# HALOWERK Baltic Land – Latvia Terrain Ruggedness (Surface Elevation Std Dev)

> HALOWERK Baltic Land – Latvia Terrain Ruggedness (Surface Elevation Std Dev) 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 (terrain ruggedness index) for a given WGS84 coordinate within Latvia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lv-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-latvia-terrain-ruggedness-surface-elevation-std-a1fb09dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__ZfBZoknnmhlSy1wIQHp1

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-latvia-terrain-ruggedness-surface-elevation-std-a1fb09dc -d '<json body>'
```

Example prompt: What's the terrain ruggedness at latitude 56.95, longitude 24.11 in Latvia — give me the standard deviation of surface elevations for that spot.

## When to prefer this

Use this endpoint when you need a quantitative terrain ruggedness metric (surface elevation standard deviation) specifically for a point within Latvia. It is ideal for geospatial analysis pipelines covering Latvian land surface characteristics, infrastructure siting, agricultural assessment, or environmental modeling where boundary validation against Natural Earth Latvia geometry is required before billing.

## Known failure modes

- Coordinate outside Latvia's Natural Earth boundary — request rejected, no charge
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — schema validation error
- Payment failure or insufficient USDC balance — transaction not processed

## How this service works

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

## Output

A numeric value representing the standard deviation of surface elevations sampled around the queried coordinate within Latvia, indicating terrain ruggedness. Coordinates outside Latvia's boundary as defined by the Natural Earth dataset 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-latvia-terrain-ruggedness-surface-elevation-std-a1fb09dc/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)