefer this

Choose this endpoint when you need a statistical measure of terrain heterogeneity (standard deviation of elevation samples) specifically for locations within Poland. It is distinct from range-based ruggedness (max–min elevation difference) and slope-gradient metrics available on the same platform. Prefer this for applications where variance-based roughness is needed, such as ecological modeling, infrastructure siting, or hydrological analysis within Poland.

## Known failure modes

- Coordinate outside Poland boundary: request is rejected before processing (validation failure, no charge)
- Coordinate outside overall European coverage range: rejected by input schema validation
- Missing latitude or longitude parameters: request fails with validation error
- Network or service unavailability: HTTP 5xx or timeout
- Payment failure via x402 protocol: request not processed

## How this service works

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

## Output

A numeric value representing the standard deviation of sampled surface elevation values within the analysis grid around the given coordinate. Higher values indicate more rugged, heterogeneous terrain; the coordinate is first validated to fall within Poland's Natural Earth boundary before the computation is returned.

## 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-terrain-ruggedness-standard-deviation-poland-3c8a0033/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)