# HALOWERK Baltic Land – Lithuania Surface Ruggedness (Standard Deviation)

> HALOWERK Baltic Land – Lithuania Surface Ruggedness (Standard Deviation) 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 coordinate within Lithuania, quantifying terrain ruggedness.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lt-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-lithuania-surface-ruggedness-standard-deviation-47768faa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GLs5qLL_UYIwWGEgI_8EL

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-lithuania-surface-ruggedness-standard-deviation-47768faa -d '<json body>'
```

Example prompt: What's the terrain ruggedness — as a standard deviation of surface elevations — for the location at latitude 54.6872, longitude 25.2797 in Lithuania?

## When to prefer this

Use this endpoint when you need a quantitative ruggedness metric (elevation standard deviation) for a specific point within Lithuania. It is ideal for geospatial pipelines, land suitability assessments, or environmental analysis focused on the Lithuanian territory. Prefer this over generic elevation APIs when you need a pre-validated, Lithuania-scoped ruggedness statistic with pay-per-call pricing.

## Known failure modes

- Coordinate outside Lithuania boundary — rejected before payment, no charge incurred
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Missing required latitude or longitude parameters — request rejected
- Network timeout or service unavailability — retry recommended

## How this service works

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

## Output

A numeric value representing the standard deviation of sampled surface elevations at the requested coordinate within Lithuania, indicating terrain ruggedness. Coordinates outside the Lithuanian boundary are rejected before any payment is processed.

## 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-lithuania-surface-ruggedness-standard-deviation-47768faa/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)